Chandra X-Ray Observatory
	(CXC)

Cycle 1 Proposal Abstracts and Targets

Chandra proposals are divided into the following categories:

  1. SOLAR SYSTEM
  2. NORMAL STARS AND WD
  3. WD BINARIES AND CV
  4. BH AND NS BINARIES
  5. SN, SNR AND ISOLATED NS
  6. NORMAL GALAXIES
  7. ACTIVE GALAXIES AND QUASARS
  8. CLUSTERS OF GALAXIES
  9. EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS
  10. GALACTIC DIFFUSE EMISSION AND SURVEYS


***********************************************************************************
SOLAR SYSTEM                                      
--------------------------------------------------

===================================================================================

Proposal Number: 01100297            
Proposal Title: VENUS AND MARS: THE CLOSEST PLANETARY ANALOGUES TO COMETS

PI: KONRAD DENNERL                 
Subject Category: SOLAR SYSTEM                                      

Abstract: The recent discovery of unexpectedly bright X-ray emission from comets
has led to increased interest in X-ray studies of solar system objects. It has
demonstrated that even in our immediate astronomical environment surprises may be
waiting for being discovered. With their carbon and oxygen rich atmospheres and
the absence of strong magnetic fields, Venus and Mars represent the closest
planetary analogues to comets. Soft X-ray observations provide a sensitive tool
to study such atmospheres, in particular any outgassing effects. AXAF is the
first imaging X-ray satellite which is able to observe Venus, and Mars at
opposition, when it is closest to Earth.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 22:38:27.54  -09:27:51.30  VENUS                 ACIS-S LETG   6.00
 22:38:44.92  -09:25:42.02  VENUS                 ACIS-S LETG   6.00
 22:48:55.82  -08:09:31.72  VENUS                 ACIS-I NONE  12.30

===================================================================================

Proposal Number: 01100323            
Proposal Title: AXAF LOW ENERGY SPECTROSCOPY AND PHOTOMETRIC IMAGING OF COMETARY
X-RAY EMISSION FROM COMET P/TEMPEL 2

PI: CAREY LISSE                    
Subject Category: SOLAR SYSTEM                                      

Abstract: The discovery of x-ray emission from comets has produced a number of
questions about the physical mechanism producing the radiation. There are now a
variety of explanations for the emission, from thermal bremsstrahlung of
electrons off neutrals or dust, to charge exchange induced emission from solar
wind ions, to reconnection of solar magnetic field lines. In an effort to
understand this new phenomenon, we propose spectroscopic and imaging photometric
observations with the AXAF ACIS-S of periodic comet P/Tempel 2 during its close
approach to Earth in 1999. Our scientific goal is to determine the mechanism(s)
responsible for the observed x-rays by producing detailed low energy spectra,
high spatial resolution images, hardness maps of the emission.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:22:16.99  +60:18:20.66  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:22:40.07  +60:20:17.66  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:23:03.23  +60:22:14.74  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:23:26.45  +60:24:11.92  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:23:49.73  +60:26:09.20  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:24:14.01  +60:28:11.24  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:24:37.42  +60:30:08.68  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:25:00.89  +60:32:06.22  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:41:04.18  +61:39:55.73  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:41:32.79  +61:41:33.54  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:42:01.54  +61:43:11.64  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:42:30.41  +61:44:49.85  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:43:00.56  +61:46:32.09  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:43:29.66  +61:48:10.55  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:43:58.90  +61:49:49.12  LINEAR 1999 S4        ACIS-S NONE   1.00
 04:44:28.25  +61:51:27.79  LINEAR 1999 S4        ACIS-S NONE   1.00
 12:09:51.56  +10:48:36.90  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:09:56.16  +10:45:54.54  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:10:00.95  +10:43:10.09  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:10:05.73  +10:40:31.12  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:10:10.52  +10:37:50.02  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:10:15.30  +10:35:09.31  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:10:20.07  +10:32:29.00  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:10:24.84  +10:29:49.09  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:10:29.61  +10:27:09.58  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:10:34.38  +10:24:30.49  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:10:39.15  +10:21:51.80  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:10:43.91  +10:19:13.51  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:10:48.67  +10:16:35.65  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:10:53.43  +10:13:58.15  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:10:58.20  +10:11:21.08  Comet c/LINEAR 1999   ACIS-S NONE   1.00
 12:11:02.96  +10:08:44.41  Comet c/LINEAR 1999   ACIS-S NONE   1.00

===================================================================================

Proposal Number: 01100334            
Proposal Title: X-RAY IMAGING OF THE INTERACTING WINDS OF PLANETARY NEBULAE

PI: JOEL KASTNER                   
Subject Category: SOLAR SYSTEM                                      

Abstract: Certain planetary nebulae (PNe) are X-ray sources. Although this
emission is generally ascribed to central stars, PNe also should display hot (>
10^6 K), diffuse X-ray emission, according to the "interacting winds" model of PN
evolution. With the unprecedented combination of spatial and spectral resolution
afforded by AXAF/ACIS we will, for the first time, distinguish unambiguously
between diffuse, nebular X-ray emission and emission from the central star. We
propose to observe 4 PNe that, based on previous ROSAT and ASCA results, are
likely to display extended, high-temperature X-ray emission in ACIS images and
spectra. These data will provide constraints on PN X-ray emission models and on
the excitation of H_2 emission from PNe.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 19:34:45.20  +30:30:59.10  BD+303639             ACIS-S NONE  20.00
 21:07:01.60  +42:14:09.70  NGC 7027              ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01100814            
Proposal Title: ASSESSEMENT OF INTERSTELLAR DEPLETIONS THROUGH X-RAY ABSORPTION
AND SCATTERING BY DUST

PI: THEODORE SNOW                  
Subject Category: SOLAR SYSTEM                                      

Abstract: We propose to obtain AXAF/LETGS spectra of K- and L-shell absorption
edges and scattering halos due to dust along the line of sight to X Persei. These
data, along with our existing HST/GHRS results on gas in the same line of sight,
will provide direct information on grain composition and sizes. The combination
of AXAF and HST data will provide new insights into depletions (independent of
any assume "cosmic" abundances), and will provide important new constraints on
models for the dust as well as the relationship between stellar and ISM
compositions. X Per is a reddened power-law source with a steep high-energy
cut-off, making it an ideal candidate (with minimal confusion due to high
spectral orders), with sufficient flux to achieve S/N of about 25 in 50 ksec.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:55:23.00  +31:02:45.00  X PERSEI (HD 24534)   HRC-S  LETG  50.00

===================================================================================

Proposal Number: 01100890            
Proposal Title: SOLVING THE PUZZLE OF COMETARY X-RAY ORIGIN: OBSERVATIONS OF
COMET 10P/TEMPEL 2

PI: W. THOMAS VESTRAND             
Subject Category: SOLAR SYSTEM                                      

Abstract: The unprecedented spectroscopic and imaging capabilities of AXAF are
well suited to solving the puzzle of cometary x-ray origin. In addition, the
heliocentric and geocentric distance of Comet 10P/Tempel 2 in August 1999 will
make it an ideal subject for x-ray study. We therefore propose a 50 ksec
observation of Tempel 2 with HRC-S/LETG that will allow us to test unambiguously
the spectral predictions of the leading models for generation of cometary x-rays.
We also request a 25 ksec imaging observation with HRC-I to determine the
morphology of the cometary emission. These observations, in conjunction with our
campaign of multiwavelength observations, will allow us to test all the proposed
models for cometary x-ray emission.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 23:04:19.25  +09:24:12.28  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:04:36.09  +09:21:51.23  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:04:54.76  +09:19:15.06  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:05:11.50  +09:16:55.06  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:05:28.18  +09:14:35.70  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:05:44.81  +09:12:17.03  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:06:03.21  +09:09:43.85  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:06:21.52  +09:07:11.75  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:06:37.92  +09:04:55.96  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:06:54.25  +09:02:41.35  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:14:05.44  +08:07:32.31  LINEAR 2001 A2        HRC-I  NONE   2.25
 23:14:25.79  +08:04:41.19  LINEAR 2001 A2        HRC-I  NONE   2.25
 23:14:45.50  +08:01:54.79  LINEAR 2001 A2        HRC-I  NONE   2.25
 23:15:04.72  +07:59:11.92  LINEAR 2001 A2        HRC-I  NONE   2.25
 23:15:24.55  +07:56:23.22  LINEAR 2001 A2        HRC-I  NONE   2.25
 23:16:15.60  +07:49:06.60  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:16:35.43  +07:46:16.11  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:16:55.59  +07:43:22.36  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:17:15.71  +07:40:28.52  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:17:35.79  +07:37:34.58  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:17:55.69  +07:34:41.82  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:18:14.54  +07:31:57.83  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:18:33.80  +07:29:10.00  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:18:53.25  +07:26:20.22  LINEAR 2001 A2        HRC-S  LETG   2.25
 23:19:43.35  +07:19:01.41  LINEAR 2001 A2        HRC-I  NONE   2.25
 23:20:02.26  +07:16:15.30  LINEAR 2001 A2        HRC-I  NONE   2.25
 23:20:21.36  +07:13:27.28  LINEAR 2001 A2        HRC-I  NONE   2.25
 23:20:40.64  +07:10:37.35  LINEAR 2001 A2        HRC-I  NONE   2.25
 23:20:59.47  +07:07:51.20  LINEAR 2001 A2        HRC-I  NONE   2.25

===================================================================================

Proposal Number: 01100931            
Proposal Title: X-RAY AFTERGLOW MEASUREMENTS BY AXAF OF GAMMA-RAY BURSTS
LOCALIZED BY THE RXTE/ASM AND HETE SATELLITES

PI: GEORGE RICKER                  
Subject Category: SOLAR SYSTEM                                      

Abstract: AXAF imaging and spectroscopic TOO observations of six (6) gamma-ray
burst afterglow sources are proposed. Initial source localizations will be
provided by the RXTE/ASM and HETE satellites, supplemented by IPN measurements.
AXAF measurements will not only provide arc-second refinements of source
localizations, but will accurately measure afterglow decay and spectra,
permitting stringent tests of a variety of shock wave geometries and sequelae.
The observing team will immediately place all AXAF positions, intensities, and
spectroscopic parameters into the public domain via the GCN. Prompt optical
(photometric and spectroscopic) and radio followup will also be provided by the
proposing team.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
                            GRB/TOO #1            ACIS-I NONE  10.00
                            GRB/TOO #2            ACIS-I NONE  10.00

===================================================================================

Proposal Number: 01100952            
Proposal Title: X-RAY POSITIONS AND AFTERGLOWS OF GAMMA-RAY BURSTS

PI: LUIGI PIRO                     
Subject Category: SOLAR SYSTEM                                      

Abstract: BeppoSAX recently discovered X-ray transients associated with gamma-ray
bursts (GRBs), leading to reliable identification of the GRB hosts and
astrophysical constraints of the evolution of GRB events. Fundamental advances in
understanding GRBs can be achieved with the arcsecond positions, high sensitivity
and spectral calpabilities of AXAF/ACIS. Our TOO program will permit: (1) fast
counterpart identification at other wavelengths; (2) study of the afterglow
spectrum and evolution in both the early (days) and late (months) phases; and (3)
possible detection of X-ray line features. We propose to study 6 bursts localized
by BeppoSAX or RXTE, selecting two of the brightest for detailed multiepoch
spectral study.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
                            GRB #3                ACIS-S HETG  10.00
 01:59:14.81  -40:40:09.84  GRB000210             ACIS-S NONE  10.00
 05:09:31.20  +11:17:06.00  GRB 991216            ACIS-S HETG  10.00
 17:04:09.70  +51:47:11.00  GRB000926             ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01100045            
Proposal Title: ACIS OBSERVATION OF JUPITER AND THE GALILEAN SATELLITES

PI: GORDON GARMIRE                 
Subject Category: SOLAR SYSTEM                                      

Abstract: Auroral phenomena in Jupiter are diagnostic of the structure, processes
and energetics of its magnetosphere. Past X-ray observations have revealed
latitudinal and longitudinal asymmetries, with spectra consistent with a model of
sulfur and oxygen ions precipitating onto the Jovian atmosphere. This observation
will provide a clear image of the X-ray emission during a full Jovian rotational
period with spectral resolution sufficient to detect the expected emission
linesif ion precipitations powers the X-ray aurora. Galilean moons immersed in
the magnetosphere may emit X-rays due to particle bombardment, auroral activity
or other process.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 01:38:49.79  +08:43:13.66  JUPITER               ACIS-S NONE  20.15
 01:38:54.31  +08:43:35.69  JUPITER               ACIS-S NONE  20.15

===================================================================================

Proposal Number: 01108023            
Proposal Title: X-RAY EMISSION FROM COMET 10P/BORRELLY DURING THE DEEP SPACE 1
ENCOUNTER

PI: KONRAD DENNERL                 
Subject Category: SOLAR SYSTEM                                      

Abstract: X-ray emission from comets is now a well established phenomenon. During
the last years a lot of evidence has emerged that the dominant mechanism is
charge exchange between heavy solar wind ions and cometary neutrals. The recent
Chandra ACIS-S observation of Comet C/1999 S4 (LINEAR) has provided the final
proof. Measurements of solar wind parameters, however, have never been made
sufficiently near to a comet to allow a direct comparison with the X-ray flux.
The recent decision of NASA to extend the Deep Space 1 mission for a rendezvous
with comet 19P/Borrelly in Sept 2001 opens, for the first time ever, the unique
opportunity to combine in-situ measurements of the solar wind properties at a
comet with simultaneous X-ray observations. This RfO is submitted as a request
for DDT since the dec

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 07:54:11.23  +20:45:39.20  COMET 19P/BORRELLY    ACIS-S NONE   9.00
 07:54:11.23  +20:45:39.20  COMET 19P/BORRELLY    ACIS-S NONE   9.00
 07:54:11.23  +20:45:39.20  COMET 19P/BORRELLY    ACIS-S NONE   9.00
 07:54:11.23  +20:45:39.20  COMET 19P/BORRELLY    ACIS-S NONE   9.00



***********************************************************************************
NORMAL STARS AND WD                               
--------------------------------------------------

===================================================================================

Proposal Number: 01200248            
Proposal Title: ACIS/HETG SPECTROSCOPY OF THE ACTIVE BINARIES ALGOL & UX ARI

PI: STEPHEN DRAKE                  
Subject Category: NORMAL STARS AND WD                               

Abstract: Previous low- and moderate-resolution X-ray spectroscopy of active
binary stars have yielded surprising results concerning the abundances of the
elements in these coronal plasmas, viz., that, in almost every well-studied case,
a solar photospheric abundance plasma model cannot fit the observed spectrum:
e.g., in some stars, Fe abundances of 10% of the solar value have been inferred.
To verify and extend these findings, we propose to observe with the HETG two of
the best-studied such stars, Algol and UX Ari. We will study the detailed
structure of the He-like multiplets of the abundant elements O, Ne, Mg, Si, S,
Ar, Ca, and Fe, and rederive their abundances, and also search for anomalous line
ratios due to effects such as high resonance-line opacity and/or high electron
densities.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:08:10.10  +40:57:20.40  ALGOL                 ACIS-S HETG  50.00
 03:26:35.40  +28:42:54.50  UX ARI                ACIS-S HETG  50.00

===================================================================================

Proposal Number: 01200260            
Proposal Title: THE FULL T TAURI STAR POPULATION OF THE YOUNG STELLAR CLUSTER IC
348

PI: THOMAS PREIBISCH               
Subject Category: NORMAL STARS AND WD                               

Abstract: We propose to obtain a 50 ksec ACIS-I observation of the young stellar
cluster IC 348. The high sensitivity and spatial resolution of AXAF/ACIS will
allow us, for the first time, to detect X-ray emission from the numerous faint T
Tauri stars in IC 348. This will enable us to identify the {\bf full} population
of T Tauri stars in IC 348, i.e.~down to stellar masses of $0.1\,M_\odot$, by
their X-ray emission. Furthermore, this observation will provide us with X-ray
spectra and lightcurves for a large $(\ge 200)$ and homogeneous sample of T Tauri
stars.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:44:30.00  +32:07:60.00  IC 348                ACIS-I NONE  50.00

===================================================================================

Proposal Number: 01200272            
Proposal Title: DIRECT HRC-I IMAGING OF THE COLLIDING WINDS SHOCK IN WR 147

PI: JULIAN PITTARD                 
Subject Category: NORMAL STARS AND WD                               

Abstract: Colliding stellar winds in early-type binary systems produce a complex
region of shock-heated plasma with temperatures in excess of 10^7 K, with the
strongest X-ray emission from systems containing Wolf-Rayet (WR) stars. Only in
X-rays do we directly see the shocked gas from the wind collision. Recent high
spatial resolution radio observations of WR 147 have revealed two sources 0.6"
apart, which are believed to be the WR-star and the wind collision shock, both of
which will be X-ray sources. These two sources will be resolvable in a 5ksec
observation with the HRC-I. This observation will provide the first direct
imaging of hot shocked gas in an early-type binary, unambiguously verifying that
the enhanced X-ray emission in early-type binaries is due to a colliding winds
shock.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 20:36:43.50  +40:21:08.00  WR 147                HRC-I  NONE   5.00

===================================================================================

Proposal Number: 01200299            
Proposal Title: PHOTOSPHERIC METAL ABUNDANCES IN THE VERY HOT, HYDROGEN-RICH
CENTRAL STARS OF THE PLANETARY NEBULAE NGC1360 AND NGC6853

PI: Thomas Rauch                   
Subject Category: NORMAL STARS AND WD                               

Abstract: We propose the spectroscopic observation of the very hot, hydrogen-rich
central stars of the planetary nebulae NGC 1360 and NGC 6853. These are the
brightest of four objects of this spectral subtype which were detected in the
EUVE all-sky survey. Both were detected also by ROSAT. The high-resolution AXAF
spectra will be analyzed together with high-resolution high-S/N optical,
ultraviolet (IUE), extreme ultraviolet(EUVE), and X-ray (ROSAT) data by means of
fully metal-line blanketed NLTE model atmospheres. Principal aim of the AXAF
observations is the first comprehensive determination of light metal (Li - Ca)
abundances as well as of iron group element abundances in central stars of
planetary nebulae.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:33:14.65  -25:52:17.98  NGC 1360              HRC-S  LETG 100.00

===================================================================================

Proposal Number: 01200353            
Proposal Title: CORONAL STRUCTURE OF THE LONG-PERIOD BINARY: LAMBDA AND

PI: ANDREA DUPREE                  
Subject Category: NORMAL STARS AND WD                               

Abstract: AXAF/HETG spectra of the RS CVn binary, Lambda And, will probe the
temperature and density of an unusually hot corona, whose structure has been
outlined through extreme ultraviolet and X-ray studies. Lambda And provides an
important link for understanding the activity/rotation relation, showing evidence
in the photosphere for both high latitude and equatorial spots. The proposed AXAF
grating observation will quantify the coronal emission measure distribution over
the full temperature range, electron densities for at least two distinct
temperatures, and elemental abundances needed to calculate radiative losses.
Coronal abundances from high and low First Ionization Potential will be measured
and compared with well known photospheric abundances.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 23:37:33.80  +46:27:29.30  LAMBDA AND            ACIS-S HETG 100.00

===================================================================================

Proposal Number: 01200366            
Proposal Title: MEASURING DOPPLER SHIFTS OF X-RAY LINES TO DETERMINE THE STELLAR
WIND X-RAY LOCATIONS IN OB STARS

PI: WAYNE WALDRON                  
Subject Category: NORMAL STARS AND WD                               

Abstract: For almost 20 years we have been trying to determine the source of the
X-ray emission in OB stars. It is generally believed that this emission is caused
by a distribution of stellar wind shocks. The AXAF grating spectrometers will
provide the ultimate test of X-ray models. The shock model predicts that X-ray
lines must be Doppler blue-shifted, hence, our primary objective is to measure
these blue-shifts. MARX simulations show that the expected X-ray line shifts will
be at least 4 times the MEG1 energy resolution limit. ASCA observations have
provided stronger constraints on X-ray models, but they have also raised
additional questions (e.g., X-ray abundance anomalies). The large number of X-ray
lines predicted by MARX simulations will allow us to probe X-ray densities and
abundances.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:40:45.50  -01:56:34.00  ZETA ORI              ACIS-S HETG  60.00

===================================================================================

Proposal Number: 01200367            
Proposal Title: EXTENDED X-RAY EMISSION FROM MASSIVE STAR FORMATION REGIONS

PI: EDWARD CHURCHWELL              
Subject Category: NORMAL STARS AND WD                               

Abstract: We propose to obtain images and spectra for the massive star formation
regions (MSFRs) W3, G5.89, and G34.26 using the ACIS-I detector on AXAF. Our
goals are to determine how common X-ray emission is from MSFRs and if the
emission is generally extended and as hard as that observed toward W3. Further,
we wish to use the high spatial resolution of AXAF to resolve the individual UC
HII regions in the W3 complex. Observations of G5.89 and G34.26 will address the
issues of how common extended, hard X-ray emission is from MSFRs, determine if
FeXXV line emission is common and possibly strong enough to account for a
significant fraction of the FeXXV disk emission from the Galaxy.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:25:38.10  +62:05:52.50  W3B                   ACIS-I NONE  18.50
 02:25:38.10  +62:05:52.50  W3B                   ACIS-I NONE  21.50

===================================================================================

Proposal Number: 01200382            
Proposal Title: THE SOURCE OF X-RAYS IN THE HR 1442 SYSTEM

PI: FREDERICK WALTER               
Subject Category: NORMAL STARS AND WD                               

Abstract: HR 1442 is a pair of B9 IV stars associated with the Taurus star
formation region. It is also one of the brightest X-ray sources in this star
formation region. ROSAT HRI observations could not resolve the pair. Ground based
observations shows that one of the B stars has an infrared excess, a lithium
absorption line, and may have a circumstellar disk. There is also a fainter
IR-bright star nearby. We propose an HRC-I imaging observation to resolve the
source(s) of the X-rays in this system. This will assist in elucidating the
nature of the peculiar B star.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:33:32.70  +18:01:00.00  HR 1442               HRC-I  NONE   5.00

===================================================================================

Proposal Number: 01200472            
Proposal Title: FLUORESCENCE AND OPTICAL DEPTH: NEW PROBES OF CORONAL GEOMETRY

PI: JEREMY DRAKE                   
Subject Category: NORMAL STARS AND WD                               

Abstract: Our proposed 100ks LETG+ACIS-S observation of the X-ray bright active
star sigma Gem will yield a wealth of X-ray plasma line diagnostics that will
give us a giant leap forward in our understanding of its coronal densities,
abundance anomalies and emission measure distribution. Unfortunately, there is
one very basic unanswered question in the physics of active stellar coronae that
the usual plasma diagnostics cannot address directly: What are the spatial
characteristics of stellar coronae---the scale height and filling factor? What do
other stellar coronae actually look like? We will provide the first direct
spectroscopic answers to this question through two novel diagnostics of coronal
geometry: photospheric fluorescence and resonance line optical depths.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 07:43:18.40  +28:53:12.10  SIGMA GEM             ACIS-S LETG 100.00

===================================================================================

Proposal Number: 01200475            
Proposal Title: FK COM: SHROUDED IN MYSTERY

PI: DEREK BUZASI                   
Subject Category: NORMAL STARS AND WD                               

Abstract: FK Com is a single G-type giant rotating near the breakup velocity
which is considered to be a recently coalesced binary. While generally displaying
extreme levels of activity, FK Com is highly variable and surprisingly
underluminous at X-ray wavelengths. This observed deficiency may be due either to
obscuring material around the star, or to a dynamo mechanism which differs from
that operating in other cool stars. We propose to observe FK Com and two similar
stars, HD 199178 and LW Hya, to address this issue and others, such as the
contribution of flaring to the observed X-ray luminosity and the question of
whether or not the corona is corotating. In the case of LW Hya, we propose to use
ACIS-I for a quick first look, while we will use HETG for an in-depth study of FK
Com and HD 199178.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:30:46.90  +24:13:58.90  FK COM/HD 117555      ACIS-S HETG  40.00

===================================================================================

Proposal Number: 01200495            
Proposal Title: X-RAY EMISSION AT THE BOTTOM OF THE MAIN SEQUENCE

PI: THOMAS FLEMING                 
Subject Category: NORMAL STARS AND WD                               

Abstract: We propose to obtain AXAF ACIS-S-BI images of a sample of low mass
stars and brown dwarfs. Until now, the lowest-mass dwarf detected in X-rays had
been VB 8. Given the improved sensitivity of AXAF over previous missions, we are
confident that coronal X-ray emission can now be detected in the very lowest mass
stars and substellar objects known. Therefore, the objective of this proposal is
to make such detections and thereby establish the existence of magnetic activity
at the very bottom of the main sequence and beyond. Our target list includes the
brown dwarfs Kelu-1 and BRI 0021-0214 along with the very low mass stars LHS 2924
and VB 10. We also request a short ACIS-S-BI image of the known X-ray source VB 8
as a prelude to future AXAF LETG observations.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:55:35.40  -08:23:39.90  VB 8                  ACIS-S NONE   9.00
 19:16:57.10  +05:09:04.90  VB 10                 ACIS-S NONE  13.00

===================================================================================

Proposal Number: 01200572            
Proposal Title: X-RAYS FROM THE RHO OPHIUCHI YOUNG STAR CLUSTER

PI: THIERRY MONTMERLE              
Subject Category: NORMAL STARS AND WD                               

Abstract: The rho Ophiuchi cloud is one of the richest and nearest star forming
regions with hundreds of young stellar objects (YSOs) representing all stages of
early stellar evolution. It is a superb laboratory for the study of X-ray
emission from YSOs with extensive multiwavelength data. AXAF observations will
lead to insights concerning the dispersal of circumstellar disks, the impact of
ionizing radiation and particles on disks, and the evolution of X-ray emission.
We propose a mosaic of ACIS fields covering one square degree, designed to give a
uniform sensitivity despite large changes in cloud extinction.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:25:31.70  -24:25:03.00  OPHIUCHI MOSAIC #1    ACIS-I NONE   5.00
 16:26:29.90  -24:32:33.00  OPHIUCHI MOSAIC #2    ACIS-I NONE   5.00
 16:26:29.90  -24:17:33.00  OPHIUCHI MOSAIC #4    ACIS-I NONE   5.00
 16:27:28.00  -24:10:03.00  OPHIUCHI MOSAIC #8    ACIS-I NONE   5.00
 16:28:26.20  -24:47:33.00  OPHIUCHI MOSAIC #9    ACIS-I NONE   5.00
 16:28:26.20  -24:32:33.00  OPHIUCHI MOSAIC #10   ACIS-I NONE   5.00
 16:28:26.20  -24:17:33.00  OPHIUCHI MOSAIC #11   ACIS-I NONE   5.00

===================================================================================

Proposal Number: 01200574            
Proposal Title: THE END OF STELLAR CORONAE?

PI: Gibor Basri                    
Subject Category: NORMAL STARS AND WD                               

Abstract: Almost all stars are X-ray emitters. Convective stars are thought to
have analogs of the solar corona, caused by magnetic activity which in turn is
produced by a dynamo. There are reasons to believe that the dynamo and coronal
heating could change character near the bottom of the main sequence. We get to
the heart of this by going to the very bottom of the main sequence, and below to
the brown dwarf regime. We test 2 of the nearest known such objects to see if
they lie beyond the end of the realm of stellar coronae.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:39:34.70  -35:25:50.00  LP 944-20             ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01200585            
Proposal Title: LETG OBSERVATION OF THE HOT WHITE DWARF GD 246

PI: JEAN DUPUIS                    
Subject Category: NORMAL STARS AND WD                               

Abstract: We propose an observation of the bright hot white dwarf GD 246 with the
Low Energy Transmission Grating. Our goal is to make use of the high spectral
resolution offered by the LETG to unambiguously identify the chemical elements
responsible for the short wavelength opacity in GD 246.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 23:12:21.40  +10:47:05.00  GD 246                HRC-S  LETG  40.00

===================================================================================

Proposal Number: 01200256            
Proposal Title: A COMPREHENSIVE INVESTIGATION OF X-RAY EMISSION FROM
INTERMEDIATE MASS STARS

PI: JEFFREY LINSKY                 
Subject Category: NORMAL STARS AND WD                               

Abstract: Although X-rays have been detected from essentially all types of stars,
one portion of the X-ray H-R Diagram remains an enigma. Despite large surveys
using Einstein and ROSAT, it is still not clear whether or not main sequence
stars of intermediate mass (spectral types B3--A7) are intrinsic X-ray sources.
Stars cooler than spectral type F0 are coronal X-ray sources and O3--B3 stars are
wind X-ray sources, but are the intermediate mass stars intrinsic X-ray sources
and how are they heated? We will exploit AXAF's three unique properties (high
resolution imaging, high energy resolution, and high sensitivity detectors with
very low background) to determine whether or not the intermediate mass stars are
intrinsic X-ray sources and to study the nature of the X-ray emitting plasma.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:06:16.70  -48:27:47.80  HD 113703             ACIS-S NONE  12.50
 14:45:57.64  -44:52:03.01  HD 129791             ACIS-S NONE   6.90
 15:17:30.85  -58:48:04.30  HD 135379             ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01200603            
Proposal Title: X-RAY EMISSION FROM WOLF-RAYET STARS: THE COLLIDING WIND SHOCK
SYSTEM GAMMA VELORUM

PI: STEPHEN SKINNER                
Subject Category: NORMAL STARS AND WD                               

Abstract: The powerful winds of Wolf-Rayet (WR) stars generate strong X-rays via
shock processes and also serve as an important source of chemical enrichment of
the interstellar medium. We propose to obtain a high resolution X-ray spectrum of
the colliding wind shock binary system Gamma Velorum (WC8 + O8), containing the
closest WR star known. The spectrum will be rich in emission lines, providing
information on mass loss parameters and shock geometry as well as metal
abundances that can be used to test evolutionary models of massive stars.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:09:32.00  -47:20:12.10  HD 68273              ACIS-S HETG  65.00

===================================================================================

Proposal Number: 01200619            
Proposal Title: SHOCKED STELLAR WINDS IN PLANETARY NEBULAE

PI: YOU-HUA CHU                    
Subject Category: NORMAL STARS AND WD                               

Abstract: Planetary nebulae (PNe) are expected to contain two types of X-ray
sources: a hot central star with temperature between 100,000 and 200,000 K, and a
shocked fast stellar wind at temperatures between 10$^6$ and 10$^8$ K. The
shocked fast wind, if detected, allows us to peer into the PN interior and
determine its physical conditions directly. We request ACIS-S observations of NGC
6543 (Cat's Eye Nebula) and NGC 7293 (Helix Nebula) in order to search for and
analyze their shocked fast winds. NGC 6543 is the only PN for which diffuse X-ray
emission has been previously reported and can be detected by the AXAF. NGC 7293
is the nearest PN, and hence provides the most promising case for which the hard
and soft X-ray components may be spatially resolved and distinguished.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:58:33.30  +66:37:59.20  NGC 6543              ACIS-S NONE  50.00
 22:29:38.50  -20:50:18.00  NGC 7293              ACIS-S NONE  12.00
 22:29:38.50  -20:50:18.00  NGC 7293              ACIS-S NONE  38.00

===================================================================================

Proposal Number: 01200684            
Proposal Title: RESOLVING THE X-RAY SPECTRUM OF THE EXTREMELY MASSIVE,
SUPERLUMINOUS STAR ETA CARINAE WITH AXAF

PI: MICHAEL CORCORAN               
Subject Category: NORMAL STARS AND WD                               

Abstract: Eta Car may be the most massive and luminous star in the Galaxy
(Davidson and Humphreys 1997). It has remained a mystery shrouded behind a thick
massive cloud of ejecta. X-ray emission is both a probe through this curtain and
a probe of this curtain. AXAF grating spectroscopy will help us make the next
leap forward by addressing currently unresolved questions about the velocity
field near the star, the stellar abundances and possible abundance gradients in
the circumstellar ejecta, the processes of line excitation, and the nature of the
hard X-ray emission and the nature of the star (or stars).

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:45:02.00  -59:40:49.00  ETA CAR               ACIS-S HETG 100.00

===================================================================================

Proposal Number: 01200687            
Proposal Title: X-RAY PROPERTIES OF VERY MASSIVE STARS WITH VERYDIFFERENT
METALLICITIES:THE ``STARBURSTS'' NGC 3603 AND NGC 346

PI: MICHAEL CORCORAN               
Subject Category: NORMAL STARS AND WD                               

Abstract: We propose to use ACIS-I to image the centers of the starburst
analogues NGC 3603 in the Galaxy and NGC 346 in the SMC. This study will enable
us to definitively determine the effects of abundance on X-ray emission, will
provide X-ray luminosities for nearly 100 stars, will provide X-ray spectra for
dozens of massive stars, and will enable us to examine the nature of diffuse
emission and SNR on the local ISM.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:15:07.20  -61:15:35.20  NGC 3603              ACIS-I NONE  50.00

===================================================================================

Proposal Number: 01200704            
Proposal Title: HARD X-RAY SEARCH FROM CLASS 0 PROTOSTARS

PI: KATSUJI KOYAMA                 
Subject Category: NORMAL STARS AND WD                               

Abstract: We propose to observe the Orion Molecular Clouds, OMC 2 and OMC 3, with
the ACIS-I instrument. With ASCA, these regions are found to exhibit hard X-ray
emissions, possiblly from embedded Class 0 and Class I protostars. Our goal is to
investigate; (1) when a star begins to emit X-rays, (2) what is the difference in
X-rays (spectrum and time variability) between Class 0 and Class I, and the other
phases of star formation (ClassII, III), and (3) what is the X-ray emission
mechanism in the protostar phase.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:35:19.98  -05:05:29.80  OMC2--3               ACIS-I NONE 100.00

===================================================================================

Proposal Number: 01200705            
Proposal Title: RESOLVING EMBEDDED X-RAY OBJECTS IN RHO OPH CLOUD CORE

PI: KATSUJI KOYAMA                 
Subject Category: NORMAL STARS AND WD                               

Abstract: With the ASCA observations of the Rho Oph dark cloud, we found variable
hard X-ray emission from Class I sources. A Class I (EL29) shows a flare like
TTSs, other (WL6) varies sinusoidally, suggesting rotation period, and the other
(YLW15) exhibit quasi-periodic flares, suggestive for the star-disk magnetic
connection. Non X-ray emitting Class I is also found. Our proposal is, with no
source confusion problem, to confirm these variety of X-ray activity, to search
for X-rays from other Class Is, as well as new X-ray emitting young stellar
objects, using ACIS with the high spatial resolution up to 10 keV energy.
Together with the radio search of bipolar structure, and comparison of TTSs, our
goal is to give strong constrain on the evolution and structure of protostars.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:27:17.18  -24:34:39.00  RHO OPH CORE          ACIS-I NONE 100.00

===================================================================================

Proposal Number: 01200720            
Proposal Title: CORONAL SPECTROSCOPY OF THE F0 SUPERGIANT CANOPUS: PROPERTIES OF
INTERMEDIATE MASS STAR CORONAE AFTER THE HE FLASH

PI: ALEXANDER BROWN                
Subject Category: NORMAL STARS AND WD                               

Abstract: Canopus (F0 Ib), the nearest (96 pc) supergiant, is a He-burning,
post-red supergiant star that recently redeveloped a 20 million K corona and
powers this corona at log Lx = 29.8 erg/s despite having a very thin convection
zone. The coronae of Canopus and similar stars are remarkably constant,
suggesting that while, the magnetic loops are efficiently heated, there is little
interaction between the loops. Canopus is the brightest late-type supergiant in
X-rays. We propose a 100 ksec HETG observation to measure the detailed coronal
temperature and EM distributions for this unusual type of corona. Coronal
abundances and densities will be estimated. In conjunction with HST/STIS spectra,
we will investigate the coronal energy balance and heating mechanisms, and
magnetic loop properties.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 06:23:57.10  -52:41:44.40  HD 45348              ACIS-S HETG 100.00

===================================================================================

Proposal Number: 01200767            
Proposal Title: ACIS IMAGING SPECTROSCOPY OF THE RHO OPHIUCHUS A CLOUD

PI: MARC GAGNE                     
Subject Category: NORMAL STARS AND WD                               

Abstract: Einstein, ROSAT and ASCA observations of the rho Ophiuchus star-forming
region have revealed X-ray flares, very hot plasma, and quasi-periodic
variability from embedded young stellar objects, suggesting that some of the
X-rays are produced by interactions between an accretion disk and large-scale
magnetic fields. We propose to obtain a 100-ks ACIS-I exposure of rho Oph A in
order to model X-ray spectra and light curves of YSOs spanning a wide range of
masses and accretion rates. These include the magnetic B3 star S1, 2 Herbig Ae/Be
stars, 2 class I protostars, 8 classical T Tauri stars, 3 weak-lined T Tauri
stars, along with 40-50 new X-ray sources. AXAF's spatial resolution and
effective area will allow us to model X-ray spectra of embedded sources not
attainable with ROSAT or ASCA.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:26:34.20  -24:23:27.80  RHO OPH A             ACIS-I NONE 100.00

===================================================================================

Proposal Number: 01200878            
Proposal Title: ARE B STAR X-RAY SOURCES WIND-CORONAL HYBRIDS?

PI: DAVID COHEN                    
Subject Category: NORMAL STARS AND WD                               

Abstract: We propose to use the high spectral resolution of both the LETG and
HETG to address several outstanding questions regarding X-ray production in B
stars, including: Are coronal and wind mechanisms operating together in some B
stars? Does the chaotic wind of tau Sco produce significant non-thermal emission
? What is the ionization balance in the stellar winds and how are X-rays
reprocessed in the ambient wind? These questions can be addressed directly thanks
to the ability afforded by AXAF to apply spectral diagnostic techniques used in
the laboratory to X-ray astrophysics. These diagnostics include (1) line profile
analysis, (2) density-sensitive line ratios, (3) continuum analysis, (4)
temperature-sensitive line ratios, and (5) inner-shell emission and absorption.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:35:52.90  -28:12:56.50  TAU SCO               ACIS-S HETG  15.00
 16:35:52.90  -28:12:56.50  TAU SCO               ACIS-S HETG  65.00

===================================================================================

Proposal Number: 01200893            
Proposal Title: HIGH-RESOLUTION SPECTRAL DIAGNOSTICS OF O-STAR X-RAY SOURCES

PI: JOSEPH CASSINELLI              
Subject Category: NORMAL STARS AND WD                               

Abstract: In the case of the fast O-star winds, the spectrometers on AXAF will
provide for the first time the spectral resolution needed to derive velocities of
the X-ray emitting material, significant constraints on the location of the
emitting regions, and accurate characterizations of the temperature and density
conditions of the X-ray sources. The wind absorption occurs not only by
bound-free transistions, but by bound-bound inner shell transistions. Thus,
diagnostic modelling of the AXAF spectra will provide new information not only
about the state of the hot emitting plasma, but also about of the cool wind. We
propose AXAF transmission grating observations of 3 bright O-stars: Iota Ori
(LETG), Zeta Pup (METG/HETG), and Delta Ori (LETG).

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:32:00.30  -00:17:57.00  DELTA ORI             ACIS-S HETG  50.00
 08:03:35.10  -40:00:12.10  ZETA PUP              ACIS-S HETG  75.00

===================================================================================

Proposal Number: 01200951            
Proposal Title: COORDINATED AXAF AND HST SPECTROSCOPY OF FLARES ON PROXIMA
CENTAURI

PI: JEFFREY LINSKY                 
Subject Category: NORMAL STARS AND WD                               

Abstract: AXAF provides the first opportunity to study the dynamics of flaring
plasma using the powerful tools of X-ray spectroscopy. We request AXAF
observations of the nearest flare star, Proxima Centauri (M6 Ve), as part of a
UNIQUE OPPORTUNITY for simultaneous X-ray and UV flare spectroscopy. We have 8
orbits (about 46 ks) of HST Cycle 8 GTO time (June 1999-May 2000) for high
resolution UV spectra of Prox Cen in the continuous viewing zone. Simultaneous
AXAF grating spectra will permit us to study the plasma motions and EM(T) with
high time resolution to characterize the flare energetics at all layers in the
atmosphere and to determine whether the 2-ribbon flare model as appropriate.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:29:42.90  -62:40:46.10  PROXIMA CENTAURI      ACIS-S NONE  16.00
 14:29:42.90  -62:40:46.10  PROXIMA CENTAURI      ACIS-S NONE  30.00
 14:29:42.90  -62:40:46.10  PROXIMA CENTAURI      ACIS-S HETG  46.00

===================================================================================

Proposal Number: 01200957            
Proposal Title: ACIS STUDY OF THE PERSEUS STAR FORMING CLOUD

PI: ERIC FEIGELSON                 
Subject Category: NORMAL STARS AND WD                               

Abstract: The Perseus cloud (d = 320 pc) is the nearest giant molecular cloud and
harbors two rich clusters of pre-main sequence stars: NGC 1333 and IC 348. The
proposed ACIS exposures will provide the deepest study of young stellar X-ray
emission ever achieved and should detect about 400 sources. This study will
improve the census of young stars in the clusters; probe the relationship between
X-rays, disks and outflows; and investigate X-ray properties as a function of
stellar luminosity, mass and especially age. The findings should give insight
into possible effects of magnetic activity on protostars and T Tauri stars, such
as X-ray and particle irradiation of the disk.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:29:05.60  +31:19:19.00  NGC 1333              ACIS-I NONE  50.00

===================================================================================

Proposal Number: 01200018            
Proposal Title: OBSERVATIONS WITH LETGS OF THE ECLIPSING BINARY ALGOL

PI: PETER PREDEHL                  
Subject Category: NORMAL STARS AND WD                               

Abstract: Algol is a bright eclipsing binary which is well suited to study the
geometry, the differential emission measure distribution, and the electron
density distribution of the coronal components.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:08:10.10  +40:57:20.50  ALGOL                 HRC-S  LETG  80.00

===================================================================================

Proposal Number: 01200028            
Proposal Title: STELLAR CORONAL SPECTROSCOPY OF STAR-FORMING REGIONS: ORION

PI: CLAUDE CANIZARES               
Subject Category: NORMAL STARS AND WD                               

Abstract: HETGS spectra will reveal a wealth of information on the temperature
and density structure of stellar coronae and winds. The Trapezium in Orion
contains many hot and cool young stars. HETGS observations of Orion will
simultaneously obtain dispersed spectra of the brightest objects (hot stars), and
CCD PHA spectra of young cool stars. This observation will also test the
abilities of multiple source spectroscopy with HETGS.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:35:15.00  -05:23:29.50  TRAPEZIUM             ACIS-S HETG  40.00
 05:35:15.00  -05:23:29.30  TRAPEZIUM             ACIS-S HETG  33.00

===================================================================================

Proposal Number: 01200029            
Proposal Title: STELLAR CORONAL SPECTROSCOPY OF COOL STARS

PI: CLAUDE CANIZARES               
Subject Category: NORMAL STARS AND WD                               

Abstract: HETGS spectra will reveal a wealth of information on the temperature
and density structure of stellar coronae. In addition, rotational or eclipse
modulation can be used to further determine geometric structure. Two RS CVn stars
will be observed with HETG and ACIS-S: AR Lac, and II Peg. AR Lac data will be
taken through primary eclipse to map emitting structures. One pre-main-sequence
star, TW Hya, which is a nearby, isolated, classical T Tauri object, will provide
detail on the nature of young-star X-ray emission.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:01:52.00  -34:42:16.00  TW HYA                ACIS-S HETG  50.00
 22:08:40.80  +45:44:32.00  AR LAC-4 ECLIPSE (2)  ACIS-S HETG  35.00
 22:08:40.80  +45:44:32.00  AR LAC-1  ECLIPSE (1  ACIS-S HETG  35.00
 22:08:40.80  +45:44:32.00  AR LAC-3 LAST QUAD (  ACIS-S HETG   7.50
 22:08:40.80  +45:44:32.00  AR LAC-6 LAST QUAD (  ACIS-S HETG   7.50
 22:08:40.80  +45:44:32.00  AR LAC-2 FIRST QUAD   ACIS-S HETG   7.50
 22:08:40.80  +45:44:32.00  AR LAC-5 FIRST QUAD   ACIS-S HETG   7.50
 23:55:04.00  +28:38:01.00  II PEG (HD 224085)    ACIS-S HETG   1.00
 23:55:04.00  +28:38:01.00  II PEG (HD 224085)    ACIS-S HETG  50.00

===================================================================================

Proposal Number: 01200031            
Proposal Title: DEEP ACIS IMAGING OF THE CORE OF THE PLEAIDES CLUSTER

PI: JEFFREY LINSKY                 
Subject Category: NORMAL STARS AND WD                               

Abstract: We propose to obtain a single, 60 ksec, ACIS-I exposure of the core of
the 100 million year-old Pleiades open cluster. The 16x16 arcmin ACIS-I field of
view will contain at least 20 known ROSAT PSPC sources for which ACIS-I will
provide simultaneous, high signal-to-noise 0.5-7 keV light curves and
low-resolution spectra. The ACIS-I image will also reveal 100-200 previously
unknown X-ray sources. Most will be associated with low-mass cluster members
including a few candidate brown dwarfs. The ACIS data will be used with recently
derived rotational periods to test rotation-activity at the low end of the
zero-age main sequence. The ACIS spectra and light curves will allow modeling of
X-ray flares and coronal heating for these young, active stars.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:46:46.00  +24:04:06.00  PLEIADES              ACIS-I NONE  23.75
 03:46:46.00  +24:04:06.00  PLEIADES              ACIS-I NONE  36.25

===================================================================================

Proposal Number: 01200032            
Proposal Title: AXAF GRATING SPECTROSCOPY OF ACTIVE BINARIES

PI: JEFFREY LINSKY                 
Subject Category: NORMAL STARS AND WD                               

Abstract: We propose to observe two active binaries with the AXAF HETGS and
LETGS. TZ CrB is a G0 V + G0 V RS CVn binary. The HETGS observation will span an
entire 1.14-d orbital period and will probably include one large flare. The HETGS
line profiles may reveal high-velocity material ejected at the onset of a flare.
Density and temperature-sensitive line ratios obtained at different orbital
phases will be used to map the coronal geometry of TZ CrB. 44 Boo is an
eclipsing, W UMa-type contact binary. The LETGS observation of 44 Boo will span
no less than two 0.27-d orbital periods and will be used to perform coronal
eclipse mapping and to investigate flares. Moreover, 44 Boo's maximum radial
velocity separation of 230 km/s should be resolved in the longer wavelength LETG
line profiles.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:03:47.30  +47:39:14.60  44 BOO                ACIS-S HETG  60.00
 16:14:41.60  +33:51:35.00  TZ CRB                ACIS-S HETG  85.00

===================================================================================

Proposal Number: 01200034            
Proposal Title: AXAF GRATING SPECTROSCOPY OF ACTIVE SINGLE STARS

PI: JEFFREY LINSKY                 
Subject Category: NORMAL STARS AND WD                               

Abstract: We propose to observe two active late-type single dwarfs with the AXAF
HETGS. AB Dor is a Pleiades-age K2 V rapid rotator at a distance of 15 pc. AB Dor
exhibits large-amplitude long-duration flares and rotationally modulated activity
at many wavelengths. The HETGS observation of AB Dor will span an entire 0.51-d
rotational period. AU Mic is a very active M1 V flare star at a distance of 10
pc. AB Dor and AU Mic are prototypes for extreme main-sequence magnetic activity.
The principal objectives of the HETGS observations are (i) to obtain
time-resolved X-ray spectra of flares and (ii) to obtain high signal-to-noise,
high-resolution spectra of very hot coronal sources to test optically thin
collisional ionization equilibrium plasma codes. Supporting ground-based
observations are planned.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:28:44.80  -65:26:56.00  AB DOR                ACIS-S HETG  60.00
 20:45:09.33  -31:20:24.00  AU MIC                ACIS-S HETG  60.00

===================================================================================

Proposal Number: 01200039            
Proposal Title: YOUNG STARS IN THE ORION TRAPEZIUM CLUSTER

PI: GORDON GARMIRE                 
Subject Category: NORMAL STARS AND WD                               

Abstract: The Orion Trapezium cluster is the richest and densent cluster of
pre-main sequence stars in the solar neighborhood, and the nearest region of
high-mass star forming region. It is a superb laboratory for study of X-ray
emission from protostars, classical and weak-lined T Tauri stars. The proposed
observation should detect hundreds of stars, dozens of powerful
magnetically-induced flares. X-ray emission from embedded protostars and massive
OB stars will also be studied. The relationaships between X-ray emission and
other stellar properties, and the influence of magnetic activity on star and
planet formation, will be investigated.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:35:15.00  -05:23:20.00  TRAPEZIUM CLUSTER     ACIS-I NONE  13.74

===================================================================================

Proposal Number: 01200043            
Proposal Title: X-RAYS FROM THE YOUNGEST STARS IN THE CORONA AUSTRALIS CLOUD

PI: GORDON GARMIRE                 
Subject Category: NORMAL STARS AND WD                               

Abstract: Low-mass pre-main sequence stars from protostars to post-T Tauri stars
have X-ray emission considerably above that seen in older stars. Powerful flares
from Class I protostars are particularly important and poorly understood. The
core of the nearby star forming cloud in Corona Australis contains several X-ray
emitting protostars as well as T Tauri and Herbig Ae/Be stars with associated
outflows.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 19:01:50.60  -36:57:30.00  CRA CLOUD CORE        ACIS-I NONE  20.00

===================================================================================

Proposal Number: 01200050            
Proposal Title: YOUNG STARS AND OUTFLOWS IN LYNDS 1641

PI: GORDON GARMIRE                 
Subject Category: NORMAL STARS AND WD                               

Abstract: The Orion molecular cloud contains a wide range of star forming
environments, from rich high-mass clusters to distributed low-mass star
formation. This observation focuses on the latter. The field includes a number of
T Tauri stars, the Herbig Ae/Be star V380, and the high-velocity Herbig-Haro
objects HH-1 and HH-2. Soft X-rays from the outflow, or hard Fe-K emission from a
diffuse plasma, may also be detected. A short exposure will resolve the whether
the B9 star HD 37001 or a nearby M4 star is responsible for the ROSAT source
RX0535-0633.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:35:08.00  -06:33:47.00  HD 37001              ACIS-I NONE   2.00
 05:36:22.80  -06:46:09.00  HH 1                  ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01200051            
Proposal Title: ACIS OBSERVATION OF 30 DORADUS

PI: GORDON GARMIRE                 
Subject Category: NORMAL STARS AND WD                               

Abstract:  30 Doradus is a bright star-forming region in the LMC.  It contains
over 100 OB stars and has been observed to be a source of diffuse X-rays.  This
AXAF observation will measure spectra of young stars and of the diffuse emission.
Energy balance and emission processes in the nebula will be studied.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:38:42.85  -69:06:03.00  30 DORADUS            ACIS-I NONE   2.00
 05:38:42.85  -69:06:03.00  30 DORADUS            ACIS-I NONE  28.00

===================================================================================

Proposal Number: 01200059            
Proposal Title: EMISSION FROM LATE-TYPE STARS

PI: STEPHEN MURRAY                 
Subject Category: NORMAL STARS AND WD                               

Abstract: Our proposed program to understand the X-ray emission from late-type
stars will address three important issues: i) establish whether the ``solar
analogy'' is invariably appropriate (and under what circumstance it may not
apply), ii) determine coronal characteristics and their dependence on the
properties of the underlaying stars (including rotation, color, and metallicity),
and iii) understand the variation of activity levels at the low-mass end of the
main sequence, where the convection zone may penetrate to near the stellar
center.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:39:11.90  +65:01:11.00  PI-1 UMA              HRC-S  LETG  30.00
 10:19:38.00  +19:52:14.30  AD LEO                HRC-S  LETG  10.00

===================================================================================

Proposal Number: 01200060            
Proposal Title: EMISSION FROM EARLY-TYPE STARS

PI: STEPHEN MURRAY                 
Subject Category: NORMAL STARS AND WD                               

Abstract: These observations will investigate the origin of X-ray emission from
early-type stars and seek to discriminate between existing models which can be
grossly characterized as either ``coronal'' or ``shocked wind''. For the nearest
examples of this stellar class, the HRC-I should be able to distinguish between
X-ray emission from within the stellar wind ``bubble'' and that emanating from
the surrounding interstellar medium. High resolution spectroscopic observations
with the HRC-S+LETGS can determine the variation of the soft X-ray absorption as
a function of bolometric luminosity, spectral type, and mass loss rate. This
absorption holds the observational key to understanding the relative position of
the X-ray source(s) and the ambient massive cool winds which emanate from OB
stars.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:03:35.10  -40:00:12.00  Z eta Pup             HRC-S  LETG  25.00

===================================================================================

Proposal Number: 01200061            
Proposal Title: STAR FORMING REGIONS AND YOUNG CLUSTERS

PI: STEPHEN MURRAY                 
Subject Category: NORMAL STARS AND WD                               

Abstract: Our observations of star formation regions and young compact clusters
will address: i) stellar collapse and commencement of nuclear burning -
associated high X-ray activity makes such observations one of the best techniques
for selecting young stars in molecular clouds for detailed study; and ii) the
question of the existence of the X-ray activity in low mass stars at the onset of
full convection - the problem of conflicting evidence arising from studies of
field M dwarfs can be addressed by observing young open clusters cores over a
range of ages and by examining the behavior of Lx and Lx/L_bol with spectral type
and/or rotation.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:35:16.70  -05:23:24.00  ORION TRAPEZIUM SFR   HRC-I  NONE  69.00
 07:58:07.10  -60:45:36.00  NGC 2516              HRC-I  NONE  49.00
 23:23:25.80  +58:48:53.40  CAS A                 HRC-I  NONE  50.00
 23:23:27.85  +58:48:42.10  CAS A                 HRC-S  NONE  50.00

===================================================================================

Proposal Number: 01200126            
Proposal Title: OBSERVATIONS OF STELLAR CORONAE WITH LETGS

PI: PETER PREDEHL                  
Subject Category: NORMAL STARS AND WD                               


                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 07:34:37.60  +31:52:10.88  YY GEM                HRC-S  LETG  58.00

===================================================================================

Proposal Number: 01200128            
Proposal Title: OBSERVATIONS OF STELLAR CORONAE WITH LETGS

PI: ALBERT BRINKMAN                
Subject Category: NORMAL STARS AND WD                               


                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:39:36.20  -60:50:07.00  ALPHA CEN             HRC-S  LETG  80.00

===================================================================================

Proposal Number: 01200142            
Proposal Title: HIGH RESOLUTION SPECTROSCOPY OF WHITE DWARFS

PI: STEPHEN MURRAY                 
Subject Category: NORMAL STARS AND WD                               

Abstract: H1504+65 is the hottest white dwarf star known. Its atmosphere appears
to be devoid of H or He, perhaps from mass loss during several cycles through the
red giant phase. If so this star reveals directly the products of nuclear burning
in the core of its progenitor. A high resolution spectrum can identify the
elements in the photosphere. If present, the detection of Ne and its abundance
will provide important information on the physical conditions in the core.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:02:08.10  +66:12:24.00  H1504+65              HRC-S  LETG  25.00



***********************************************************************************
WD BINARIES AND CV                                
--------------------------------------------------

===================================================================================

Proposal Number: 01300181            
Proposal Title: THE NATURE OF THE SUPERSOFT X-RAY SOURCE RXJ0439.8-6809

PI: Andre Van Teeseling            
Subject Category: WD BINARIES AND CV                                

Abstract: The supersoft X-ray source RXJ0439.8-6809 is either the hottest known
pre-white dwarf or an accreting double-degenerate white-dwarf binary. In the
first case, RXJ0439.8-6809 puts strong constraints on the evolution of post-AGB
stars; in the second case, it may have the shortest orbital period among all
known accreting binaries. We propose to obtain a 40 ksec HRC-S+LETG observation,
which will accurately determine the nature of the X-ray spectrum and the
corresponding physical parameters, provide an accurate Rayleigh-Jeans
extrapolation necessary to interprete the scheduled HST observations, possibly
prove the white-dwarf nature of the X-ray source by detecting NeVIII absorption
edges, and at best detect the predicted orbital period of a few minutes.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:39:49.60  -68:09:01.00  RX J0439.8-6809       HRC-S  LETG  40.00

===================================================================================

Proposal Number: 01300218            
Proposal Title: ESTABLISHING THE TRUE NATURE OF RX J0925.7-4758 WITH AXAF

PI: Hendrik Hartmann               
Subject Category: WD BINARIES AND CV                                

Abstract: This proposal is a continuation of a series of studies of the Supersoft
Source RXJ0925.7-4758. Earlier studies involve spectra obtained by ROSAT, ASCA
and Beppo-SAX. Many questions regarding the nature of RXJ0925.7-4758 have arisen
that could not be answered using the available observations. This is due to the
limited spectral resolution of ASCA SIS and Beppo-SAX LECS. We believe that the
high spectral resolution of AXAF MEG/ACIS-S will definitively establish the true
nature of RXJ0925.7-4758. Fitting grids of detailed model spectra, available to
the investigators, will tightly constrain parameters like temperature, gravity
and abundances. Thus we will be able to decide between a white dwarf, neutron
star or black hole as a model for RXJ0925.7-4758.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:25:46.20  -47:58:16.60  RX J0925.7-4758       ACIS-S HETG  60.00

===================================================================================

Proposal Number: 01300301            
Proposal Title: THE TEMPERATURE STRUCTURE IN THE ACCRETION REGION OF AM HERCULIS

PI: KLAUS REINSCH                  
Subject Category: WD BINARIES AND CV                                

Abstract: We propose to obtain a 24 ksec HRS-C LETG observation of AM Her, the
prototype system of the magnetic cataclysmic variables. High resolution
spectroscopy in the 0.1-6 keV energy range will allow us to quantitatively
compare the soft X-ray spectrum with detailed accretion-heated model atmospheres.
Absorption and emission edges of C, N, O, and Ne will provide diagnostic
information on the ionization and temperature structure of the accretion region
and on the structure, density, and homogenity of the accretion flow and its
temporal fluctuations. There is good evidence from observations and theory that
with the AXAF LETG we will for the first time be able to resolve the long-sought
signatures of the temperature inversion in the heated atmosphere which are not
visible in the EUV.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:16:13.30  +49:52:03.00  AM HER                HRC-S  LETG  24.00

===================================================================================

Proposal Number: 01300474            
Proposal Title: HIGH-RESOLUTION X-RAY SPECTROSCOPY OF SS CYGNI IN QUIESCENCE

PI: PETER WHEATLEY                 
Subject Category: WD BINARIES AND CV                                

Abstract: We propose an AXAF HETGS observation of the brightest dwarf nova SS
Cygni in its normal quiescent state. The unprecedented spectral resolution
afforded by AXAF will make this the first observation of a hard-X-ray
cataclysmic-variable boundary layer in which it is possible fully to resolve
individual lines (other than Fe-K). The spectrum will allow us to measure the
temperature distribution of the shock-heated plasma and constrain its density and
elemental abundances. Measurement of these quantities will form the observational
basis on which to build a theoretical understanding of the complex shocks which
form in the strongly-shearing flow of the boundary layer.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 21:42:42.00  +43:35:10.00  SS CYGNI              ACIS-S HETG  50.00

===================================================================================

Proposal Number: 01300514            
Proposal Title: A STUDY OF THE CLASSIC BOUNDARY LAYER IN U GEM AT QUIESCENCE

PI: PAULA SZKODY                   
Subject Category: WD BINARIES AND CV                                

Abstract: We will use the HETG to observe the 0.4-10 keV spectrum of the
simplest, most straightforward, bright disk system at quiescence (the
prototypical dwarf nova U Gem) in order to obtain good diagnostics for the
boundary layer plasma as it undergoes transition from an 8 keV low density region
to the atmosphere of a 30,000K white dwarf. The use of the Fe lines at 6.4-6.7
keV together with the emission lines in the 0.5-2 keV region will provide
information on the correct temperature and density structure, the
photoionization/collisional processes and the abundances of the material
transferred from the secondary star. In addition, the velocity broadening in the
lines will give insight into the rotation and location of the gas.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 07:55:05.30  +22:00:05.70  U GEM                 ACIS-S HETG 100.00

===================================================================================

Proposal Number: 01300579            
Proposal Title: BROAD-BAND HIGH RESOLUTION SPECTROSCOPY OF SS CYGNI IN OUTBURST

PI: CHRISTOPHER MAUCHE             
Subject Category: WD BINARIES AND CV                                

Abstract: We propose to observe the dwarf nova SS Cygni in outburst with the AXAF
LETGS and HETGS to (1) measure the differential emission measure of the X-ray
emitting plasma over three decades in temperature (from ~ 3e5 to 3e8 K), (2)
measure the abundances and density of the plasma responsible for the hard
component of the spectrum, (3) determine or constrain the physical conditions and
emission mechanism(s) responsible for the soft component of the spectrum, and (4)
measure the spectrum of the soft X-ray oscillations, thereby diagnosing their
cause. Finally, assisted by simultaneous RXTE observations, we will measure the
line and continuum spectrum reflected from the surface of the white dwarf and
accretion disk.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 21:42:42.30  +43:35:08.00  SS CYG                ACIS-S HETG  35.00
 21:42:42.30  +43:35:08.00  SS CYG                ACIS-S HETG  65.00

===================================================================================

Proposal Number: 01300628            
Proposal Title: HETG SPECTROSCOPY OF BRIGHT INTERMEDAITE POLARS

PI: KOJI MUKAI                     
Subject Category: WD BINARIES AND CV                                

Abstract: Intermediate Polars (IPs) are the hard X-ray brightest subclass of
magnetic Cataclysmic Variables. Previous X-ray observations, notably those with
ASCA, have established the complex nature of their spectra: multi-temperature
plasma and complex absorber are both required. Moreover, one recent study
suggests that the Fe lines are Compton broadened in at least some systems. We
propose HETG observations of 2 bright IPs, V1223 Sgr and AO Psc, to search for
K-alpha lines of Ne, Mg, Si, S, Ar and Ca; to measure the physical widths of any
lines we do detect; to search for a direct evidence for an ionized absorber; and
to obtain an improved characterization of the spin modulation.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:55:02.30  -31:09:49.30  V1223 SGR             ACIS-S HETG  50.00

===================================================================================

Proposal Number: 01300669            
Proposal Title: STUDYING THE OLD NOVA SHELL OF GK PERSEI IN X-RAYS

PI: SOLEN BALMAN                   
Subject Category: WD BINARIES AND CV                                

Abstract: We propose an AXAF ACIS-I observation to study the detailed morphology
and the spectrum of the nova shell of GK Persei 1901 SIMULTANEOUSLY in X-ray
wavelengths. The shell was recently detected with the ROSAT HRI, thus no spectral
information was derived from the data. We plan to exploit the spatial and
spectral capabilities of the ACIS-I detector in order to study the spectrum of
the source in comparison to other wavelengths. We expect that such an observation
will have great implications on our understanding of the classical novae
evolution , outburst mechanisms together with the interaction of the nova shells
with their environments of interstellar or circumstellar origin and physics of
strong shock formation.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:31:12.00  +43:54:17.00  GK PERSEI             ACIS-S NONE 100.00

===================================================================================

Proposal Number: 01300820            
Proposal Title: THE X-RAY SPATIAL AND SPECTRAL STRUCTURE OF R AQUARII

PI: EDWIN KELLOGG                  
Subject Category: WD BINARIES AND CV                                

Abstract: The nearby (~200pc) R Aqr symbiotic system, a known EXOSAT/ROSAT
source, is a well-known prototype for non-relativistic astrophysical jets, giving
a unique AXAF opportunity to resolve spatially an x-ray system with mass infall
onto a compact hot object with an accretion disk and jet. The R Aqr jet has been
extensively observed in the UV, optical, and radio by Hollis et al. Previous
ROSAT HRI observations could not resolve the jet, but, based on HST UV and VLA
radio data, shock model temperatures indicate that an x-ray jet is about the same
size as the UV jet. This AXAF observation will yield ~4000 counts, enough for a
high quality image. Using the ACIS BI spectrum, optically thin hot gas lines will
be evident; time variations and source modeling will also be pursued.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 23:43:49.45  -15:17:04.19  R AQUARII             ACIS-S NONE  26.00

===================================================================================

Proposal Number: 01300860            
Proposal Title: MULTIWAVELENGTH TOO OBSERVATIONS OF BRIGHT NOVAE IN OUTBURST

PI: SUMNER STARRFIELD              
Subject Category: WD BINARIES AND CV                                

Abstract: We propose to obtain spectrophotometry with the ACIS-FI instrument,
plus contemporaneous ground based optical and infrared spectra, of bright novae
in outburst. Previous studies with X-ray satellites have shown that they are the
best tool for studying the hot phases of the nova outburst. In these
observations, both soft and hard emission components were found. Observations of
the soft component will provide a unique opportunity to study the composition of
the ejecta, the lifetime of the outburst, and the evolution of the white dwarf.
The hard component is, as yet, unexplained and further observations are urgently
needed to understand its cause and behavior which will improve our understanding
of the evolution of the ejecta. We will obtain observations of both components
when possible.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:44:48.37  -52:25:30.61  V382 Velorum 1999     HRC-S  LETG  25.00
 10:44:48.37  -52:25:30.61  V382 Velorum 1999     ACIS-I NONE  20.00
 10:44:48.37  -52:25:30.61  V382Velorum1999       ACIS-I NONE   5.00
 10:44:48.37  -52:25:30.61  V382Velorum1999       ACIS-I NONE  10.00
 19:23:05.28  +04:57:21.06  V1494AQL              ACIS-I NONE   5.00
 19:23:05.28  +04:57:21.60  V1494 Aql             HRC-S  LETG   8.00
 19:23:05.28  +04:57:21.60  V1494 Aql             HRC-S  LETG  17.00
 19:23:05.28  +04:57:21.60  V1494 Aql             ACIS-I NONE   5.00
 19:23:05.28  +04:57:21.60  V1494 Aql             ACIS-I NONE   5.00

===================================================================================

Proposal Number: 01300889            
Proposal Title: X-RAY CONSTRAINTS ON THE BINARY STAR POPULATIONS IN OMEGA
CENTAURI

PI: Adrienne Cool                  
Subject Category: WD BINARIES AND CV                                

Abstract: We propose to obtain a 70 ksec ACIS observation of the globular cluster
Omega Cen. A high rate of stellar interactions and large core make Omega Cen a
prime target for the study of low-luminosity cluster X-ray sources. We will (1)
measure the luminosity function and radial distribution of cataclysmic variables
down to Lx = 2e30 erg/s; (2) determine the frequency of RS CVn X-ray binaries in
a globular cluster for the first time; (3) provide the accurate positions needed
for identifying optical counterparts in crowded fields; and (4) enable detailed
comparisons between clusters with different dynamical properties. An order of
magnitude more sensitive than previous work, this study will provide new
constraints on primordial and capture binaries that are vital to cluster
dynamical evolution.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:26:45.90  -47:28:37.00  NGC 5139              ACIS-I NONE  25.00

===================================================================================

Proposal Number: 01300897            
Proposal Title: X-RAYING COMPACT BINARIES IN THE EXTREME GLOBULAR CLUSTER,
TERZAN 5

PI: JONATHAN GRINDLAY              
Subject Category: WD BINARIES AND CV                                

Abstract: The extreme stellar density and yet relatively large core of the
massive globular cluster Terzan 5 make it the ideal target for the study of the
formation of compact objects and binaries in dense stellar systems. We propose a
deep ACIS-I exposure to study both its known LMXB and bright (eclipsing) MSP and
to measure its underlying distribution of LMXBs, CVs and MSPs. When combined with
our upcoming HST/NICMOS survey of Ter5 for emission line object identifications,
this AXAF observation will set significant constraints on the origin of cluster
binaries and neutron stars, the evolutionary links between LMXBs and MSPs, and
the cluster gravitational potential.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:48:04.90  -24:46:44.90  TERZAN 5              ACIS-I NONE   5.00
 17:48:04.90  -24:46:44.90  TERZAN 5              ACIS-I NONE  45.00

===================================================================================

Proposal Number: 01300004            
Proposal Title: OBSERVATIONS OF SUPER SOFT X-RAY SOURCES WITH LETGS

PI: PETER PREDEHL                  
Subject Category: WD BINARIES AND CV                                

Abstract: The standard model of supersoft X-ray sources (SSS) adopts a WD burning
accreted H stably on its surface. These LETG observations of both the prototype
SSS CAL83 and the brightest ROSAT SSS (2c/s) will test this model by resolving
for the first time the predicted absorption edges of heavy elements (mainly C+O)
in the WD atmosphere. ASCA/SAX observations give first hints for edges, but have
too poor sensitivity below 0.5 keV. Also, the XMM grating can only be used for RX
J0925.7-4758, a particularly hard SSS in the galactic plane. RX J0019.8+2156 is
the brightest galactic SSS with HRC-S-LETG, giving 0.2 cts/s, kT=35 eV bbdy,
logNH=20.6-20.8.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:19:50.00  +21:56:54.00  RX J0019.8+2156       HRC-S  LETG  50.00

===================================================================================

Proposal Number: 01300005            
Proposal Title: X-RAY SPECTROSCOPY OF THE SOFT INTERMEDIATE POLAR RE0751+14

PI: PETER PREDEHL                  
Subject Category: WD BINARIES AND CV                                

Abstract: RE0751+14 is the brightest of a new class of intermediate polars
discovered by ROSAT. Its soft X-ray spectrum is dominated by a blackbody-like
component with a temperature of about 50 eV, reminiscent of that seen in the
strongly magnetic polars. In analogy the soft component probably originates from
an accretion-heated surface region around the white dwarfs magnetic pole(s). We
propose to do high resolution X-ray spectroscopy of RE0751+14 to investigate in
detail the soft spectral component. Resolving spectral features will provide very
valuable information on the emission mechanism and the white dwarf atmosphere. It
will be vital to find the physical parameters which rule the production of the
soft X-ray component in soft intermediate polars.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 07:51:17.30  +14:44:23.00  RE 0751+14            HRC-S  LETG  50.00

===================================================================================

Proposal Number: 01300009            
Proposal Title: OBSERVATIONS OF SUPER SOFT X-RAY SOURCES WITH LETGS

PI: ALBERT BRINKMAN                
Subject Category: WD BINARIES AND CV                                

Abstract: The standard model of supersoft X-ray sources (SSS) adopts a WD burning
accreted H stably on its surface. These LETG observations of both the prototype
SSS CAL83 and the brightest ROSAT SSS (2 c/s) will test this model by resolving
for the first time the predicted absorption edges of heavy elements (mainly C+O)
in the WD atmosphere. ASCA/SAX observations give first hints for edges, but have
too poor sensitivity below 0.5 keV. Also, the XMM grating can only be used for RX
J0925.7-4758, a particularly hard SSS in the galactic plane. CAL83 is a bright
LMC source with a predicted 0.09 cts/s, kT=35 eV bbdy, logNH=20.6-20.8).

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:43:33.50  -68:22:23.00  CAL 83                HRC-S  LETG  50.00

===================================================================================

Proposal Number: 01300075            
Proposal Title: DIFFUSE X-RAY EMISSION IN GLOBULARS: HOT GAS VS. NON-THERMAL
EMISSION IN 47 TUC

PI: STEPHEN MURRAY                 
Subject Category: WD BINARIES AND CV                                

Abstract: We propose a deep ACIS-S observation of 47 Tuc to confirm and map our
ROSAT discovery of diffuse emission from a probable bow shock and possible
non-thermal emission from the large population of millisecond pulsars. The bow
shock emission will be mapped out to 5-10arcmin from the peak diffuse emission
and measure the proper motion of the cluster in the Galaxy. The spectral
distribution will constrain both the mass loss of cluster stars and the
temperature-density of the hot gas in the galactic halo. The possible IC emission
from low energy CR electrons accelerated in the bow shock will constrain the MSP
population and particle production in the cluster, while the spectra of point
sources will complement and extend our deep HRC-I survey for CVs and dim x-ray
sources in this key cluster.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:24:05.83  -72:04:51.24  47 TUC                ACIS-I NONE   1.00
 00:24:05.83  -72:04:51.24  47 TUC                ACIS-I NONE   4.00
 00:24:05.83  -72:04:51.24  47 TUC                ACIS-I NONE   4.00
 00:24:05.83  -72:04:51.24  47 TUC                ACIS-I NONE  32.50
 00:24:05.83  -72:04:51.24  47 TUC                ACIS-I NONE  32.50

===================================================================================

Proposal Number: 01300129            
Proposal Title: NATURE AND ORIGIN OF CATACLYSMIC VARIABLES AND DIM X-RAY SOURCES
IN GLOBULAR CLUSTERS

PI: STEPHEN MURRAY                 
Subject Category: WD BINARIES AND CV                                

Abstract: We propose a deep initial study of the CV population and dim x-ray
sources in two globular clusters, NGC 6397 and 47 Tuc. Both clusters have
extensive dim (Lx ~ 10^31-33 erg/s) x-ray source populations which our ROSAT/HST
studies have shown are likely dominated by CVs although the brightest sources in
47 Tuc may also include quiescent LMXBs. The HRC-I (47Tuc) and ACIS-S (NGC 6397)
images will allow the luminosity function, variability, and source
identifications (with planned HST followup) to be measured and constraints on the
origin of cluster WDs and NSs as well as compact binaries in these two
contrasting globulars (differing in metallicity, halo vs. disk, and mass) to be
derived. A complementary ACIS-S study of 47Tuc will measure spectra of both dim
sources and the diffuse emission.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:40:42.20  -53:40:23.70  NGC 6397              ACIS-I NONE  49.00

===================================================================================

Proposal Number: 01300130            
Proposal Title: SUPER-SOFT X-RAY SOURCES

PI: STEPHEN MURRAY                 
Subject Category: WD BINARIES AND CV                                

Abstract: The nature of a large subset of luminous supersoft X-ray sources (SSSs)
has not yet been established. Although they are thought to be white dwarfs
steadily burning accreted matter, there is no definitive evidence that this
picture is correct: in particular we do not have direct evidence that any of the
systems contain an accreting white dwarf. The observations we propose will
provide good spectral information for all of the SSSs that are candidates for the
nuclear-burning white dwarf model. We will be able to extract values of the
temperature, luminosity and N_H, and to see evidence of absorption edges that may
be associated with the white dwarf's atmosphere.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:19:50.00  +21:56:54.00  RX J0019.8+2156       ACIS-S NONE   1.00
 00:37:19.80  -72:14:13.00  1E 0035.4-7230        ACIS-S NONE   5.70
 00:58:37.00  -71:35:48.00  1E 0056.8-7154        ACIS-S NONE  13.30
 04:39:49.60  -68:09:02.00  RX J0439.8-6809       ACIS-S NONE   8.00
 05:43:33.50  -68:22:33.00  CAL 83                ACIS-S NONE   2.00
 09:25:46.20  -47:58:17.00  RX J0925.7-4758       ACIS-S NONE   1.00
 16:01:40.90  +66:48:10.00  AG DRA                ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01308004            
Proposal Title: BZ CAM - A TRANSIENT SUPERSOFT X-RAY SOURCE?

PI: ROSANNE DI STEFANO             
Subject Category: WD BINARIES AND CV                                

Abstract: BZ Cam is a binary with a 221 min. period. It contains an accreting
white dwarf and a 0.3-0.4 solar mass main-sequence donor. BZ Cam belongs to the
group of variables called VY Scl stars. Most of the time it spends at V=12.7 mag,
but during low states it has V=14.3 mag. BZ Cam is surrounded by a faint emission
nebula (AA 181, 373). Photoionization by a canonical cataclysmic variable cannot
account for the nebular excitation (emission line ratios). The proposed ACIS-S
observation will test the hypothesis that BZ Cam, like V751 Cyg (A&A 343, 183)
and the canonical supersoft source (SSS) RX J0513.9-6951, emits luminous
supersoft X-rays during its optical low-state. If supersoft X-rays could be
detected, it would have 2 major implications: (1) Discovery of new object class:
VY Scl stars = tra

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 06:29:34.00  +72:04:37.60  Mispointing           ACIS-S NONE   5.00

===================================================================================

Proposal Number: 01308010            
Proposal Title: BZ CAM - A TRANSIENT SUPERSOFT X-RAY SOURCE?

PI: ROSANNE DI STEFANO             
Subject Category: WD BINARIES AND CV                                

Abstract: BZ Cam is a binary with a 221 min. period. It contains an accreting
white dwarf and a 0.3-0.4 solar mass main-sequence donor. BZ Cam belongs to the
group of variables called VY Scl stars. Most of the time it spends at V=12.3-12.7
mag, but during low states it has V=14.3 mag. BZ Cam is surrounded by a faint
emission nebula (AA 181, 373). Photoionization by a canonical cataclysmic
variable cannot account for the nebular excitation (emission line ratios). The
proposed ACIS-S observation will test the hypothesis that BZ Cam, like V751 Cyg
(A&A 343, 183) and the canonical supersoft source (SSS) RX J0513.9-6951, emits
luminous supersoft X-rays during its optical low-state. If supersoft X-rays could
be detected, it would have 2 major implications: (1) Discovery of new object
class: VY Scl stars

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 06:29:34.00  +71:04:38.00  BZ CAM                ACIS-S NONE   5.00

===================================================================================

Proposal Number: 01308011            
Proposal Title: CHANDRA HETG SPECTROSCOPY OF EX HYDRAE

PI: STEVE HOWELL                   
Subject Category: WD BINARIES AND CV                                

Abstract: EX Hya is an eclipsing intermediate polar-type CV with strong H- and
He-like K alpha emission lines of Mg, Si, S, Ar, and Fe emission lines of Ne
VII-VIII and Fe XVIII-XXIII in the EUV spectrum. The density of the emitting
plasma of EX Hya is ~ 10^13 to 10^15 cm^-3, more than an order of magnitude
greater than that of the corona of cool stars. We propose a 60 ks Chandra HETG
spectrum of EX Hya to: (1) constrain the run of density with temperature (thereby
constraining models of the accretion column), (2) measure the amount of fluor-
escence from the irradiated surface of the WD, (3) measure elemental abundances
(controversial from the ASCA spectrum), and (4) spectroscopically measure the
density of the emitting plasma (via line ratios of He-like O VII, Ne IX, Mg XI,
Si XIII, S XV, Ar XVII

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:52:24.40  -29:14:56.00  EX HYA                ACIS-S HETG  60.00

===================================================================================

Proposal Number: 01308030            
Proposal Title: THE NATURE OF CLASSICAL SYMBIOTIC OUTBURSTS

PI: PHIL CHARLES                   
Subject Category: WD BINARIES AND CV                                

Abstract: Symbiotic stars may be the progenitors of the cosmologically important
Type Ia SNe. The high accretion rate onto the white dwarfs (WDs) in these
binaries allows for steady, rather than explosive burning as in classical novae.
The accreted material can therefore remain on the WD, driving its mass closer to
the Chandrasekhar limit, rather than being blown off in a nova. OR CAN IT?
Classical symbiotics experience outbursts typically every 10 - 20 years, and
these events are not well-understood. After the 1985 outburst of the class
prototype, Z Andromedae (which is also a 28-minute pulsar), it appeared that a
shell of material had been ejected from the WD. This object has recently outburst
again. An X-ray observation within roughly one month will provide v, T, and
density diagnostics deep wit

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 23:33:40.00  +48:49:06.00  Z ANDROMEDAE          ACIS-S HETG  20.00


***********************************************************************************
BH AND NS BINARIES                                
--------------------------------------------------

===================================================================================

Proposal Number: 01400221            
Proposal Title: THE BINARY MS-PULSAR PSR J0218+4232 AND ITS PROBABLE SYNCHROTRON
NEBULA

PI: Lucien Kuiper                  
Subject Category: BH AND NS BINARIES                                

Abstract: In a recent 100 ks ROSAT HRI observation of the binary ms-pulsar PSR
J0218+4232 we detected a lightcurve with two narrow pulses; the measured width of
the main pulse (350 microsec) is compatible with the scatter in the ROSAT clock.
About 60% of the emission is unpulsed and can be explained by emission from a
compact nebula with diameter ~14'', compatible with available radio data. Only
AXAF's HRC-I can disentangle the spatial emission, as well as resolve the narrow
structures in the lightcurve; a 75 ks observation suffices. We further propose a
spectral study of this ms-pulsar and its probable synchrotron nebula with AXAF's
ACIS-I detector (100 ks) in order to investigate the underlying production
processes.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:18:06.30  +42:32:17.40  PSR J0218+4232        HRC-I  NONE  75.00
 02:18:06.30  +42:32:17.40  PSR J0218+4232        HRC-S  NONE  75.00

===================================================================================

Proposal Number: 01400342            
Proposal Title: SPECTRAL VARIABILITY IN A SUPERGIANT X-RAY BINARY

PI: BRAM BOROSON                   
Subject Category: BH AND NS BINARIES                                

Abstract: We will observe the supergiant X-ray binary 4U 1700-37 for 40-50% of
its orbit, from its normal bright state through the pre-eclipse absorption state,
and into eclipse. We will map the accreting wind from the variable absorption
column and absorption edges. We expect to see a rich line spectrum including
fluorescent and recombination lines. We will investigate the response of these
lines and the absorption to X-ray flares. By mapping the gas jet from the
companion and the stellar wind, we can determine the accretion rate from the both
the spherical wind and from Roche lobe overflow.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:03:56.59  -37:50:38.90  4U 1700-37            ACIS-S HETG  40.00

===================================================================================

Proposal Number: 01400425            
Proposal Title: AN X-RAY IMAGING SURVEY OF JETS FROM X-RAY BINARIES : ENERGETICS
OF OUTFLOWS FROM NEUTRON STARS AND BLACK HOLES

PI: ROBERT FENDER                  
Subject Category: BH AND NS BINARIES                                

Abstract: We propose to use ACIS-I to image the fields of the eight X-ray
binaries with strong evidence for relativistic jets. In this way we will
investigate the energetics of such outflows by observing the energy they deposit
in the ISM through interactions with the ambient medium. This will provide an
estimate of the power of such outflows from neutron stars and black holes which
is independent of the assumptions associated with estimates based on light curves
and radio observations, as well as shedding light on their local environments.
All the fields will be quasi-simultaneously mapped at a comparable resolution at
radio wavelengths to examine the relation between synchrotron-emitting electrons
and high energy emission.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:43:54.85  -29:44:42.76  1E 1740.7-2942        ACIS-I NONE  10.00
 19:11:49.50  +04:58:58.00  SS 433 (EAST JET)     ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01400453            
Proposal Title: ACIS-HETG OBSERVATIONS OF GRS1915+105: A MICRO BAL-QUASAR ?

PI: JULIA LEE                      
Subject Category: BH AND NS BINARIES                                

Abstract: Previous ASCA observations of the X-ray transient GRS1915+105 have
revealed prominent absorption lines from highly ionized iron, possibly due to a
photoionized wind from the putative black hole accretion disk. We propose to
perform high resolution spectroscopy of the iron line complex via a 30ksec
ACIS-S/HETG observation. The line of sight velocity and velocity dispersion of
the absorbing matter will be accurately measured, and the P-Cygni profiles
(confirming the presence of a wind) will be sought. By aligning the ACIS-S with
the axis of the known jet, we will be sensitive to any multiple-arcminute scale
structure in this jet. We also aim to propose for RXTE observations which will
compliment this study by constraining the geometry/structure of the disk/corona
system.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 19:15:11.40  +10:56:44.00  GRS 1915+105          ACIS-S HETG  30.00

===================================================================================

Proposal Number: 01400467            
Proposal Title: THE FAINTEST 'FIELD' LOW-MASS X-RAY BINARIES

PI: MICHIEL VAN DER KLIS           
Subject Category: BH AND NS BINARIES                                

Abstract: There exists a group of persistently faint galactic X-ray sources that,
based on characteristics such as location in the galaxy, high Lx/Lopt,
association with X-ray bursts, absence of X-ray pulsations and similar
characteristics are thought to be low-mass X-ray binaries but about which very
little is known. These objects have low Lx and most have not been optically
identified. We propose to observe a sample of these sources with ACIS in modes
and with exposure times tailored to obtain an arcsecond position, and to measure
a good X-ray spectrum and a good power spectrum. This will extend our knowledge
about the physics of accretion onto compact objects towards lower accretion rates
than previously accessible.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:12:24.90  -40:50:34.60  1708-408              ACIS-S NONE   1.00
 17:14:19.40  -34:02:43.00  1711-339              ACIS-S NONE   1.00
 17:38:17.00  -26:59:55.20  1735-269              ACIS-S NONE   1.00
 17:38:17.00  -26:59:55.20  1735-269              ACIS-S NONE   1.00
 17:39:30.40  -29:42:11.10  1736-297              ACIS-S NONE   1.00
 17:39:30.40  -29:42:11.10  1736-297              ACIS-S NONE  12.00
 17:49:48.50  -33:12:15.40  1746-331              ACIS-S NONE   1.00
 17:49:48.50  -33:12:15.40  1746-331              ACIS-S NONE   3.00
 17:50:03.90  -32:26:22.50  1746.7-3224           ACIS-S NONE   7.00
 18:15:16.50  -12:05:08.70  1812-12               ACIS-S NONE   1.00

===================================================================================

Proposal Number: 01400227            
Proposal Title: HIGH RESOLUTION SPECTROSCOPY OF THE ACCRETION DISK CORONA SOURCE
4U 1822-37

PI: STEVEN KAHN                    
Subject Category: BH AND NS BINARIES                                

Abstract: We propose to observe 4U 1822-37 with the ACIS-S-HETG. 4U 1822-37 is
the only observable accretion disk corona source in the original class of these
objects. Past observations have only detected a few low equivalent width lines
rather than the dense line emission expected from models of ADCs. Attempts to fit
these data have been unsuccessful leaving unanswered many questions regarding the
nature of the compact and companion stars and the mechanism of mass transfer and
coronal formation. With the high resolution of the HETG gratings we will be able
to finally resolve any existing line structure and use these diagnostics to
constrain models of this peculiar form of LMXB.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:25:46.70  -37:06:18.90  4U 1822-37            ACIS-S HETG  40.00

===================================================================================

Proposal Number: 01400560            
Proposal Title: THE LUMINOUS BURSTING X-RAY SOURCES IN GLOBULAR CLUSTER CORES:
LOCATION, LOCATION, AND LOCATION

PI: Bruce Margon                   
Subject Category: BH AND NS BINARIES                                

Abstract: The highly luminous bursting X-ray sources in the cores of globular
clusters are some of the most exotic stellar systems known. Recently HST imaging
has led to optical candidates for many of these central cluster sources, but
these candidates have a diverse range of properties. Even for the most accurate
(3") X-ray positions extant pre-AXAF, there are sometimes hundreds of candidate
counterparts permitted on positional grounds alone; evidence is thus quite
inconclusive, and some of the current candidates may be incorrect. We propose to
obtain highly accurate AXAF positions for most of the known sources, reducing the
number of candidates by up to 100X, using an instrument configuration that will
also provide a homogeneous set of high resolution spectra for much of the
sample.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:14:06.60  -40:02:36.80  NGC 1851              HRC-S  LETG  12.00
 17:27:33.20  -30:48:07.80  TERZAN 2              HRC-S  LETG   7.70
 17:33:24.00  -33:23:16.40  LILLER 1              HRC-I  NONE  15.40

===================================================================================

Proposal Number: 01400360            
Proposal Title: SOFT X-RAY DIAGNOSTICS OF A POSSIBLE ADC IN X2127+119

PI: NICHOLAS WHITE                 
Subject Category: BH AND NS BINARIES                                

Abstract: X2127+119 exhibits dips with a period of 17.1 hours. Its accretion disk
may possess an ionized corona (ADC), though the apparent lack of reprocessing of
a bright type I burst disputes this possibility. One diagnostic of ADC conditions
is strong discrete emission, whose analysis sheds light upon the location of and
temperature and ionization level in the reprocessing gas. To date this system has
never been observed spectroscopically with good energy resolution or at soft
X-ray energies (where spectral features abound). We propose two observations of
X2127+119: one using the ACIS-S-LETG and one using the ACIS-S-HETG. We show that
X2127+119 is sufficiently bright to produce good spectra and that such spectra
will likely include numerous strong soft emission features.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 21:29:58.30  +12:10:09.00  X2127+119             ACIS-S HETG  20.00

===================================================================================

Proposal Number: 01400607            
Proposal Title: BLACK HOLE EVENT HORIZONS AND ADVECTION-DOMINATED ACCRETION

PI: JEFFREY MCCLINTOCK             
Subject Category: BH AND NS BINARIES                                

Abstract: We propose to establish the existence of black-hole event horizons by
comparing accreting black holes to accreting neutron stars. Such a comparison is
feasible because black holes and neutron stars are both present in similar
environments in X-ray novae. Recently, a very successful model (ADAF model) has
been applied to X-ray novae. It predicts that variations in luminosity between
the quiescent state and the outburst state for X-ray novae that contain black
holes are expected to be > 100 times larger than for X-ray novae that contain
neutron stars. Preliminary results from ROSAT and ASCA support this prediction,
as expected if black holes have event horizons and neutron stars do not. The
proposed observations with AXAF can firmly establish whether black holes have
event horizons.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:21:42.80  +32:54:27.00  GRO J0422+32          ACIS-I NONE  20.00
 15:47:08.60  -47:40:10.00  4U 1543-47            ACIS-I NONE  10.00

===================================================================================

Proposal Number: 01400660            
Proposal Title: AXAF OBSERVATIONS OF THE RAPID BURSTER IN OUTBURST

PI: WALTER LEWIN                   
Subject Category: BH AND NS BINARIES                                

Abstract: The Rapid Burster (RB) is a recurrent transient low-mass X-ray binary
with type II burst phenomenology that makes it unique in the Galaxy. We propose
to obtain high-resolution grating spectra (ACIS-S + HETG) of the RB in outburst.
In one 30 ksec observation we will collect ~150,000 photons from type II bursts
and at least ~90,000 photons from the persistent emission. Spectral features in
the type II bursts and the persistent emission may illuminate the physics of the
accretion process that drives these bursts, perhaps allowing us to finally
understand some of the physics behind this enigmatic object.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:33:24.60  -33:23:19.80  RAPID BURSTER         ACIS-S HETG  30.00

===================================================================================

Proposal Number: 01400700            
Proposal Title: AXAF OBSERVATIONS OF A BRIGHT BLACK HOLE X-RAY BINARY IN
OUTBURST

PI: WALTER LEWIN                   
Subject Category: BH AND NS BINARIES                                

Abstract: We propose to study the X-ray spectra of black-hole (candidate) X-ray
binaries (BHXBs) in outburst. We will follow the outburst throughout its
evolution across all wavelength bands, and will select certain periods for X-ray
spectral analysis with AXAF. High-resolution X-ray spectra of the BHXBs will
likely exhibit emission lines and absorption edges characteristic of the
accretion disk geometry, temperatures, and abundances. We expect that they will
show the general-relativistic effects of the extreme gravitational environment
near the black hole. When possible, we will make (near) simultaneous radio, IR,
optical, X-ray timing (RXTE), and gamma-ray (CGRO-BATSE) observations. Our team
has extensive expertise in all aspects of the proposed research.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:50:58.90  -56:28:35.30  XTE J1550-564 (0.05   ACIS-S HETG   6.00
 15:50:58.90  -56:28:35.30  XTE J1550-564 (OUTBU  ACIS-S HETG   2.00
 15:50:58.90  -56:28:35.30  XTE J1550-564 (OUTBU  ACIS-S HETG   2.00
 15:50:58.90  -56:28:35.30  XTE J1550-564 (OUTBU  ACIS-S NONE   2.00
 15:50:58.90  -56:28:35.30  XTE J1550-564 (OUTBU  ACIS-S HETG   1.20
 15:50:58.90  -56:28:35.30  XTE J1550-564 (OUTBU  ACIS-S HETG   1.20
 15:50:58.90  -56:28:35.30  XTE J1550-564 (OUTBU  ACIS-S NONE   1.20

===================================================================================

Proposal Number: 01400713            
Proposal Title: HETGS STUDY OF PERSISTENT AND BURST EMISSION FROM TWO LUMINOUS
BURSTERS

PI: Jean Swank                     
Subject Category: BH AND NS BINARIES                                

Abstract: Serpens X-1 and 4U 1735-44 are two bursting low-mass X-ray binaries
which have shown confirmed Fe K line emission and less certain evidence of low
energy line emission. Reported variations in Fe K line, energy, and width suggest
that the inner disk region is sometimes the dominant formation region for these
relatively luminous persistent sources at low inclination. Quasiperiodic
oscillations at high frequencies also arise in the inner disk region and
simultaneous RXTE data would correlate temporal behavior, the continuum and
lines. For each source we propose an 80 ksec HETG/ACIS observation likely to
include at least a few bursts. Simultaneous HETG and RXTE burst spectra would
test predicted divergence from black body models and better constrain neutron
star parameters.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:39:57.00  +05:02:06.00  SERPENS X-1           ACIS-S HETG  80.00

===================================================================================

Proposal Number: 01400738            
Proposal Title: RESOLVING LOW ENERGY LINES FROM LMXRB

PI: LORELLA ANGELINI               
Subject Category: BH AND NS BINARIES                                

Abstract: ASCA observations of the LMXRB X0918-54,X1543-62 and X0614+09 reveal
strong emission lines in the 0.5-1 keV band.The emission is consistent with
Oxygen and Iron L,but major uncertanties remain in establishing the line emission
mechanism.The recombination continuum,a signature of photoinonization,is missing
or at lower level in all systems. A collisionial plasma better reproduces the
spectrum. Scattering and 3-body recombinations are other possible mechanism that
can lower the recombination. Observations with the AXAF HETG of the 3 objects can
differentiate line emission with an unprecedented resolving power.This capability
will pin-down the underline mechanism responsible for the line emission, and
define abundances to constrain the system evolution.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:20:26.70  -55:12:23.00  X0918-54              ACIS-S HETG  30.00
 15:47:54.70  -62:34:05.00  X1543-62              ACIS-S HETG  30.00

===================================================================================

Proposal Number: 01400776            
Proposal Title: HIGH RESOLUTION X-RAY SPECTROSCOPY OF COMPACT BINARIES

PI: SAEQA VRTILEK                  
Subject Category: BH AND NS BINARIES                                

Abstract: We propose to undertake a survey of Galactic X-ray binaries with the
ACIS-S+HETG. Owing to their proximity and brightness, X-ray binaries provide
otherwise unobtainable insight into the accretion process. We will: investigate
the physical conditions of the emitting gas using emission and recombination line
diagnostics to determine temperatures, densities, elemental abundances, and
ionization structure; test and improve models of X-ray line emission developed by
us over the past decade; and generate an atlas of spectra for use in comparative
studies of X-ray binaries. Insights gained from this work will be applicable to
irradiated, accreting plasmas which are present in regions of star formation,
interacting main-sequence binaries, active galactic nuclei and quasars.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:31:44.19  -16:57:41.18  4U 1728-16            ACIS-S HETG  20.00
 17:38:58.26  -44:27:00.13  4U 1735-44            ACIS-S HETG  25.00

===================================================================================

Proposal Number: 01400874            
Proposal Title: HIGH RESOLUTION SPECTROSCOPY OF THE STELLAR WIND IN CENTAURUS
X-3

PI: DUANE LIEDAHL                  
Subject Category: BH AND NS BINARIES                                

Abstract: The HMXB Cen X-3 is an eclipsing X-ray pulsar with an O-star companion.
It is the brightest X-ray source in its class. Spectroscopically, the
phase-averaged spectrum is a complex superposition of a bright continuum,
disk-reprocessed emission, and lines from a photoionized wind. The presence of an
accretion disk renders Cen X-3 overluminous relative to Bondi-Hoyle wind
accretion, resulting in a very high level of ionization in the wind. We propose
to observe Cen X-3 during eclipse with the HETG, which will allow us to
spectrally isolate the wind, focusing on its ionization, emission measure
distribution, and velocity structure. To accomplish this, we have developed an
X-ray spectral model that has been successfully applied to ASCA spectra of other
wind-dominated sources.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:21:15.20  -60:37:24.00  CEN X-3               ACIS-S HETG  40.00

===================================================================================

Proposal Number: 01400876            
Proposal Title: HETG ZERO PHASE SPECTROSCOPY OF CIRCINUS X-1

PI: WILLIAM BRANDT                 
Subject Category: BH AND NS BINARIES                                

Abstract: We propose to make the first grating-resolution X-ray spectra of Cir
X-1 during one of its zero phase passages. Our ASCA analyses of Cir X-1 have
shown that its variable iron K features can be explained using a direct flux plus
scattered flux model, and HETG spectra will test our model. During zero phase
`dips' we expect line emission from an accretion disk corona (ADC), since we
predict predominantly ADC scattered emission below 5 keV. Line measurements will
constrain the ADC ionization parameter, temperature, thickness and motion. We
will also make the highest resolution iron K line/edge measurements and use them
to study obscuring matter. Our observation will not cause telemetry saturation,
and our dispersed spectra will not have serious photon pile up.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:20:41.00  -57:10:00.00  CIR X-1               ACIS-S HETG  15.00
 15:20:41.00  -57:10:00.00  CIR X-1               ACIS-S HETG  30.00

===================================================================================

Proposal Number: 01400880            
Proposal Title: THE PHYSICS OF X-RAY LINE EMISSION IN THE MICROQUASAR GRO
J1655-40

PI: DUANE LIEDAHL                  
Subject Category: BH AND NS BINARIES                                

Abstract: We propose a 40 ksec AXAF HETG TOO observation of the microquasar GRO
J1655-40 during outburst. The object shows both radio-loud and radio-quiet X-ray
outbursts, with relativistic jets accompanying the radio outbursts. Clear
evidence for intense emission near 1 keV and complex absorption in the Fe K band,
rare for a black hole candidate, have been observed with ASCA. The HETG can be
used to great advantage here, allowing us to extract detailed line diagnostics
and, through precise measurements of Doppler shifts, identify the possible
relationship of the line component to the jets. GRO J1655-40 represents a unique
opportunity to explore (``up close'') transient outburst accretion physics in a
black hole.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:54:00.10  -39:50:44.90  GRO J1655-40          ACIS-S HETG  40.00

===================================================================================

Proposal Number: 01400882            
Proposal Title: TEMPORAL EVOLUTION OF TRANSIENT TYPE I BURSTERS IN QUIESCENCE

PI: LARS BILDSTEN                  
Subject Category: BH AND NS BINARIES                                

Abstract: We propose TOO monitoring observations with ACIS-S-BI of Aql X-1, the
Rapid Burster, and one other type-I bursting transient in quiescence following an
outburst. Heat deposited in the deep neutron star (NS) crust during outburst
diffuses out on a timescale (about a year) which scales as the fourth power of
the NS radius. Temporal evolution will thus provide an observational handle on
the NS radius. Our data will be analyzed using realistic emergent spectra, thus
obtaining a second, independent radius constraint. We also request one LETG+HRC-S
observation directly after an outburst for Aql X-1 and the "other" object (if it
has a low Av) to search for the 549 Hz pulse period (in Aql X-1) and the possible
presence of metals in the thermal NS atmosphere.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 19:11:16.00  +00:35:06.40  AQL X-1               HRC-S  LETG  10.00
 19:11:16.00  +00:35:06.40  AQL X-1               ACIS-S NONE   8.00
 19:11:16.00  +00:35:06.40  AQL X-1               ACIS-S NONE   8.00
 19:11:16.00  +00:35:06.40  AQL X-1               ACIS-S NONE   8.00
 19:11:16.00  +00:35:06.40  AQL X-1               ACIS-S NONE   8.00

===================================================================================

Proposal Number: 01400884            
Proposal Title: QUIESCENT EMISSION FROM TRANSIENT TYPE I X-RAY BURSTERS

PI: LARS BILDSTEN                  
Subject Category: BH AND NS BINARIES                                

Abstract: Transient type-I X-ray bursters have been previously detected during
``quiescence'', at fluxes much lower than when in outburst. We propose ACIS-S-BI
spectroscopy of six such transients in quiescence, to discover whether their
luminosity is due to the delayed escape of energy deposited in the crust during
the outburst or to low-level advection-dominated accretion. If accretion is
active, we will observe X-ray spectra with a detectable red-shifted oxygen
photo-ionization edge. If accretion is not active, then the faint emission is due
only to a hot crust, and we expect spectra which are consistent with a pure
hydrogen atmosphere, and no rapid variability. In both cases, we will measure the
neutron star surface area (normalized by distance) by utilizing realistic
emergent spectra.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:58:22.00  -31:40:07.50  CEN X-4               ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01400904            
Proposal Title: THE LOCATION OF THE MOST INTENSE UNIDENTIFIED X-RAY SOURCE ON
THE CELESTIAL SPHERE

PI: Bruce Margon                   
Subject Category: BH AND NS BINARIES                                

Abstract: We propose to use the unprecedented X-ray spatial resolution and aspect
determination accuracy of AXAF to obtain the optical/IR identification of what
may be the most intense but as yet unidentified steady X-ray source on the
celestial sphere, GX17+2 (=X1813-140). Although this object is a prototype of the
important Z-sources (which include Sco X-1 and Cyg X-2), evidence is now very
strong that the long-accepted optical identification is incorrect. We have
recently obtained HST NICMOS observations of the field which point the way
towards reopening this perplexing problem of 25 years duration. The proposed
observations will simultaneously provide a high-quality X-ray spectrum.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:16:01.20  -14:02:11.20  GX 17+2               HRC-S  LETG   9.00

===================================================================================

Proposal Number: 01400909            
Proposal Title: AXAF GRATING SPECTRA AND PRECISE POSITIONS OF BRIGHT
GALACTIC-CENTER X-RAY SOURCES

PI: Alan Levine                    
Subject Category: BH AND NS BINARIES                                

Abstract: We propose to observe 7 bright GX sources with the AXAF HETG to (1)
study narrow emission and absorption line features in their spectra which will
help disentangle the different physical processes involved, (2) determine the
source positions to better than 1" accuracy which will greatly improve the
chances of identifying the optical counterparts with future HST observations, and
(3) measure the energy-dependent halo structures surrounding these sources to
probe the composition and size distribution of the intervening interstellar
grains.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:05:44.40  -36:25:25.00  GX 349+2              ACIS-S HETG  10.00
 18:01:08.10  -25:04:45.00  GX 5-1                ACIS-S HETG  10.00
 18:01:32.10  -20:31:44.00  GX 9+1                ACIS-S HETG  10.00

===================================================================================

Proposal Number: 01400942            
Proposal Title: IS GRS 1758-258 REALLY A MICROQUASAR?

PI: WILLIAM HEINDL                 
Subject Category: BH AND NS BINARIES                                

Abstract: We propose a short HRC-I observation to obtain a precise location for
the unusual Galactic black hole candidate and so-called microquasar,
GRS~1758-258. A precise location will either confirm or reject the association of
this X-ray source with the core of a double lobed radio jet structure. It will
also enable deep infrared follow-up observations to search for stellar
companions, and hopefully identify the system as a low or high mass X-ray binary.
Since the source is near the Galactic center, more than a dozen K-band objects
appear in the current best (ROSAT) error circle making identification difficult.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:01:13.20  -25:44:29.00  GRS 1758-258          HRC-I  NONE   1.00

===================================================================================

Proposal Number: 01400903            
Proposal Title: BRIGHT LMXB GLOBULAR CLUSTER SURVEY: NATURE, MASSES AND CLUSTER
DYNAMICS

PI: JONATHAN GRINDLAY              
Subject Category: BH AND NS BINARIES                                

Abstract: We propose to survey the 7 remaining bright LMXBs (using HRC) and 1
quiescent NS-LMXB transient (using ACIS-I) in globular clusters for which
accurate positions are not available. These will enable optical IDs with HST
which then constrain the LMXB mass and evolution. Faint sources can be resolved
with the HRC down to limits which will constrain the bright LMXB luminosity
function. The deeper ACIS observation will measure the dim source content and
qLMXB spectrum. The full 12 cluster LMXB data set can then constrain LMXB masses,
the cluster potential, and dark remnant content of globular cluster cores.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:35:47.81  -30:28:58.08  TERZAN 1              HRC-I  NONE   1.10
 17:50:12.90  -37:03:06.20  NGC 6441              HRC-I  NONE   2.10
 17:50:46.39  -31:16:31.08  TERZAN 6              HRC-I  NONE   3.80
 18:35:43.99  -32:59:29.04  NGC 6652              HRC-I  NONE   1.80

===================================================================================

Proposal Number: 01400007            
Proposal Title: CHEMISTRY OF INTERSTELLAR DUST

PI: PETER PREDEHL                  
Subject Category: BH AND NS BINARIES                                

Abstract: We propose to use Cyg X-2 as a bright 'candle' behind a sufficient
dense column of interstellar matter in order to study absorption and scattering
effects. Energy resolved scattering halos provide a clue to the chemistry of
interstellar dust including the question if grains have a Silicate core and an
organic mantle. Since haloes are not completely observable with a dispersive
instrument, we will use the brightness distribution in cross dispersion direction
for measuring the energy dependent scattering cross section. Cyg X-2 is the
brightest among reasonably absorbed sources (NH > 10**21 cm**-2). We expect about
18 cts/s with HRC-S + LETG more than 500.000 cts within a 30ksec observation,
respectively.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 21:44:40.00  +38:19:14.00  CYG X-2               HRC-I  LETG  30.00

===================================================================================

Proposal Number: 01400046            
Proposal Title: ECLIPSING BINARY X-RAY HALOS AND INTERSTELLAR GRAIN PROPERTIES

PI: GORDON GARMIRE                 
Subject Category: BH AND NS BINARIES                                

Abstract: Study of the X-ray scattered halo around obscured Galactic X-ray
sources can provide insights into the size, density, composition and spatial
distribution of interstellar grains. Eclipsing X-ray binary systems offer unique
advantages, as the evolution of the halo following an abrupt eclipse depends on
the distance and distribution of clouds. A high-resolution spectrum will further
provide rich information on the interstellar matter composition.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:21:15.20  -60:37:24.00  CEN X-3               ACIS-I NONE  40.00
 15:42:23.20  -52:23:10.00  4U 1538-52            ACIS-I NONE  24.00

===================================================================================

Proposal Number: 01400049            
Proposal Title: MEASURING BLACK HOLE SPIN

PI: GORDON GARMIRE                 
Subject Category: BH AND NS BINARIES                                

Abstract: WE PROPOSE TO CARRY OUT A SYSTEMATIC STUDY OF EMISSION AND ABSORPTION
SPECTRAL FEATURES THAT ARE OFTEN SEEN IN X-RAY SPECTRA OF BLACK HOLE BINARIES. 
THE EXCELLENT SENSITIVITY AND ENERGY RESOLUTION OF THE ACIS/HETG COMBINATION WILL
NOT ONLY HELP RESOLVE AMBIGUITIES IN INTERPRETING THESE FEATURES, BUT MAY ALLOW
MODELLING OF THE EMISSION LINE PROFILES IN DETAIL.  THE PROFILES MAY CONTAIN
INFORMATION ON SUCH FUNDAMENTAL PROPERTIES AS THE SPIN OF BLACK HOLES. 
THEREFORE, THIS STUDY COULD LEAD TO A MEASUREMENT OF BLACK HOLE SPIN FOR SELECTED
SOURCES. THE RESULT CAN THEN BE DIRECTLY COMPARED WITH THOSE FROM PREVIOUS
STUDIES BASED ON INDEPENDENT METHODS.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:38:56.40  -64:05:01.50  LMC X-3               ACIS-S HETG  20.00
 05:39:38.80  -69:44:36.10  LMC X-1               ACIS-S HETG  20.00
 17:44:02.60  -29:43:25.00  1E 1740.7-2942        ACIS-S HETG  10.00

===================================================================================

Proposal Number: 01400071            
Proposal Title: BLACK HOLE EVENT HORIZONS

PI: STEPHEN MURRAY                 
Subject Category: BH AND NS BINARIES                                

Abstract: Comparisons of the luminosities of Black Hole (BH) and Neutron Star
X-ray Nova (XN) provide the first direct observational evidence that black holes
have event horizons. Central to the interpretation of this evidence is the
understanding of the accretion flow in X-ray Nova as Advection Dominated
Accretion Flows (ADAFs) when the systems are "quiescent". These observations will
allow qualitative improvement in our ability to test the ADAF (or any other)
model by providing the second high-quality spectrum of a quiescent BHXN, and the
first high-quality spectrum of a short-period BHXN.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 06:22:44.50  -00:20:44.70  A0620-00              ACIS-S NONE  44.00
 20:02:49.60  +25:14:11.30  GS 2000+25            ACIS-I NONE  20.00
 20:24:03.80  +33:52:04.10  V404 CYG              ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01400076            
Proposal Title: SPECTRA AND MASS MEASURE FOR THE ULTRACOMPACT BINARY IN NGC 6624

PI: STEPHEN MURRAY                 
Subject Category: BH AND NS BINARIES                                

Abstract: We propose to obtain HRC-S LETG spectra of the shortest period binary
system know: the11 min WD-NS binary in the globular cluster NGC 6624. This
prototype for the double degenerate binaries is bright enough to obtain high S/N
spectra with the LETG such that phase-resolved spectra can neasure the abundances
in this extreme example of stellar/binary evolution as well as provice the first
measure of a NS mass in an actively accreting LMXB in a globular. Comparison with
statistical measures will allow constraints on both cluster potential and
formation and evolution of thsi exotic system.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:23:40.50  -30:21:40.00  NGC 6624              HRC-S  LETG  10.00

===================================================================================

Proposal Number: 01400125            
Proposal Title: BLACK HOLE EVENT HORIZONS

PI: GORDON GARMIRE                 
Subject Category: BH AND NS BINARIES                                

Abstract: Comparisons of the luminosities of Black Hole (BH) and Neutron Star
X-ray Nova (XN) provide the first direct observational evidence that black holes
have event horizons. Central to the interpretation of this evidence is the
understanding of the accretion flow in X-ray Nova as Advection Dominated
Accretion Flows (ADAFs) when the systems are "quiescent". These observations will
allow qualitative improvement in our ability to test the ADAF (or any other)
model by providing the second high-quality spectrum of a quiescent BHXN, and the
first high-quality spectrum of a short-period BHXN.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:54:00.10  -39:50:44.90  GRO J1655-40          ACIS-S NONE  43.00

===================================================================================

Proposal Number: 01400127            
Proposal Title: OBSERVATIONS OF ACTIVE, COMPACT, LOW-MASS X-RAY BINARIES WITH
LETGS

PI: ALBERT BRINKMAN                
Subject Category: BH AND NS BINARIES                                

Abstract: 2 bright compact low-mass X-ray binaries (Cyg X-3 and X 0614+091) are
selected to study the structure of the accretion region.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 06:17:07.40  +09:08:12.00  X0614+091             HRC-S  LETG  26.00
 20:32:25.50  +40:57:27.70  CYG X-3               ACIS-S HETG   2.00
 20:32:25.50  +40:57:27.70  CYG X-3               ACIS-S HETG  16.00

===================================================================================

Proposal Number: 01400137            
Proposal Title: HETG OBSERVATIONS OF X-RAY BINARIES

PI: CLAUDE CANIZARES               
Subject Category: BH AND NS BINARIES                                

Abstract: Observe lines from the relativistic jets of SS 433; measure elemental
abundances in 4U1626-67, Vela X-1, GX301-2 to test evolutionary scenarios;
measure ISM opacity ; measure the iron line structure in Cyg X-1; and obtain
spectra of X-ray bursts and a possible accretion disk corona in 4U1636-53.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:02:06.80  -40:33:17.00  VELA X-1              ACIS-S HETG  30.00
 12:26:37.60  -62:46:13.00  GX 301-2              ACIS-S HETG  40.00
 16:32:16.70  -67:27:42.00  4U 1626-67            ACIS-S HETG  40.00
 16:40:55.50  -53:45:05.00  4U 1636-53            ACIS-S HETG  30.00
 19:11:49.50  +04:58:58.00  SS 433                ACIS-S HETG  30.00
 19:58:21.71  +35:12:06.30  CYG X-1               ACIS-S HETG   2.50
 19:58:21.71  +35:12:06.30  CYG X-1               ACIS-S HETG  15.00

===================================================================================

Proposal Number: 01400140            
Proposal Title: SPECTROSCOPY OF THE SOFT COMPONENT OF THE X-RAY SPECTRUM OF HER
X-1

PI: PETER PREDEHL                  
Subject Category: BH AND NS BINARIES                                

Abstract: Her X-1 is a neutron star in a binary system, accreting matter from its
stellar companion. The X-ray emission is modulated with the 1.24 s spin period of
the neutron star, the 1.7 d orbital period and an additional 35 d cycle. The hard
X-ray pulses of the neutron star irradiate plasma trapped in its magnetosphere,
where they are partially absorbed and re-emitted at energies less than 1 keV. We
propose to utilize the high spectral resolving power of the AXAF LETG for
detailed phase-resolved spectral studies of the soft X-ray radiation during the
35 d on-state. The observation should start shortly before eclipse egress, when
the X-rays of the neutron star are penetrating the atmosphere of the stellar
companion, to get also information on its structure and ionisation stage.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:57:49.70  +35:20:32.50  HER X-1               HRC-S  LETG  52.00

===================================================================================

Proposal Number: 01400144            
Proposal Title: X-RAY SCATTERING HALO

PI: PETER PREDEHL                  
Subject Category: BH AND NS BINARIES                                

Abstract: This is an observation of the dust-scattered halo from a bright,
strongly-absorbed source.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:01:08.10  -25:04:40.00  GX 5-1                ACIS-S NONE   7.00

===================================================================================

Proposal Number: 01408007            
Proposal Title: TOO OBSERVATION OF THE RELATIVISTIC JET SOURCE CYGNUS X-3

PI: MICHAEL MCCOLLOUGH             
Subject Category: BH AND NS BINARIES                                

Abstract: In Feb 1997, during a major radio flare in Cyg X-3, a 120
milli-arcsecond radio jet, which exhibited relativistic (~0.9 c) expansion, was
observed. Although Chandra would be unable to resolve such a jet, a
high-resolution spectra taken during a major flare may contain Doppler shifted
emission lines revealing the presence of an x-ray jet. Observations of Cyg X-3
during such a flare offers the very interesting possibility of studying the
dynamics of jet formation and propagation through the study of emission lines
with the high spectral resolution afforded by the HETG/ACIS SI configuration. The
20 ks length of the observation permits coverage over one complete 4.8 hour
cycle. A second 20 ks observation 3 days later provides data for studying the
spectral evolution that surely accompanies su

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 20:32:25.50  +40:57:27.70  CYG X-3               ACIS-S HETG  20.00
 20:32:25.50  +40:57:27.70  CYG X-3               ACIS-S HETG  20.00

===================================================================================

Proposal Number: 01408013            
Proposal Title: CHANDRA ACIS/LETG OBSERVATIONS OF THE LEAST ABSORBED X-RAY NOVA:
XTE J1118+48

PI: JEFFREY MCCLINTOCK             
Subject Category: BH AND NS BINARIES                                

Abstract: SCIENCE RATIONALE We propose Chandra grating observations of the X-ray
nova XTE J1118+48. The source was discovered in late March of this year by the
All-Sky Monitor on RXTE (IAUC 7389) and it was identified optically shortly
thereafter (IAUC 7390). This probable black-hole source has a unique and
important characteristic: It is the only X-ray nova (XRN) located at high
galactic latitude (b=+62 deg). Thus it has by far the lowest extinction of any
XRN, making it an exciting target for grating studies with Chandra. The column
density out of the plane in this direction is log(NH) = 20.1 (Dickey and Lockman
1990, A&AS 28, 215). At energies <1 keV very little is known about the properties
of X-ray binaries--especially XRN--because nearly all sources lie at low galactic
latitude and have high

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:18:10.80  +48:02:11.00  XTE J1118+48          ACIS-S LETG  30.00

===================================================================================

Proposal Number: 01408018            
Proposal Title: OBSERVATIONS OF A BLACK HOLE CANDIDATE X-RAY TRANSIENT DURING
OUTBURST DECAY

PI: JOHN TOMSICK                   
Subject Category: BH AND NS BINARIES                                

Abstract: We propose to observe the black hole candidate (BHC) X-ray transient
XTE J1550-564 during outburst decay. We have been observing the decay of the
current outburst with RXTE, and, if the source flux continues its current
exponential decay, it will fall below RXTE detection limits around 2000 July 16.
Chandra observations after July 16 will provide, for the first time, complete
coverage of a BHC X-ray transient decay from outburst to quiescence. Measurements
of the flux and the energy spectrum will address the question of whether there
are major changes in the accretion geometry as the source decays into quiescence
or if the change in X-ray flux is simply due to a drop in the mass accretion
rate. Such information has important implications for ADAF models, which predict
a large change in th

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:50:58.80  -56:28:35.00  XTE J1550-564         ACIS-S NONE   5.00
 15:50:58.80  -56:28:35.00  XTE J1550-564         ACIS-S NONE   5.00
 15:50:58.80  -56:28:35.00  XTE J1550-564         ACIS-S NONE   5.00



***********************************************************************************
SN, SNR AND ISOLATED NS                           
--------------------------------------------------

===================================================================================

Proposal Number: 01500206            
Proposal Title: A STUDY OF ANOMALOUS X-RAY PULSARS

PI: CHRYSSA KOUVELIOTOU            
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The 'anomalous' X-ray pulsars are a small group of very young X-ray
pulsars whose properties (period distribution, X-ray spectra, associations with
supernova remnants, no evidence for binarity) are strikingly different from those
of normal binary X-ray pulsars. Their similarities to soft gamma repeaters
supports the idea that they are strongly magnetized (10^14 G) solitary neutron
stars ('magnetars'). We propose to make AXAF observations to search for small
plerions around them, and to establish the presence of blackbody-like emission
from the neutron star surface, both of which would provide strong evidence for
the magnetar model.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 01:46:22.00  +61:45:00.00  4U 0142+61            ACIS-S NONE   5.00
 01:46:22.00  +61:45:00.00  4U 0142+61            ACIS-S NONE   8.00
 23:01:08.60  +58:52:41.00  1E 2259+586           ACIS-S NONE  12.00
 23:01:08.60  +58:52:41.00  1E 2259+586           ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01500210            
Proposal Title: SPATIAL STRUCTURE OF THE SHRAPNEL INJECTED FROM THE SUPERNOVA
EXPLOSION

PI: HIROSHI TSUNEMI                
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose to observe the shrapnel A of the Vela SNR using the AXAF
ACIS. This is believed to be a raw ejecta produced during the SN explosion. There
are several shrapnels reported. Some of them are observed with ASCA SIS showing
that they show abnormal metal abundance. We selected the shrapnel A, showing Si
rich abundance, since it has enough surface brightness and is rather compact. We
can reveal the compression of matter in its top region while the peel off of
matter in its bottom region. The top region will have some stratification of
matter: the interstellar matter, the circumstellar matter and the Si rich ejecta.
The bottom region will show the Si streak. These can be obtained solely by using
high spatial resolution of AXAF as well as the spectral resolution of ACIS.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:57:39.80  -41:51:46.80  VELA SHRAPNEL A       ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01500290            
Proposal Title: GETTING TO THE HEART OF 3C 58

PI: PATRICK SLANE                  
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: As the youngest member of the pure-plerion class of SNRs, yet with
X-ray and radio properties strikingly different from the Crab Nebula, 3C 58 is
one of the most important remnants in the Galaxy. Studies to date have clearly
revealed a central compact source whose spectrum is compatible with hot polar cap
emission from a neutron star. Broadband studies of 3C 58 show a spectral break
below the IR indicative of a rapid decline in the pulsar output at a recent
epoch. Prior X-ray measurements have been incapable of cleanly separating the
pulsar and nebular spectra. Here we propose an ACIS observation which will
provide us with the first opportunity to accurately measure the X-ray properties
of the central pulsar and to investigate the detailed properties of its
associated nebula.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:05:37.00  +64:49:48.00  3C 58                 ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01500336            
Proposal Title: THE TORTOISE AND THE HARE: AN AXAF STUDY OF TWO COMPOSITE
SUPERNOVA REMNANTS

PI: PATRICK SLANE                  
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: G11.2-0.3 and Kes 73 are two composite SNRs whose properties are
virtually indistinguishable but for one glaring exception. While the thermal
properties of each indicate a young SNR which resulted from a typical explosion
in a somewhat dense medium, the compact central relics produced during the
supernova events are dramatically different. In G11.2-0.3 we find a 65 ms pulsar
driving an extended synchrotron nebula, typical of scenarios for young SNRs from
massive star progenitors. In Kes 73, however, there resides an unresolved source
whose rotation rate is nearly 200 times slower than its would-be cousin in
G11.2-0.3. We propose ACIS imaging, spectral, and timing studies of each remnant
to help us understand the divergent evolutionary paths which have led to these
contrasting objects.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:41:19.00  -04:56:14.00  KES 73                ACIS-S NONE  10.00
 18:41:19.00  -04:56:14.00  KES 73                ACIS-S NONE  30.00

===================================================================================

Proposal Number: 01500408            
Proposal Title: RBS 1223 - A NEW ISOLATED NEUTRON STAR?

PI: GUENTHER HASINGER              
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: In the ROSAT Bright Survey (RBS) We have almost completely optically
identified the brightest 2000 high galactic latitude sources from the ROSAT
All-Sky-Survey Bright Source Catalogue (1RXS). A small number of sources has
empty X-ray error boxes on the POSS plates. HRI follow-up observations of RBS
1223, a very soft object with extreme X-ray to optical flux ratio, confirm a
relatively bright X-ray source with a 1.5 arcsec empty error box on the POSS II
plate and CCD images. Chances are high that this is a new isolated neutron star
(INS). We propose a 10 ksec observation with the AXAF ACIS-S BI in order to i)
obtain a high-quality X-ray spectrum of the source, ii) improve its X-ray
position and iii) look for X-ray pulsations.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:08:48.60  +21:27:08.60  RBS 1223              ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01500505            
Proposal Title: SN1006 AND THE PHYSICS OF SHOCKS

PI: KNOX LONG                      
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: Recent X- and gamma-ray observations show that X-rays from the bright
NE and SW limbs of SN1006 are due mainly to synchrotron radiation from electrons
accelerated at the shock. This explains a very mysterious SNR, and provides the
best evidence of cosmic ray acceleration in SN shocks. Meanwhile, X-rays from the
NW limb of SN1006 appear dominated by thermal emission from an ionizing plasma.
We propose deep ACIS-I observations of the NE and the NW limbs of SN1006 to
better determine the shock conditions in SN1006 and to constrain the fundamental
physics of shocks. SN1006 is unique in that the physics of shocks producing
non-thermal (in the NE) and thermal (in the NW) X-rays can be tested in one
object; furthermore, the spatial scales are well-matched to the angular
resolution of AXAF.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:03:52.00  -41:51:00.00  SN 1006-NE            ACIS-S NONE  75.00

===================================================================================

Proposal Number: 01500525            
Proposal Title: BLAST WAVE DYNAMICS, SUPERNOVA REMNANT ENVIRONMENTS, AND THE
EVOLUTION OF THE CYGNUS LOOP

PI: James Graham                   
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The Cygnus Loop, as the closest, brightest, and best-studied example of
its class, is the prototypical shell supernova remnant (SNR). SNR evolution is
complex because the interstellar medium is inhomogeneous and modified by the
supernova progenitor. We propose to study the interaction of the Cygnus Loop with
its environment and hence elucidate its evolution. X-ray spectroscopy provides
the best tools to quantify the conditions and the microscopic and macroscopic
processes that determine the balance between heating and cooling in shocked gas.
AXAF provides revolutionary capabilities because it offers the first opportunity
to obtain imaging spectroscopy with the combined spatial and spectral resolution
necessary to measure plasma properties on scales relevant to blast wave
gas-dynamics.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 20:46:18.00  +30:58:52.00  CYGNUS LOOP WEST      ACIS-I NONE  30.00
 20:56:14.00  +30:18:42.00  CYGNUS LOOP SE        ACIS-I NONE  47.00

===================================================================================

Proposal Number: 01500526            
Proposal Title: A STUDY OF THE OLD SUPERNOVAE SN1993J, SN1995N, AND SN1996CB

PI: DOUGLAS SWARTZ                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose 50 ks ACIS-I observations of three extragalactic supernovae
aged 1000-2000 days post-explosion in order to study the interaction of supernova
ejecta with circumstellar matter. Each target presents unique observational
opportunities: SN~1993J, whose unprecedented x-ray, radio, and optical evolution
may reflect a complex binary interaction; SN~1995N, the only member of the class
of peculiar Type~II events to be observed at x-ray energies at such an early
evolutionary phase; and SN~1996cb, the only other SN 1993J-like Type~IIb
available for x-ray study. Data will be used to probe the dynamics of the
interaction region; examine the structure of the supernova ejecta and the
circumstellar medium; and to study the late stages of stellar evolution.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:55:25.00  +69:01:12.00  SN 1993J              ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01500527            
Proposal Title: AN AXAF STUDY OF THE NONTHERMAL EMISSION IN G347.5-0.5

PI: PATRICK SLANE                  
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: Recent ASCA observations of G347.5-0.5 reveal bright regions of
nonthermal emission along the rim where the SNR appears to be interacting with an
adjacent cloud. This emission is reminiscent of that seen in SN 1006, where it
appears that electrons have been accelerated to energies up to 100 TeV by the SNR
blast wave. Even more surprisingly, emission from the interior regions appears to
display a featureless nonthermal spectrum as well. Radio observations reveal
emission around much of the shell, with structured emission along the regions of
bright X-ray emission. We propose two AXAF observations of G347.5-0.5 in order to
carry out a detailed study of the structure and spectrum of the bright shell
region and to perform a sensitive search for thermal emission from the interior.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:11:48.00  -39:34:00.00  G347.5-0.5            ACIS-I NONE  30.00
 17:15:16.80  -39:57:36.00  G347.5-0.5            ACIS-I NONE  40.00

===================================================================================

Proposal Number: 01500530            
Proposal Title: SNR 0538-69.1: THE SNR WITH THE FASTEST KNOWN PULSAR

PI: Q. DANIEL WANG                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The remarkable supernova remnant SNR 0538-69.1 in the LMC contains the
recently discovered 16 ms pulsar, the fastest known pulsar associated with a SNR.
This Crab-like remnant consists of three distinct X-ray-emitting components: a
compact source, an unusual elongated feature, and a diffuse emission region. We
propose an HRC observation to pinpoint the location of the pulsar, to conduct
detailed timing analysis, and to resolve the structure of the remnant,
particularly the elongated X-ray feature. This observation, together with an
off-axis ACIS-I pointing and our extensive multiwavelength database of the
region, will allow for a comprehensive study of the structure and evolution of
the remnant and will provide important constraints on pulsar evolution.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:37:47.60  -69:10:20.00  SNR 0538-69.1         HRC-I  NONE  30.00
 05:37:47.60  -69:10:20.00  SNR 0538-69.1         HRC-S  NONE  30.00

===================================================================================

Proposal Number: 01500535            
Proposal Title: THE ENVIRONMENT AND X-RAY COUNTERPART OF 2EG J1811-2339

PI: ROGER ROMANI                   
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: ACIS observations are proposed to disentangle the complex hard X-ray
environment of the bright unidentified gamma-ray source 2EG J1811-2339. ASCA data
have shown a diffuse nonthermal nebula consistent with a plerion and a complex of
X-ray sources coincident with a nearby stellar association. AXAF angular
resolution is needed to isolate a possible pulsar point source in the candidate
plerion, to identify the individual hot stars seen in hard X-rays and to map the
non-thermal emission at fine scales. A modest ACIS exposure accomplishes these
tasks and provides important spectral constraints on the point source components.
This project will shed light on the nature of this GeV source and may identify
the birthsite of its stellar progenitor.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:09:53.80  -23:32:30.00  2EG J1811-2339        ACIS-I NONE  10.00

===================================================================================

Proposal Number: 01500548            
Proposal Title: AXAF IMAGING AND SPECTROSCOPY OF THE SOUTHWEST "V" REGION OF THE
CYGNUS LOOP

PI: Denis Leahy                    
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The Cygnus Loop has been imaged completely in X-rays by the ROSAT PSPC
All-Sky Survey with low spectral resolution. ASCA spectral observations have
yielded interesting results for specific areas of the Cygnus Loop, such as the
northeast rim, which have been modeled by (dynamically) simple non-equilibrium
ionization models. Here a bright region on the southwest rim has been identified
using ROSAT PSPC data which shows the strongest spectral variation in the Cygnus
Loop. The AXAF ACIS-I field of 16 by 16 arcmin is large enough to encompass this
field, allowing spatially resolved spectroscopy which can yield an entirely new
perspective on the state of the plasma and on the dynamics in the Cygnus Loop.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 20:47:14.80  +30:05:22.00  CYGNUS LOOP SW V      ACIS-I NONE  10.00

===================================================================================

Proposal Number: 01500612            
Proposal Title: THE MILLISECOND PULSAR PSR J0437-4715: MAGNETOSPHERE OR
ATMOSPHERE?

PI: GEORGE PAVLOV                  
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: PSR J0437-4715 is the nearest millisecond pulsar, and the only one that
can be studied comprehensively in X-rays. The leading interpretation of its ROSAT
spectrum and energy-dependent pulse shape involves thermal emission from heated
polar caps emitting as a weakly magnetized neutron star atmosphere. Fundamental
parameters such as M/R can be derived if such an interpretation is correct.
ACIS-I, with its good spectral resolution and high-energy response, can confirm
this model and determine the chemical composition of the atmosphere. The HRC-I
will also be used for precise timing relative to the radio pulse, and for
high-resolution imaging of the pulsar, its bow shock, and its possible compact
nebula.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:37:15.78  -47:15:07.91  PSR J0437-4715        ACIS-S NONE  30.00
 04:37:15.80  -47:15:08.20  PSR J0437-4715        HRC-I  NONE  20.00
 04:37:15.80  -47:15:08.20  PSR J0437-4715        HRC-S  NONE  20.00

===================================================================================

Proposal Number: 01500632            
Proposal Title: POSSIBLE EXPLOSION FRAGMENTS IN THE VELA SUPERNOVA REMNANT

PI: PAUL PLUCINSKY                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose two ACIS observations of bullet D in the Vela supernova
remnant, a bright feature which protrudes outside the main blast wave on the east
side of the remnant. Using these observations, we can distinguish between the
bullet picture, in which a fragment of supernova ejecta is now pushing beyond the
blast wave, from a shock break-out picture, in which inhomogeneities in the
ambient medium cause the shock to be non-spherical. Comparison of these AXAF/ACIS
data with existing ultraviolet and optical data from the same region will provide
strong constraints on the models.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:58:48.00  -45:07:12.00  VELA BUL. D WAKE N    ACIS-I NONE  50.00
 09:00:08.16  -45:51:00.00  VELA BULLET D         ACIS-I NONE  30.00

===================================================================================

Proposal Number: 01500634            
Proposal Title: IS THE NERABY ISOLATED NEUTRON STAR RXJ 0720.4-3125 A MAGNETAR?

PI: SHRINIVAS KULKARNI             
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: RXJ 0720.4-3125 is a bright soft X-ray source with a period of 8 s. Our
Keck observations reveal a faint blue optical counterpart. We argue that the
X-ray source must be a nearby neutron star which is either accreting from the ISM
or a cooling magnetar. These two models bear distinctive spectral signatures: in
the first case the surface emission is modified by the accreted gas whereas in
the second case the iron surface is severely affected by super strong magnetic
field strengths. A single LETG/HRC observation will confirm the proposed optical
counterpart and enable us to uncover the nature of the source. Regardless of the
models, this object -- one of the nearest neutron stars with an anomalous period
-- is bound to be fascinating.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 07:20:24.90  -31:25:50.90  RX J0720.4-3125       HRC-S  LETG   5.00
 07:20:24.90  -31:25:50.90  RX J0720.4-3125       HRC-S  LETG   6.00
 07:20:24.90  -31:25:50.90  RX J0720.4-3125       HRC-S  LETG  25.00

===================================================================================

Proposal Number: 01500636            
Proposal Title: THE SOFT GAMMA-RAY REPEATER SGR 1806-20

PI: Gautam Vasisht                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We request a 40-ks ACIS-I exposure towards the soft gamma repeater SGR
1806-20. One of three known repeaters, SGR 1806-20, lies in the core of the
amorphous radio nebula G 10.0-0.3. Its stochastic bursting action and variable
radio activity have been hypothesised to be due to an ultramagnetized neutron
star. So far, little is known about the SGR's quiescent X-ray counterpart
discovered with ASCA due to lack of sensitive high-angular resolution
observations. We argue that these observations will provide the critical insight
(that radio work and past X-ray work could not) needed for better physical
understanding of SGRs

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:08:40.32  -20:24:41.10  SGR 1806-20           ACIS-S NONE   5.00
 18:08:40.32  -20:24:41.10  SGR 1806-20           ACIS-S NONE  33.00

===================================================================================

Proposal Number: 01500637            
Proposal Title: THE X-RAY COUNTERPART OF 5 MARCH 1979

PI: SHRINIVAS KULKARNI             
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The class of soft Gamma-ray Repeater (SGR) 0525-66 remain mysterious to
date. One SGR, 1806-20, has been identified with a plerionic supernova remnant,
with a persistent non-thermal X-ray source. SGR 0526-66 of the 5-March-1979 burst
fame has been localized to the compact supernova remnant N49 in the LMC. Our
sustained campaign with ASCA and ROSAT suggests that the quiescent X-ray
counterpart has a soft X-ray spectrum. This can be inferred in the framework of
the magnetar (highly magnetized neutron stars) model. AXAF medium resolution
spectroscopy is the key to understanding the nature of this mysterious
counterpart. Additionally, ACIS imaging will enable us to search for the expected
synchrotron nebula powered by either the quiescent source (as in 1806-20) or by
past bright bursts.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:26:00.70  -66:04:35.00  SGR 0526-66           ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01500674            
Proposal Title: G29.7-0.3: A SUPERNOVA REMNANT LIKE IT OTTA BE

PI: DAVID HELFAND                  
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: In our quest for an understanding of neutron star birth properties, we
have but two examples of young neutron stars: the Crab and 0540-69 in the LMC. We
seek to find a third in 3C58 (SN1181) in a companion proposal, and may hope to
see a fourth emerge in SN1987A during AXAF's lifetime. Here, we propose to search
for another in G29.7-0.3, a remnant on the other side of the Galaxy which
exhibits an intense central synchrotron nebula surrounded by a bright, 2' shell
of thermal emission. ASCA observations clearly establish the two emission
components, but are completely incapable of spatially resolving them or allowing
the search for a central point source. This object is an AXAF "poster remnant",
an SNR like it otta be.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:46:24.70  -02:58:34.00  G29.7-0.3             ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01500691            
Proposal Title: RADIO-SILENT NEUTRON STARS IN SUPERNOVA REMNANTS

PI: GEORGE PAVLOV                  
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The radio-silent neutron stars in SNRs, 1E 1207.4-5209 in PKS 1209-52
and RX J0821-4300 in Puppis A, provide unique opportunity to study cooling of
young neutron stars and the properties of the superdense matter in their
interiors. The ROSAT and ASCA observations of these objects have been interpreted
in terms of neutron star atmosphere models. We propose AXAF observations to
determine chemical composition, magnetic field and temperature of the
atmospheres, to constrain the neutron star radius and mass, to search for so far
unknown rotation periods and for putative compact nebulae around the neutron
stars. We will also investigate the chemical composition, density, temperature
and ionization state of the diffuse matter in the supernova remanants.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:21:57.50  -43:00:15.70  RX J0822-4300         HRC-I  NONE  18.00
 08:21:57.50  -43:00:15.70  RX J0822-4300         HRC-S  NONE  18.00
 08:21:57.50  -43:00:15.70  RX J0822-4300         ACIS-S NONE  12.00
 12:10:00.80  -52:26:25.00  1E 1207.4-5209        ACIS-S NONE  30.00

===================================================================================

Proposal Number: 01500714            
Proposal Title: SPECTROSCOPY AND TIMING OF THE MIDDLE-AGED PULSAR 1055-52

PI: GEORGE PAVLOV                  
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: PSR 1055-52 is the oldest of 3 middle-aged pulsars from which thermal
radiation has been detected. Its radiation has two components, soft and hard,
with different spectra and pulse profiles. The soft component is emitted from the
entire neutron star surface, while the origin of the hard component (polar caps
or magnetosphere) remains elusive. The spectroscopy and timing of PSR 1055-52
with ACIS-S, interpreted in terms of neutron star atmosphere models, will enable
us to elucidate the nature of the hard component, to determine chemical
composition and distributions of temperature and magnetic field at the neutron
star surface, and to constrain star's mass and radius. A complementing HRC-I
observation will yield a high-resolution image to search for a compact nebula
around the pulsar.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:57:58.80  -52:26:56.30  PSR 1055-52           ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01500762            
Proposal Title: AXAF OBSERVATIONS OF THE "DUCK" PULSAR PSR B1757-24

PI: VICTORIA KASPI                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The young energetic radio pulsar PSR B1757-24 is traveling at high
velocity out of the supernova remnant G5.4-1.2, in the process, re-energizing the
remnant's shell, and powering a synchrotron nebula having dramatic bow-shock
morphology. AXAF observations will determine properties of the pulsar wind that
are unobservable in other systems, and permit detailed study of the unusual
pulsar/remnant interaction. Useful X-ray observations of the PSR
B1757-24/G5.4-1.2 system have been impossible before AXAF, because of the low
predicted count rates for ROSAT, and because of a nearby unrelated bright source
that contaminated the ASCA field. The first X-ray observation of this unique
source has thus awaited the arrival of AXAF, with its high energy response, and
unparalleled spatial resolution.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:01:00.20  -24:51:27.10  PSR B1757-24          ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01500765            
Proposal Title: AXAF OBSERVATIONS OF THE YOUNG, ENERGETIC RADIO PULSAR PSR
B1509-58

PI: VICTORIA KASPI                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: PSR B1509-58 is the second youngest pulsar known in the Galaxy, after
the Crab. It is located in the supernova remnant G320-1.2 (MSH 15-52). The system
consists of multiple components: an expanding shell, an optical nebula, a
pulsar-powered "plerion," and the pulsar itself. With the unparalleled spatial
resolution and high-energy response of AXAF, the PSR B1509-58 system promises to
be the next powerful laboratory for studying the physics of the pulsar wind and
its interaction with its surroundings. In particular, the proposed observations
will establish (i) whether there is a compact component to the plerion or a
Crab-like torus morphology (ii) whether or not a claimed jet from the pulsar
actually exists (iii) what powers the unusual optical nebula.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:13:55.60  -59:08:08.90  G320.4-1.2            ACIS-I NONE  20.00

===================================================================================

Proposal Number: 01500793            
Proposal Title: BOW SHOCK NEBULAE FROM HIGH VELOCITY NEUTRON STARS

PI: James Cordes                   
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose ACIS exposures of high-velocity pulsars that produce
cometary-shaped bowshock nebulae. Several targets are known bowshocks from
previous Halpha or soft X-ray observations, while others are promising targets
based on scaling laws for thermal and synchrotron emission from shocked
interstellar gas and pulsar wind. The high-angular resolution and energy range of
AXAF will allow us to (a) detect shocked gas and calculate, through morphology,
constraints on the direction of motion and gas density; (b) place limits on the
energy spectrum of pulsar-wind particles; (c) address the physics of electron
heating, shock acceleration, and turbulence; and (d) evaluate the role of
magnetic reconnection near the wind-shock interface.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 22:25:52.40  +65:35:33.80  B2224+65              ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01500802            
Proposal Title: TEMPORAL, SPECTRAL, AND SPATIAL CHARACTERIZATION OF PSR B1706-44

PI: John Finley                    
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The young "Vela"-like isolated neutron star PSR B1706-44 is a copious
emitter of high energy radiation. The system is a composite one with the neutron
star embedded in a 27 arcsec compact synchrotron nebula. We are proposing HRC-I
and ACIS-I observations with the aim of: 1) detecting the pulsations from the
young neutron star and phase relating the pulsed light curve to the gamma-ray
light curve; 2) characterizing the morphology of the compact synchrotron nebula
and ascertaining the energetics of the system; and 3) measuring the surface
temperature of the neutron star and the spectrum of the compact nebula. These
observations will help in the understanding of the spindown energy loss and the
thermal evolution of neutron star matter.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:09:42.20  -44:28:57.00  PSR B1706-44          HRC-I  NONE  50.00
 17:09:42.20  -44:28:57.00  PSR B1706-44          ACIS-S NONE  15.00

===================================================================================

Proposal Number: 01500806            
Proposal Title: AXAF OBSERVATIONS OF THE CRAB NEBULA AND PULSAR AND SPECTROSCOPY
OF THE INTERSTELLAR MEDIUM

PI: MARTIN WEISSKOPF               
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose imaging the Crab Nebula and Pulsar to achieve 2 fundamental
objectives uniquely obtainable with AXAF -- (1) high-resolution imaging of
nebular features and (2) measuring (or constraining) the surface temperature of
the underlying neutron star. Imaging the Crab requires use of a grating as a
neutral density filter. Thus our observations will also provide high-resolution
spectroscopy to allow studies of absorption in the interstellar medium, including
Extended X-ray Absorption Fine Structure, and spectral variation within the
Nebula.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:34:32.00  +22:00:52.00  CRAB PULSAR           HRC-S  LETG  50.00
 05:34:32.00  +22:00:52.00  CRAB PULSAR           HRC-S  LETG 100.00

===================================================================================

Proposal Number: 01500826            
Proposal Title: RESOLVING THE QUESTION OF IC443'S HARD EMISSION

PI: JONATHAN KEOHANE               
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: AXAF is ideally suited to investigate the hard X-ray region of the SNR
IC 443, which is currently thought to be X-ray synchrotron radiation as a result
of a particular interaction between a shock and a molecular cloud. Alternate
explanations, such as a pulsar powered nebula, have still not been completely
ruled out. This proposed observation will image the currently unresolved core of
hard emission, map out the hardness ratio to arcsecond resolution and enable
"sliding box" style spectral fitting which can constrain the hard X-ray spectral
index within +/-0.1 with arcminute spatial resolution. This observation is a key
part of a multi-wavelength observing program to investigate the synchrotron
structure of this anomalous region.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 06:17:05.00  +22:21:30.00  IC 443                ACIS-I NONE  10.00

===================================================================================

Proposal Number: 01500832            
Proposal Title: PROMPT AXAF OBSERVATIONS OF NEARBY SUPERNOVAE

PI: WALTER LEWIN                   
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: In many Type II supernovae (SNe), and some SN Ib/c, the interaction
between the SN shock and the circumstellar material shed by the progenitor star
creates a strong reverse shock that becomes extremely luminous in X-rays (> 10^39
erg/sec, 0.1-2.4 keV). The X-ray luminosity can be reasonably predicted by
detecting the accompanying electron synchrotron radio emissions from the shocked
regions. We propose AXAF ToO observations of selected categories of SNe to
substantially increase the number of X-ray detections (currently at nine).
Combined X-ray and radio observations will test theories of the shock mechanism
and provide information on the SN progenitor. In addition X-ray spectra of the
brighter SNe will constrain the physical properties of the reverse shock region
and the SN ejecta.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:41:27.06  -02:51:46.58  SN1999em              ACIS-S NONE  40.00
 04:41:27.06  -02:51:45.70  SN1999em              ACIS-S NONE  40.00
 04:41:27.06  -02:51:45.68  SN1999em              ACIS-S NONE  25.00
 04:41:28.08  -02:51:33.49  SN1999em              ACIS-S NONE  25.00
 04:41:28.26  -02:51:38.35  SN1999em              ACIS-S NONE  25.00
 11:46:06.11  +47:28:55.80  SN1998S               ACIS-S NONE  20.00
 11:46:06.11  +47:28:55.80  SN1998S               ACIS-S NONE  20.00
 11:46:06.11  +47:28:55.80  SN1998S               ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01500847            
Proposal Title: ACIS/HST OBSERVATIONS OF RELATIVISTIC WISPS IN THE CRAB NEBULA

PI: JEFF HESTER                    
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The Crab Nebula offers a unique opportunity to study the physics of
pulsar winds and relativistic plasmas. Comparison of ROSAT and HST observations
reveals a fundamental connection between dynamic optical structure (e.g., wisps
moving at 0.5c) and bright X-ray emission (e.g., the well-known X-ray torus).
This connection is not surprising because both phenomena reflect the short
lifetimes of the most energetic particles in the nebula. In an approved HST
program we will monitor the Crab at 10-day intervals during 8 months in 1998-99.
Here we request 5 AXAF ACIS visits to the Crab during this time. This
X-ray/optical campaign offers a unique opportunity to tie the dynamical structure
of the pulsar wind to the evolution of the particle population which is driving
those dynamics.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:34:31.57  +22:00:56.39  CRAB NEBULA           ACIS-S NONE   2.00
 05:34:31.57  +22:00:56.39  CRAB NEBULA           ACIS-S NONE   2.40
 05:34:31.90  +22:00:52.10  CRAB NEBULA           ACIS-S NONE   1.90
 05:34:31.90  +22:00:52.10  CRAB NEBULA           ACIS-S NONE   1.90
 05:34:31.90  +22:00:52.10  CRAB NEBULA           ACIS-S NONE   2.00

===================================================================================

Proposal Number: 01500850            
Proposal Title: HIGH RESOLUTION LINE SPECTROSCOPY OF THREE YOUNG SUPERNOVA
REMNANTS IN THE LARGE MAGELLANIC CLOUD

PI: STEVEN KAHN                    
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose to observe three young type Ia supernova remnants in the
Large Magellanic Cloud--N103B, 0519-69.0, and 0509-67.5--with the HETGS. Previous
observations have found these remnants to be in nonequilibrium ionization(NEI).
Our goal is to determine the level of ionization nonequilibrium through detailed
line spectroscopy of the 0.5-2.0 keV band, which is rich in lines of K shell Ne,
Mg, and Si, and L shell Fe, and contains powerful diagnostics to constrain NEI
parameters. The HEG is required to resolve these features. To maximize the count
rate, we offset point to place the energy band of interest on the efficient
back-illuminated chip S1. The sources' moderate spatial extent (10-15'') permits
the offset without further degradation of the inherent resolution.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:09:31.90  -67:31:17.10  0509-67.5             ACIS-S HETG  48.00
 05:09:31.90  -67:31:17.10  0509-67.5             ACIS-S HETG  52.00

===================================================================================

Proposal Number: 01500900            
Proposal Title: A SYSTEMATIC STUDY OF LMC SNRS WITH AXAF

PI: JOHN HUGHES                    
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose a systematic study of the X-ray brightest supernova remnants
in the Large Magellanic Cloud (LMC) with the ACIS-I. The specific goals of the
proposal are to (1) derive accurate values of the LMC gas-phase metal abundances;
(2) confirm the existence of newly processed metals in the interiors of
middle-aged SNRs and study the amount and spatial distribution of these ejecta;
(3) find and study power-law X-ray emission components that might arise from
nonthermal distributions of electrons in pulsar-powered synchrotron nebula or
originating through shock acceleration; (4) clarify the evolutionary state of the
remnants to better understand the progenitor stars and their effects on the local
environment.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:05:41.70  -67:52:38.00  DEM 71                ACIS-S NONE  40.00
 05:09:31.90  -67:31:17.00  0509-67.5             ACIS-S NONE  50.00
 05:35:44.10  -66:02:14.00  N63A                  ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01500901            
Proposal Title: AXAF TOO OBSERVATIONS OF TYPE IA SUPERNOVAE

PI: JOHN HUGHES                    
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: One of the major unsolved problems in supernova research concerns the
precise nature of the progenitor systems of Type Ia supernovae. We propose AXAF
target-of-opportunity observations of a bright Ia supernova in order to better
constrain the circumstellar environment of the progenitor and therefore shed
light on the nature of the precursor star. The ability of our team to rapidly
determine if a particular supernova meets our trigger criteria, coupled with the
broadband sensitivity and rapid response of AXAF, means that the proposed
observations will be more than an order of magnitude more sensitive than any
previous ones obtained in any waveband: X-ray, optical, or radio.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
                            SN IA TOO: INITIAL    ACIS-S NONE  20.00
                            SN IA TOO: FOLLOW-UP  ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01500736            
Proposal Title: THE HISTORIC SUPERNOVA REMNANT SYSTEM - G11.2-0.3

PI: VICTORIA KASPI                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose AXAF-ACIS observations of the remnant of the historic
supernova SN 386AD and its associated 65~ms X-ray pulsar, recently discovered in
the direction of the remnant by ASCA. This is only the second association of a
pulsar with a historical supernova, after the Crab. A detection of the pulsar by
AXAF will determine the pulsar spin-down rate - and hence its age, surface
magnetic field and spin-down luminosity. This observation will also provide a
glimpse at a rare, young pulsar-driven plerion and supernova shell system. The
high resolution morphology and spectroscopy of the plerion and shell, possible
only with AXAF, will provide a unique opportunity for investigating the flow
dynamics and composition of a young pulsar's relativistic wind.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:11:29.40  -19:25:25.00  G11.2-0.3             ACIS-S NONE   5.00
 18:11:29.40  -19:25:25.00  G11.2-0.3             ACIS-S NONE  10.00
 18:11:29.40  -19:25:25.00  G11.2-0.3             ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01500003            
Proposal Title: SOFT X-RAY SPECTRUM OF THE OLD NEUTRON STAR RXJ1856.5-3754

PI: PETER PREDEHL                  
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The very soft (57 eV blackbody) and very bright (3.67 ROSAT PSPC
cts/sec) ROSAT source RXJ1856.5-3754 was identified recently by HST as a near-by,
isolated, old, non-pulsating neutron star. The PSPC spectral blackbody fit
indicates a low absorbing column density (correponding to A_V below 0.1 mag), so
that this object most certainly is foreground to the R CrA dark cloud at 130 pc.
With the LETG spectrum, we plan to perform photospheric spectroscopy, i.e. to
check for deviations from a blackbody, e.g. due to a cyclotron emission feature
in the Wien tail, or either a H, He, or Fe atmosphere. From the PSPC count rate,
we can estimate that a 50 ksec AXAF LETG observation will provide sufficient S/N
for distinguishing between these alternatives.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:56:35.30  -37:54:34.40  RX J1856.5-3754       HRC-S  LETG  50.00

===================================================================================

Proposal Number: 01500021            
Proposal Title: ACIS OBSERVATION OF CAS A

PI: STEPHEN HOLT                   
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We will perform a deep ACIS observation of Cas A. The goals of the
observation are to: 1. Produce a broad band map to AXAF's 0.5" intrinsic
resolution. 2. Obtain a hard band continuum map with sufficient signal-to-noise
to determine the morphology of the synchrotron radiation from the shell. 3. Map
out emission from Si, S, Fe lines; look for clumps, or evidence of
stratification. 4. Create detailed Doppler map. 5. Measure the expansion rate of
the X-ray gas by comparison with ROSAT images. 6. Search for neutron star
remnant.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 23:23:26.70  +58:49:03.00  CAS A                 ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01500022            
Proposal Title: ACIS OBSERVATIONS OF TYCHO AND KEPLER

PI: STEPHEN HOLT                   
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We will perform deep ACIS-I observations of the young SNR's Tycho and
Kepler. The goals of these observations are to: 1. Map out emission from the Si,
S, and Fe lines and search for evidence of stratification. 2. Perfrom line
diagnostics to characterize properties of ejecta. 3. Provide a baseline for
proper motion studies. For Tycho, additional goals are: 4. Isolate and
characterize the spectrum of the blast wave. 5. Measure the flux and spectrum of
the hard tail.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:25:27.60  +64:09:14.70  TYCHO SNR             ACIS-S NONE  50.00
 17:30:41.00  -21:29:17.02  KEPLER SNR            ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01500023            
Proposal Title: ACIS OBSERVATION OF W49B

PI: STEPHEN HOLT                   
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We will perform a 50 ks observation of the supernova remnant W49B using
ACIS-I. The goals of this observation are as follows: 1. Measure the flux and
spectrum of the hard tail. 2. Map out the emission from Si, S, Fe and thereby
search for the stratification suggested by ASCA. 3. Determine progenitor type by
measuring relative abundances of observable metals. 4.Obtain the first high
spatial resolution, broad band image. 5. Map temperature and ionization
structure

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 19:11:06.60  +09:05:60.00  W49B                  ACIS-S NONE  55.00

===================================================================================

Proposal Number: 01500024            
Proposal Title: ACIS OBSERVATIONS OF EJECTA DOMINATED MAGELLANIC CLOUD SNR'S

PI: STEPHEN HOLT                   
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We will perform ACIS-I observations of some of the bright, young
supernova remnants in the Magellanic Clouds. Two of these, 0519-69.0 and N103B
have Type Ia progenitors; the other two, E0102-72 and 0540-69.3 are the results
of core collapse explosions. For 0519-67.5, 0102-72, and N103B, our goals are: i.
Measure nucleosynthesis yields via spectral fitting. ii. Look for evidence of
stratification and ionization variation via high resolution, narrow band maps.
For 0540-69.3, are goals are: i.) Obtain spatially resolved spectrum of the
shell, and search for enhanced abundances of Type II nucleosynthesis products.
ii.) Measure the extent of the central plerion.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:19:34.00  -69:02:11.00  0519-69.0             ACIS-S NONE  40.00
 05:40:11.00  -69:19:60.00  0540-69.3             ACIS-S NONE  30.00

===================================================================================

Proposal Number: 01500036            
Proposal Title: HIGH RESOLUTION SPECTRA OF EXTRAGALACTIC SUPERNOVA REMNANTS

PI: CLAUDE CANIZARES               
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: E0102-72 and N132D are the brightest remnants in the SMC and LMC
(respectively) and are the best SNR candidates for grating observations as they
are distant enough to subtend a small angular size yet bright enough to allow
reasonable integration times. The ASCA spectrum of E0102-72 shows lines of
He-like emission from O, Ne, and Mg. The line ratios of these elements cannot be
explained using models with uniform abundances. Previous high-resolution studies
of N132D using the Einstein Focal Plane Crystal Spectrometer (FPCS) have shown an
oxygen overabundance. We plan to use plasma diagnostics of individual emmission
lines to map the temperature, ionization and abundance structures of these two
remnants.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 01:03:60.00  -72:01:56.00  E0102-72.3            ACIS-S HETG  50.00
 01:03:60.00  -72:01:56.00  E0102-72.3            ACIS-S HETG  90.00
 05:25:02.10  -69:38:59.00  N132D                 ACIS-S HETG  22.35
 05:25:02.10  -69:38:59.00  N132D                 ACIS-S HETG  77.65

===================================================================================

Proposal Number: 01500038            
Proposal Title: MONITORING OF SN 1987A

PI: GORDON GARMIRE                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: Over the next decade, the shock front from the supernova explosion SN
1987A in the Large Magellanic Cloud will interact with a comlex environment. The
X-ray emission is likely to brighten and change in various ways as the shock
encounters the dense ring, HII region and red giant wind. Regular monitoring of
the source throughout the duration of the AXAF mission is needed to test models
of remnant evolution, nonequilibrium ionization processes and elemental
abundances.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:35:28.30  -69:16:13.00  SN 1987A              ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01500044            
Proposal Title: THE SUPERNOVA REMNANT AND NEUTRON STAR RCW 103

PI: GORDON GARMIRE                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The Galactic supernova remnant RCW 103 contains a central object that
appears to be a member of the class of radio silent neutron stars. ASCA
observations show that it has a temperature that could be as high as 7 million
degrees, making it the hottest surface seen so far. The data from ASCA are
difficult to interpret unambiguously, however, because the neutron star is not
well separated from the diffuse emission. This ACIS observation will clearly
resolve the neutron star and determine its surface temperature.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:17:36.50  -51:02:26.70  RCW 103               ACIS-S NONE  23.50
 16:17:39.20  -51:01:00.00  RCW 103               ACIS-I NONE  16.50

===================================================================================

Proposal Number: 01500047            
Proposal Title: HIGH RESOLUTION SPECTROSCOPY OF SN 1987A

PI: GORDON GARMIRE                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The nearby supernova SN 1987A provides an unprecedented opportunity to
study the formation of a supernova remnant as the supernova shock front interacts
with the surrounding circumstellar medium. The spectrum obtained here should give
unique information concerning the physical conditions, composition and (through
Doppler broadening) bulk velocity of the X-ray emitting gas. Repeated
observations through the duration of the AXAF mission will trace the complex
evolution of the shock.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:35:28.30  -69:16:13.00  SN 1987A              ACIS-S HETG  35.00
 05:35:28.30  -69:16:13.00  SN 1987A              ACIS-S HETG  75.00

===================================================================================

Proposal Number: 01500054            
Proposal Title: ACIS STUDY OF THE LMC SUPERNOVA REMNANT N103B

PI: GORDON GARMIRE                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: N103B = SNR 509.0-68.7, one of the radio and X-ray brightest supernova
remnants (SNRs) in the LMC, is a remnant of a Type Ia supernova explosion (carbon
deflagration of a white dwarf). One side encounters a giant HII complex while the
other side is freely expanding. With a known distance and low absorption, it
provides an excellent oportunity to explore early SNR evolution. This ACIS
observation will give spatially-resolved spectra. The elemental abundances and
ionization state of the bright X-ray clumps (ejecta?) will be resolved from the
more diffuse shell (blast wave?) emission.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:08:59.00  -68:43:30.00  SNR 509.0-68.7        ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01500055            
Proposal Title: G292.0+1.8: A REMARKABLE OXYGEN-RICH SUPERNOVA REMNANT

PI: GORDON GARMIRE                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: G292.0+1.8, one of the radio-brightest supernova remnants (SNRs) in the
sky, has a shell-type exterior with a plerionic core. Optical high-velocity O-
and Ne-rich filaments are seen near the center. The X-ray morphology is also
composite with a large barlike structure bisecting the shell. The X-ray spectrum
shows both a non-equilibrium ionized plasma with excess metal abundances expected
from a 25 solar mass progenitor, and a hard power-law component likely associated
with the central synchrotron nebula. This ACIS image will elucidate the spatial
distribution of elemental excesses, study dynamics of the X-ray bar with Doppler
shifts, and confirm the presence of a nonthermal nebula.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:24:40.00  -59:16:30.00  SNR 292.0+01.8        ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01500073            
Proposal Title: THE VELA PULSAR

PI: GORDON GARMIRE                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The pulsar PSR B0833-45 inside the Vela supernova remnant is the
youngest and brightest source of thermal X-ray radiation from a neutron star. It
thus provides an important laboratory for study of several expected components:
continuous soft thermal X-ray emission from the cooling neutron star surface,
pulsed hard thermal X-rays from the hot magnetic polar caps, and absorption
features from the highly magnetized atmosphere. This observation will resolve the
Vela pulsar from the surrounding synchrotron nebula, and give a high resolution
spectrum that may reveal the chemical composition of its outer layers, its
surface magnetic field, mass/radius ratio, and polar cap properties. The HRC
detector is used to obtain spectra at different phases within the 89 ms
rotational period.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:35:20.60  -45:10:35.00  VELA PULSAR           HRC-S  LETG  25.00
 08:35:20.70  -45:10:36.00  VELA PULSAR           HRC-S  LETG  25.00
 08:35:20.70  -45:10:36.00  VELA PULSAR           ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01500136            
Proposal Title: SEARCH FOR PULSARS

PI: STEPHEN MURRAY                 
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: Use the high spatial resolution of AXAF/HRC to separate possible
pulsars from surrounding nebular emission. Accurately measure the pulse fraction
and shape of any detected pulsars.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:05:38.00  +64:49:24.00  3C 58                 HRC-I  NONE  29.00
 02:05:38.00  +64:49:24.00  3C 58                 HRC-S  NONE  29.00

===================================================================================

Proposal Number: 01500141            
Proposal Title: HETG OBSERVATIONS OF ISOLATED PULSARS

PI: CLAUDE CANIZARES               
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: We propose to observe two isolated neutron stars which are known to be
pulsars at other wavelengths and are moderately strong X-ray sources. The
objective is to observe spectral absorption features due to Fe atoms in the
stellar atmosphere. The locations and strengths of the absorption features will
be determined in large part by the strength and orientation of the magnetic field
at the neutron surface. The features will be modulated as the star rotates, so we
desire to measure the spectrum as a function of pulse phase.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 06:59:48.10  +14:14:18.60  PSR B0656+14          HRC-S  LETG  40.00
 08:35:20.70  -45:10:38.40  PSR B0833-45          ACIS-S HETG  40.00

===================================================================================

Proposal Number: 01508006            
Proposal Title: SURVEYING THE AFTERMATH OF A STARQUAKE

PI: DAVID HELFAND                  
Subject Category: SN, SNR AND ISOLATED NS                           

Abstract: The Vela pulsar underwent a sudden spinup yesterday morning (Jan 16.3
UT), the largest such event in the thirty years since its discovery. We propose
to take advantage of this fortuitous event by observing the pulsar and its
surrounding synchrotron nebula three times with the Chandra HRC with the goals of
1) discriminating among models for such spinup events, 2) constraining the
equation of state of neutron star matter, and 3) monitoring the effects of the
event on the surrounding synchrotron nebula. The Vela nebula will produce a count
rate of ~3.8 c/s in the HRC-I, and the pulsar's pulsed emission should yield ~
.15 ct/s. Observations of 50 ksec duration will thus yield sensitivities to a 1%
change in the nebula (4 sigma) and a change of 15% in any of 20 phase bins for
the pulse (3 sigm

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:35:20.70  -45:10:35.70  PSR B0833-45          HRC-I  NONE  50.00
 08:35:20.70  -45:10:35.70  PSR B0833-45          HRC-I  NONE  50.00


***********************************************************************************
NORMAL GALAXIES                                   
--------------------------------------------------

===================================================================================

Proposal Number: 01600169            
Proposal Title: THE COMPOSITION OF THE NEAREST STARBURST-DRIVEN GALACTIC WIND

PI: CRYSTAL MARTIN                 
Subject Category: NORMAL GALAXIES                                   

Abstract: Starburst-driven winds and superbubbles play a prominent role in the
chemical evolution of galaxies and the metal enrichment of the intergalactic
medium. In nearby galaxies, enrichment from young star clusters is not detected
in the warm phase of the interstellar medium; but the hot phase could well be a
reservoir for freshly-ejected metals. We propose to measure the metal mass and Fe
to alpha-element ratio in the hot outflow from NGC1569. This dwarf galaxy is
better suited to an enrichment measurement than M82 because the metallicity is
lower (thus larger dZ/Z). The gravitational potential is also shallower. The
abundance of the X-ray halo is currently unknown because of a degeneracy in the
spectral models which we can eliminate by resolving and removing discrete, hard
sources.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:30:49.00  +64:50:54.00  NGC 1569              ACIS-S NONE 100.00

===================================================================================

Proposal Number: 01600191            
Proposal Title: RESOLVING THE MYSTERY OF X-RAY FAINT ELLIPTICAL GALAXIES

PI: CRAIG SARAZIN                  
Subject Category: NORMAL GALAXIES                                   

Abstract: We propose AXAF observations to spatially resolve the emission from
X-ray faint early-type galaxies. Their X-ray emission mechanism is not well
understood. Unlike the X-ray bright ellipticals in which most of the emission is
from hot interstellar gas with T~1 keV, X-ray faint galaxies have hard (~5keV)
and very soft (~0.2keV) spectral components. The hard component is assumed to be
from low mass X-ray binaries (LMXBs), but the origin of the very soft component
is mysterious. We suggested that LMXBs also produce the very soft emission, as it
is seen in nearby LMXBs in our Galaxy and in the bulge of M31. These observations
should resolve the soft and hard emission into individual sources, and will
determine the spectral properties of the LMXBs and/or diffuse thermal gas in
these galaxies.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:16:10.30  -55:46:51.00  NGC 1553              ACIS-S NONE  30.00
 12:48:35.00  -05:47:21.00  NGC 4697              ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01600222            
Proposal Title: STELLAR MASS LOSS VERSUS EXTERNAL ACCRETION IN X-RAY BRIGHT
ELLIPTICALS

PI: CRAIG SARAZIN                  
Subject Category: NORMAL GALAXIES                                   

Abstract: Observations of NGC 5846 and NGC 4649, two X-ray-bright elliptical
galaxies with extended emission line filaments and dust, will be used to study
the interaction between the hot, X-ray emitting gas and cooler interstellar
material. We will determine whether heat conduction into the cooler gas or energy
losses to grains affect the thermal state of the gas. The elemental abundances
and gradients in the hot gas will be derived and compared to the stellar values.
If the gas results from local stellar mass loss, the abundances should be
similar. If there is a cooling flow, the abundances at each radius should reflect
those of stars at larger radii. In these very bright galaxies, inflow of
intergalactic gas may also be important; this would produce low abundances with
only weak gradients.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:43:40.30  +11:32:58.00  NGC 4649              ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01600249            
Proposal Title: THE X-RAY SOURCE POPULATION OF M33

PI: JONATHAN MCDOWELL              
Subject Category: NORMAL GALAXIES                                   

Abstract: AXAF's combined high spatial and spectral resolution and wide bandpass
make it an unrivalled instrument for the study of X-ray source populations in
nearby galaxies. We propose a deep observation of the face-on Local Group spiral
galaxy M33 with the primary goals of classifying the bright X-ray sources and of
making the most sensitive determination yet of the faint source luminosity
function in a late-type spiral. Our secondary goals are to study the M33 hot
interstellar medium, to obtain a detailed spectrum of the nuclear source and to
detect background AGN which may be used as probes of the M33 ISM.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 01:33:50.80  +30:39:36.60  M33                   ACIS-I NONE  50.00
 01:33:50.80  +30:39:36.60  M33                   ACIS-S NONE  50.00
 01:33:50.80  +30:39:36.60  M33 X-8               ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01600275            
Proposal Title: THE NATURE OF PECULIAR GAS FILAMENTS IN EARLY TYPE GALAXIES

PI: GINEVRA TRINCHIERI             
Subject Category: NORMAL GALAXIES                                   

Abstract: We propose to address in detail the nature of unexpected morphological
similarites between different phases of the ISM in early type galaxies. We aim at
obtaining good statistics for detailed morphological comparison in 2 galaxies,
NGC 5846 and NGC 1553, for which ROSAT data have already established a close
relation between warm and hot gas emission, and at a reliable assessing of the
spectral parameters in several regions corresponding to high and low surface
brightness features. This study will enable us to establish which is the causal
link between optical nebulosity, X-ray emisison from hot gas, and dust in
early-type galaxies.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:06:29.40  +01:36:25.00  NGC 5846              ACIS-S NONE  30.00

===================================================================================

Proposal Number: 01600278            
Proposal Title: RESOLVING THE X-RAY EMISSION IN STEPHAN'S QUINTET

PI: GINEVRA TRINCHIERI             
Subject Category: NORMAL GALAXIES                                   

Abstract: Previous x-ray observations of SQ have shown that its emission is very
complex, and suggest that a substantial fraction is most likely caused by the
interaction between group members. With this ACIS-S-BI observation, we aim at a
good morphological study of SQ, which extends at determining whether a truly
diffuse component is present, and at a reliable determination of the spectral
characteristics of some of its components, to gain a proper understanding on the
nature of each component. This has strong implications for our understanding 1)
of the physics of high velocity galaxy collisions (both old and new) and 2) of
the evolutionary history and current state of SQ that may be relevant for the
entire class of S-dominated groups.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 22:36:00.00  +33:58:60.00  HCG 92                ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01600352            
Proposal Title: STARBURSTS AND THE `POLLUTION' OF THE IGM: AXAF OBSERVATIONS OF
THE SUPERWIND FROM NGC 253

PI: TIMOTHY HECKMAN                
Subject Category: NORMAL GALAXIES                                   

Abstract: A popular paradigm is that supernova-driven `superwinds' have
chemically-enriched the IGM and have affected the chemical evolution of galaxies.
We propose to test this idea by measuring the heavy-element content of the
superwind in the prototypical starburst galaxy NGC 253. Prior X-ray data have
demonstrated the spectral/spatial complexity of starbursts, but can not provide
model-independent measurements of abundances. The unprecedented spatial
resolution and good energy resolution of AXAF will finally allow us to determine
chemical abundances in a superwind and determine if the flow will escape the
galaxy. To meet these goals we propose a 120 ks observation of NGC 253 with
ACIS-S, using the high efficiency of the BI chips to obtain high
S/N,spatially-resolved spectra of the hot gas.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:47:20.40  -25:12:24.00  NGC 253               ACIS-S NONE  45.00
 00:47:33.20  -25:17:17.00  NGC 253               ACIS-S NONE  15.00

===================================================================================

Proposal Number: 01600380            
Proposal Title: ELLIPTICALS WITH VERY DISCREPANT GASEOUS & STELLAR ABUNDANCES

PI: RAYMOND WHITE III              
Subject Category: NORMAL GALAXIES                                   

Abstract: We propose AXAF ACIS observations of the two brightest elliptical
galaxies which have very low metal abundance determinations (~0.1 solar) for
their X-ray emitting gas. Both galaxies have high quality optically determined
stellar abundance profiles, indicating ~solar central stellar abundances. The
high spatial and spectral resolution of AXAF ACIS observations will allow us to
directly compare the metal abundance of the X-ray emitting gas to the stellar
metallicity at a range of radii within the optical half light radii. This is a
companion proposal to one in which the target galaxies have a much smaller
disparity in their measured stellar and gaseous abundances.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:40:11.90  -18:34:49.00  NGC 1407              ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01600401            
Proposal Title: PROPOSAL TO STUDY THE HOT GAS INTERIOR OF A SUPERGIANT SHELL IN
THE NEARBY DWARF GALAXY IC 2574

PI: FABIAN WALTER                  
Subject Category: NORMAL GALAXIES                                   

Abstract: We propose to observe a supergiant shell within the nearby (3.2 Mpc)
dwarf galaxy IC 2574. It coincides with a cavity in HI and is surrounded by HII
regions. The region is detected with IRAS, in the radio continuum, with the
EINSTEIN satellite and with ROSAT. It is the most active star forming region in
IC 2574. ROSAT PSPC data (60 counts) suggest that the cavity is filled with a hot
plasma. An AXAF pointed observation with the ACIS-S-BI CCD chip S3 of 10 ksec
integration time is requested to confirm the extended nature of the source, to
determine its thermal spectrum to an accuracy of 10%, and to check for the
contribution from unresolved sources.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:28:44.00  +68:28:10.00  IC 2574               ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01600489            
Proposal Title: X-RAYS FROM NEARBY STARBURST GALAXIES

PI: George Rieke                   
Subject Category: NORMAL GALAXIES                                   

Abstract: We propose to obtain ACIS-I images of the nearby starburst galaxies NGC
253 and NGC 5236 (M83). Detection of supernova remnants and an extended hot wind
will be compared to our GTO NICMOS emission line observations of [FeII] and
H$_2$, showing SN remnants in [FeII] and the interactions of the hot ISM with
molecular matter. The hard X-ray component will be used to identify binaries and
estimate the strength of an inverse Compton component. By comparing the
properties and numbers of the X-ray sources with predictions of evolutionary
starburst models we will constrain the starburst models in a new and powerful
way. In turn, the more accurate starburst models can be used as templates for
starburst evolution studies in general.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:37:00.80  -29:51:58.60  NGC 5236 (M83)        ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01600497            
Proposal Title: GALACTIC FOUNTAINS AND SUPERNOVAE IN NGC 891

PI: JOEL BREGMAN                   
Subject Category: NORMAL GALAXIES                                   

Abstract: Superbubble breakout is thought to be the central process in releasing
metal-rich gas from the disk to the halo of spiral galaxies. Hot X-ray emitting
halos were detected around a few edge-on spirals, lending support to this
picture, although the gaseous mass was less than anticipated. The proposed
observation of the edge-on spiral NGC 891 will answer several fundamental issues:
identifying regions of superbubble breakout; testing whether the gas is flowing
up as a "fountain"; and determining if accretion onto the galaxy occurs. Also, we
can determine the shape of the gravitating mass of this spiral by measuring the
temperature distribution of the halo gas. Finally, we will continue our study of
SN 1986J, defining its evolution and discriminating between competing models.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:22:33.40  +42:20:57.00  NGC 891               ACIS-S NONE  57.00

===================================================================================

Proposal Number: 01600504            
Proposal Title: THE IMPORTANCE OF LOW MASS X-RAY BINARIES TO THE X-RAY EMISSION
FROM SA GALAXY BULGES

PI: JIMMY IRWIN                    
Subject Category: NORMAL GALAXIES                                   

Abstract: The X-ray emission from the bulges of Sa galaxies consists of a hard
5-10 keV component, generally attributed to low mass X-ray binaries (LMXBs) and a
soft 0.2 keV component of unknown origin. It is possible that the soft emission
is from a warm ISM. However, we suggest that the soft emission also results from
LMXBs. AXAF will be able to resolve the soft emission into point sources, and
determine the spectral properties of the brighter LMXBs. Alternatively, if the
soft emission is diffuse, the temperature of the warm gas will be determined. If
Sa bulges are lacking an ISM, this implies that galactic winds have driven the
gas lost from stars out of the galaxy. Since the L_X/L_B values of Sa bulges vary
by a factor of 2, this would also imply there is not a universal stellar L_X/L_B
value.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:17:18.80  -41:06:22.90  NGC 1291              ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01600512            
Proposal Title: THE X-RAY EMISSION OF THE NEARLY PRIMORDIAL BLUE COMPACT DWARF
GALAXY SBS 0335-052

PI: TRINH THUAN                    
Subject Category: NORMAL GALAXIES                                   

Abstract: Embedded in a large HI primordial cloud, with a metallicity of only
Z(Sun)/41 and a stellar population not older than 100 Myr, the blue compact dwarf
galaxy SBS 0335-052 is one of only two known examples of nearby young dwarf
galaxies. The formation of the hot gas phase is one of the most fundamental
processes in the early period of galaxy formation. Thus, its study in a very
metal-deficient environment and during the early evolution phase of a galaxy is
crucial for understanding the X-ray properties of high redshift galaxies. We wish
to study the respective contributions of point sources and diffuse emission to
the X-ray luminosity, the time evolution of the X-ray properties, and check for a
possible galactic wind .

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:37:44.00  -05:02:39.00  SBS 0335-052          ACIS-I NONE  60.00

===================================================================================

Proposal Number: 01600524            
Proposal Title: HOT GASEOUS HALO OF THE EDGE-ON GALAXY NGC 4631

PI: Q. DANIEL WANG                 
Subject Category: NORMAL GALAXIES                                   

Abstract: NGC4631, a nearby edge-on galaxy at a high Galactic latitude, is an
ideal site for studying hot galactic-halo gas and its interplay with various
other galactic components (e.g., magnetic field and extended warm gas features)
involved in disk/halo interaction. We propose an AXAF ACIS observation to obtain
spatially-resolved spectroscopic data. Complemented by our extensive
multiwavelength database on the galaxy, the data will enable us to study the
structure, ionization status, and energy balance of the hot gas as well as its
role in disk/halo interaction.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:42:07.30  +32:32:30.00  NGC 4631              ACIS-S NONE  60.00

===================================================================================

Proposal Number: 01600541            
Proposal Title: THE INTERPLAY BETWEEN THE DIFFERENT COMPONENTS OF THE
INTERSTELLAR MEDIUM OF ELLIPTICAL GALAXIES

PI: Paul Goudfrooij                
Subject Category: NORMAL GALAXIES                                   

Abstract: We propose to obtain deep ACIS-S-BI CCD data of the X-ray bright
elliptical galaxy NGC 5044 which also exhibits extensive optical emission-line
filaments and dust patches. These data will not only significantly improve on the
morphological study of the X-ray emission of elliptical galaxies at higher
spatial resolution than that available to date, but will also allow a study of
the spectral characteristics of the X-ray emission on very small and interesting
scales, which will allow us for the first time to study the physical nature of
the connection between the different phases of the interstellar medium of
elliptical galaxies.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:15:24.00  -16:23:06.40  NGC 5044              ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01600680            
Proposal Title: HOT AND COLD GAS, DARK MATTER, AND HEAVY ELEMENTS IN ELLIPTICAL
GALAXIES

PI: CHRISTINE JONES                
Subject Category: NORMAL GALAXIES                                   

Abstract: We propose to observe NGC1395, a low X-ray luminosity, "normal"
elliptical (E2) galaxy with a rotation velocity of ~100 km/sec to address four
fundamental questions. How much dark matter is in its halo? What is the source of
the ``hard'' spectral component found in ASCA observations of elliptical
galaxies? What are the heavy element abundances in the X-ray gas, what is the
abundance distribution, and what do these imply about the supernova enrichment
history? Do central cooling flows occur in low luminosity, rotating galaxies?

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:38:29.60  -23:01:40.00  NGC 1395              ACIS-I NONE  30.00

===================================================================================

Proposal Number: 01600773            
Proposal Title: FIRST OBSERVATIONS OF A LYMAN BREAK GALAXY AT X-RAY WAVELENGTHS

PI: OMAR ALMAINI                   
Subject Category: NORMAL GALAXIES                                   

Abstract: We propose a deep (50ks) ACIS observation of the z=2.72 Lyman break
galaxy cB58. Gravitational lensing by the foreground galaxy cluster MS1512 has
boosted the flux by a factor of 40, allowing this high redshift galaxy to be
studied in exquisite detail. The unique imaging capabilities of AXAF will enable
us to derive the X-ray luminosity, which in turn will give an independent measure
of the star formation rate. Comparison with the far-UV luminosity will then
provide the first reliable determination of the UV attenuation by dust. This will
allow an estimate of the correction to the comoving star formation rate at z~3.
The soft X-ray spectrum may also allow us to place an upper limit on the neutral
hydrogen column density and hence constrain the metallicity of the interstellar
gas.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:14:22.30  +36:36:25.80  CB 58                 ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01600868            
Proposal Title: THE EVOLUTION OF ISOLATED ELLIPTICAL GALAXIES

PI: ANN ZABLUDOFF                  
Subject Category: NORMAL GALAXIES                                   

Abstract: We propose to observe four galaxies from a unique sample of 21 nearby,
isolated ellipticals for which we have extensive optical and IR data. Our project
has two broad goals: (1) to determine the X-ray properties of isolated
ellipticals and compare them with ellipticals in the richer environments of
groups and clusters and (2) to search for a diffuse X-ray halo characteristic of
an intragroup medium which would provide direct evidence that ellipticals can
evolve from the merger of poor groups. AXAF will provide us with the spatial and
spectral resolution necessary to study how the X-ray luminosity, temperature, and
metallicity vary within such galaxies and their halos.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:52:51.60  -01:16:32.80  NGC 1132              ACIS-S NONE  15.00
 23:19:47.30  +42:51:07.70  NGC 7618              ACIS-S NONE  17.00

===================================================================================

Proposal Number: 01600473            
Proposal Title: ACIS STUDY OF ABUNDANCE DISTRIBUTION IN ES

PI: ALEXIS FINOGUENOV              
Subject Category: NORMAL GALAXIES                                   

Abstract: We propose to measure the heavy element abundance distributions for a
bright elliptical galaxy NGC5846 and a ram-pressure stripped elliptical in the
Virgo cluster, NGC4374 (M84). The AXAF spatial resolution and sensitivity will
allow a direct comparison of stellar abundances measured optically with X-ray
measurements for the hot corona. These observations will determine the relative
contributions to the enrichment of the ISM from different types of supernovae.
These measurements also will test various chemical enrichment scenarios.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:25:03.60  +12:53:14.10  NGC 4374 (M84)        ACIS-S NONE  30.00

===================================================================================

Proposal Number: 01600932            
Proposal Title: DIFFUSE X-RAY EMISSION FROM NEARBY SPIRAL GALAXIES

PI: WILTON SANDERS                 
Subject Category: NORMAL GALAXIES                                   

Abstract: Our primary goal is to characterize the spatial distribution and
spectral characteristics of the hot interstellar plasma in spiral galaxies. Since
it is difficult to see soft X-rays coming from distances > ~ 100 pc from the Sun
in the disk of our Galaxy, we propose to observe the hot interstellar plasma in
several nearby face-on spiral galaxies. The hot phase of the interstellar medium
of normal spiral galaxies is not well characterized or understood, but if the
local filling fraction is representative of the Galactic value, its role is
fundamental in the evolution of the interstellar medium. A secondary goal is to
constrain the cosmological extragalactic diffuse background below 0.5 keV by
quantifying its absorption by these intervening galaxies.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:18:16.00  +41:25:24.00  NGC 3184              ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01600963            
Proposal Title: DIFFUSE HOT GAS IN THE EXTREMELY METAL-POOR GALAXY I ZW 18

PI: DOMINIK BOMANS                 
Subject Category: NORMAL GALAXIES                                   

Abstract: I Zw 18 is the most metal-poor galaxy known so far. It was interpreted
as a young galaxy, which is incompatible with its recently observed high carbon
abundance. Kpc-sized expanding shells and the newly detected extended X-ray
emission indicate that I Zw 18 is experiencing a large scale outflow of gas into
its halo. If it can be shown, that the metals created by the starburst are locked
in the hot gas, the evolutionary state of I Zw 18 could be understood. We propose
an AXAF study of I Zw 18 using ACIS-S to accurately determine the properties of
the diffuse hot gas in I Zw 18 and its halo. Combined with HST data on the warm
ionized gas and stellar content, this will sensitively probe the evolutionary
state of I Zw 18 and test the galactic wind paradigm of dwarf galaxy evolution.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:34:02.00  +55:14:28.00  I ZW 18               ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01600030            
Proposal Title: THE DETAILED X-RAY SPECTRA OF ELLIPTICAL GALAXIES

PI: CLAUDE CANIZARES               
Subject Category: NORMAL GALAXIES                                   

Abstract: We propose to observe two elliptical galaxies NGC1399 and NGC4486 with
the HETGS. Hot gas trapped in the potential well of elliptical galaxies is known
to emit X-rays with a temperature that is characteristic of the depth of the
potential. Cool (~1 keV) X-ray plasmas are rich in emission lines which will
allow us to determine the physical state of the ISM. The temperature and
abundance of the hot gas will be determined. The relative abundances of Fe and
the alpha-process elements will allow us to determine the relative rate of Type I
& Type II SNe supernova. In addition, X-ray emission from any nuclear sources
will also be examined.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:38:29.30  -35:27:01.00  NGC 1399              ACIS-S HETG  15.00
 03:38:29.30  -35:27:01.00  NGC 1399              ACIS-S HETG  15.00
 03:38:29.30  -35:27:01.00  NGC 1399              ACIS-S HETG  43.00
 12:30:49.30  +12:23:28.00  NGC 4486              ACIS-S HETG  40.00

===================================================================================

Proposal Number: 01600040            
Proposal Title: ACIS IMAGING OF SGR A* AND THE GALACTIC CENTER

PI: GORDON GARMIRE                 
Subject Category: NORMAL GALAXIES                                   

Abstract: The Galactic Center is an extremely complex region with extremely high
stellar densities, high-mass star formation, highly sheared motions and magnetic
fields, and probably a massive black hole. Past X-ray observations have not had
sufficient resolution or sensitivity to clearly discriminate the various emitting
structures. This ACIS observation has the high energy response to penetrate the
large column densities, the resolution to achieve extremely high sensitivity to
an active galactic nucleus and detect a variety of stellar sources.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:45:40.00  -29:00:28.00  SGR A*                ACIS-I NONE  50.00

===================================================================================

Proposal Number: 01600057            
Proposal Title: MONITORING M31

PI: STEPHEN MURRAY                 
Subject Category: NORMAL GALAXIES                                   

Abstract: By monitoring M31 on a monthly basis we will be able to detect
transients and follow thier evolution. Follow-up visits to newly discovered
transients will be planned in order to monitor their spectral evolution during
decay. These observations will provide a detailed look at the transient
population of the nearest galaxy similar to the milky way.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:40:27.00  +40:40:12.00  M31 - South 2         HRC-I  NONE   1.00
 00:40:27.00  +40:40:12.00  M31 - South 2         HRC-I  NONE   1.00
 00:40:27.00  +40:40:12.00  M31 - South 2         HRC-I  NONE   1.00
 00:40:27.00  +40:40:12.00  M31 - South 2         HRC-I  NONE   1.00
 00:40:27.00  +40:40:12.00  M31 - South 2         HRC-I  NONE   1.00
 00:40:27.00  +40:40:12.00  M31 - South 2         HRC-I  NONE   1.00
 00:40:27.00  +40:40:12.00  M31 - South 2         HRC-I  NONE   1.00
 00:40:27.00  +40:40:12.00  M31 - South 2         HRC-I  NONE   1.00
 00:40:27.00  +40:40:12.00  M31 - South 2         HRC-I  NONE   1.00
 00:40:27.00  +40:40:12.00  M31 - South 2         HRC-I  NONE   1.00
 00:40:27.00  +40:40:12.00  M31 - South 2         HRC-I  NONE   1.00
 00:40:27.00  +40:40:12.00  M31 - South 2         HRC-I  NONE   1.00
 00:42:08.00  +40:55:17.00  M31 - South 1         HRC-I  NONE   1.00
 00:42:08.00  +40:55:17.00  M31 - South 1         HRC-I  NONE   1.00
 00:42:08.00  +40:55:17.00  M31 - South 1         HRC-I  NONE   1.00
 00:42:08.00  +40:55:17.00  M31 - South 1         HRC-I  NONE   1.00
 00:42:08.00  +40:55:17.00  M31 - South 1         HRC-I  NONE   1.00
 00:42:08.00  +40:55:17.00  M31 - South 1         HRC-I  NONE   1.00
 00:42:40.80  +40:51:54.00  M31 - South 1         HRC-I  NONE   1.00
 00:42:40.80  +40:51:54.00  M31 - South 1         HRC-I  NONE   1.00
 00:42:40.80  +40:51:54.00  M31 - South 1         HRC-I  NONE   1.00
 00:42:40.80  +40:51:54.00  M31 - South 1         HRC-I  NONE   1.00
 00:42:40.80  +40:51:54.00  M31 - South 1         HRC-I  NONE   1.00
 00:42:40.80  +40:51:54.00  M31 - South 1         HRC-I  NONE   1.00
 00:42:44.40  +41:16:08.30  M31 - CENTER          HRC-I  NONE   1.00
 00:42:44.40  +41:16:08.30  M31 - CENTER          HRC-I  NONE   1.00
 00:42:44.40  +41:16:08.30  M31 - CENTER          HRC-I  NONE   1.00
 00:42:44.40  +41:16:08.30  M31 - CENTER          HRC-I  NONE   1.00
 00:42:44.40  +41:16:08.30  M31 - CENTER          HRC-I  NONE   1.00
 00:42:44.40  +41:16:08.30  M31 - CENTER          HRC-I  NONE   1.00
 00:42:44.40  +41:16:08.30  M31 - CENTER          HRC-I  NONE   1.00
 00:42:44.40  +41:16:08.30  M31 - CENTER          HRC-I  NONE   1.00
 00:42:44.40  +41:16:08.30  M31 - CENTER          HRC-I  NONE   1.00
 00:42:44.40  +41:16:08.30  M31 - CENTER          HRC-I  NONE   1.00
 00:42:44.40  +41:16:08.30  M31 - CENTER          HRC-I  NONE   1.00
 00:42:44.40  +41:16:08.30  M31 - CENTER          HRC-I  NONE   5.00
 00:44:07.00  +41:43:16.00  M31 - North 1         HRC-I  NONE   0.65
 00:44:07.00  +41:43:16.00  M31 - North 1         HRC-I  NONE   1.00
 00:44:07.00  +41:43:16.00  M31 - North 1         HRC-I  NONE   1.00
 00:44:07.00  +41:43:16.00  M31 - North 1         HRC-I  NONE   1.00
 00:44:07.00  +41:43:16.00  M31 - North 1         HRC-I  NONE   1.00
 00:44:07.00  +41:43:16.00  M31 - North 1         HRC-I  NONE   1.00
 00:44:07.00  +41:43:16.00  M31 - North 1         HRC-I  NONE   1.00
 00:44:07.00  +41:43:16.00  M31 - North 1         HRC-I  NONE   1.00
 00:44:07.00  +41:43:16.00  M31 - North 1         HRC-I  NONE   1.00
 00:44:07.00  +41:43:16.00  M31 - North 1         HRC-I  NONE   1.00
 00:44:07.00  +41:43:16.00  M31 - North 1         HRC-I  NONE   1.00
 00:44:07.00  +41:43:16.00  M31 - North 1         HRC-I  NONE   1.00
 00:45:20.00  +41:49:47.00  M31 - North 2         HRC-I  NONE   1.00
 00:45:20.00  +41:49:47.00  M31 - North 2         HRC-I  NONE   1.00
 00:45:20.00  +41:49:47.00  M31 - North 2         HRC-I  NONE   1.00
 00:45:20.00  +41:49:47.00  M31 - North 2         HRC-I  NONE   1.00
 00:45:20.00  +41:49:47.00  M31 - North 2         HRC-I  NONE   1.00
 00:45:20.00  +41:49:47.00  M31 - North 2         HRC-I  NONE   1.00
 00:45:20.00  +41:49:47.00  M31 - North 2         HRC-I  NONE   1.00
 00:45:20.00  +41:49:47.00  M31 - North 2         HRC-I  NONE   1.00
 00:45:20.00  +41:49:47.00  M31 - North 2         HRC-I  NONE   1.00
 00:45:20.00  +41:49:47.00  M31 - North 2         HRC-I  NONE   1.00
 00:45:20.00  +41:49:47.00  M31 - North 2         HRC-I  NONE   1.00
 00:45:20.00  +41:49:47.00  M31 - North 2         HRC-I  NONE   1.00

===================================================================================

Proposal Number: 01600058            
Proposal Title: M31 MONITORING (FOLLOWUP)

PI: STEPHEN MURRAY                 
Subject Category: NORMAL GALAXIES                                   

Abstract: By monitoring M31 on a monthly basis we will be able to detect
transients and follow thier evolution. Follow-up visits to newly discovered
transients will be planned in order to monitor their spectral evolution during
decay. These observations will provide a detailed look at the transient
population of the nearest galaxy similar to the milky way.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:42:40.80  +40:51:54.00  M31 TRANSIENT TBD     ACIS-S NONE   5.00
 00:42:40.80  +40:51:54.00  M31 TRANSIENT TBD     ACIS-S NONE   6.10
 00:42:40.80  +41:15:54.00  M31 TRANSIENT TBD     ACIS-S NONE   5.00
 00:42:44.40  +41:16:08.30  M31 TRANSIENT TBD     ACIS-I NONE   3.92
 00:42:44.40  +41:16:08.30  M31 TRANSIENT TBD     ACIS-I NONE   4.00
 00:42:44.40  +41:16:08.30  M31 TRANSIENT TBD     ACIS-I NONE   5.00
 00:42:44.40  +41:16:08.30  M31 TRANSIENT TBD     ACIS-I NONE   5.00
 00:42:44.40  +41:16:08.30  M31 TRANSIENT TBD     ACIS-I NONE   5.00
 00:42:44.40  +41:16:08.30  M31 TRANSIENT TBD     ACIS-I NONE   5.00
 00:42:44.40  +41:16:08.30  M31 TRANSIENT TBD     ACIS-I NONE   5.00
 00:42:44.40  +41:16:08.30  M31 TRANSIENT TBD     ACIS-S NONE   5.00
 00:42:44.40  +41:16:08.30  M31 TRANSIENT TBD     ACIS-S NONE   5.00
 00:42:44.40  +41:16:08.30  M31 TRANSIENT TBD     ACIS-I NONE  10.00

===================================================================================

Proposal Number: 01600062            
Proposal Title: THE ANTENNAE

PI: STEPHEN MURRAY                 
Subject Category: NORMAL GALAXIES                                   

Abstract: We will obtain an ACIS-S spectral image of the Antennae
(NGC4038/NGC4039). This interacting galaxy pair shows complex ROSAT HRI emission,
and contains 12 sources. ASCA shows that at least two spectral components are
present. ACIS-S spectra and imaging will determine the nature of these sources
and of the diffuse emission. This exposure will give 500 counts in each HRI
source, sufficient for a spectrum.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:01:53.70  -18:52:35.50  NGC 4038/NGC 4039     ACIS-S NONE  74.00

===================================================================================

Proposal Number: 01600065            
Proposal Title: NGC5128: BINARY SOURCES IN THE NEAREST ELLIPTICAL GALAXY

PI: STEPHEN MURRAY                 
Subject Category: NORMAL GALAXIES                                   

Abstract: NGC5128, the host galaxy of the Cen A, is the nearest elliptical
galaxy, and the only one in which individual binary X-ray sources can be detected
(and then only by AXAF). This allows a unique way to discriminate the hot ISM
from the binary source contribution to elliptical galaxy emission. The absorption
of the nuclear spectrum by the dust lane will provide diagnostics of the
composition and ionization state of the absorber. The X-ray/radio jet is the
closest powerful example of its kind. A detailed X-ray map will explicate jet
physics, and will again serve to study the galaxy ISM through the jet
interaction.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:25:27.61  -43:01:08.90  NGC 5128              ACIS-I NONE  37.00
 13:25:27.61  -43:01:08.90  NGC 5128              ACIS-I NONE  37.00

===================================================================================

Proposal Number: 01600133            
Proposal Title: EARLY TYPE GALAXIES

PI: STEPHEN MURRAY                 
Subject Category: NORMAL GALAXIES                                   

Abstract: A study of the mass distribution, gas, dark halos, and elemental
abundances of early type elliptical galaxies.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 01:23:39.00  +33:15:24.00  NGC 507               ACIS-S NONE  29.00
 12:26:12.00  +12:56:60.00  NGC 4406              ACIS-S NONE  14.50
 12:26:12.00  +12:56:60.00  NGC 4406              ACIS-S NONE  14.50

===================================================================================

Proposal Number: 01600145            
Proposal Title: BRIGHT ELLIPTICAL GALAXIES AND HIGH REDSHIFT CLUSTERS

PI: RICHARD MUSHOTZKY              
Subject Category: NORMAL GALAXIES                                   

Abstract: The program consists of 1) detailed spatially resolved spectra of
bright elliptical galaxies and 2) deep images of high redshift cluster candidates
NGC4472,NGC4636 and NGC 4472 are 3 of the brightest x-ray elliptical galaxies.
The AXAF exposure times with ACIS-S are set to derive temperature and abundance
profiles for >3 annuli inside the deVacouleurs radius allowing a direct
comparison of the gas and stellar abundances and the gas and stellar
temperatures. These deep exposures should also detect numerous x-ray binaries in
these galaxies.  3C324 is a z=1.2 cluster that is the most distant x-ray cluster
known. The S-Z cluster 1312+42 is one of two objects for which a significant
Sunyaev-Zeldovich decrement is measured but for which there is no optical cluster
visible.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:38:29.40  -35:27:00.40  NGC 1399              ACIS-I NONE   3.50
 03:38:29.40  -35:27:00.40  NGC 1399              ACIS-I NONE   3.78
 03:38:29.40  -35:27:00.40  NGC 1399              ACIS-S NONE  60.00
 12:29:46.90  +08:00:13.00  NGC 4472              ACIS-I NONE  10.00
 12:29:46.90  +08:00:13.00  NGC 4472              ACIS-S NONE  40.00
 12:42:49.70  +02:41:17.00  NGC 4636              ACIS-S NONE  50.00
 12:42:49.70  +02:41:17.20  NGC 4636              ACIS-I NONE  10.00
 13:12:21.40  +42:41:21.00  S-Z CLUSTER           ACIS-S NONE 100.00
 15:49:48.81  +21:25:37.90  3C 324                ACIS-S NONE  45.00


***********************************************************************************
ACTIVE GALAXIES AND QUASARS                       
--------------------------------------------------

===================================================================================

Proposal Number: 01700171            
Proposal Title: THE CENTAURUS A FILAMENTS: PROBING A JET/ISM INTERACTION

PI: IAN EVANS                      
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The nearby radio galaxy Centaurus A contains the closest extragalactic
jet that can be studied in X-rays. In particular, the Cen A filaments offer a
unique laboratory to investigate the detailed physics of the interaction of a jet
of relativistic plasma with a dense cloud in the interstellar medium of the
galaxy. We intend to prove whether the optical filamentary emission is excited by
radiative shocks or by the UV radiation from the nuclear source. The predicted
X-ray emission from the fast shock model is just below the sensitivity limit of
previous searches, and is expected to be concentrated into thin filamentary
sheets. If X-rays remain undetected by this measurement, the excitation mechanism
has to be due to hard photons.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:26:03.70  -42:57:08.20  CEN A FILAMENTS       HRC-I  NONE  60.00

===================================================================================

Proposal Number: 01700178            
Proposal Title: IN SEARCH OF THE CENTRAL ENGINES OF LINERS

PI: MICHAEL ERACLEOUS              
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: Low-ionization nuclear emission regions (LINERs) are quite common,
occuring in at least 1/3 of all galaxies, and more frequently in specific galaxy
types. The nature of the undrlying power source remains controversial since
photionization from a low-luminosity AGN, photoionization by hot stars, and shock
ionization are all plausible excitation mechanisms of the line-emitting gas.
LINERs may well be a heterogeneous population. We propose to observe a small
sample of 4 such objects with ACIS-I to address the question of their power
source. We will exploit the ability of AXAF to deliver high-resolution X-ray
images as well as spatially resolved spectra up to 10 keV to test the competing
scenarios.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:37:43.50  +11:49:04.90  NGC 4579              ACIS-S NONE  35.00
 12:50:53.10  +41:07:13.70  NGC 4736              ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01700217            
Proposal Title: ACIS-I OBSERVATIONS OF THE MOST X-RAY LUMINOUS DWARF SEYFERT
GALAXY MRK 273X

PI: XIAOYANG XIA                   
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: Mrk 273 is an ultraluminous IRAS galaxy undergoing a major merger. A
unique soft X-ray source Mrk 273x, 1.3' to the northeast of Mrk 273, was
discovered by us. The optical counterpart is a nucleated dwarf galaxy with strong
emission lines, typical for Seyfert galaxies. The X-ray luminosity is more than
two orders of magnitude higher than that from any other dwarf galaxy. We propose
to observe the Mrk 273 system with a 50ksec exposure using the ACIS imaging
array, centered on the dwarf Seyfert galaxy. The observation will be used to
study the spatial distribution, spectral shape and time variability of Mrk 273x
and Mrk 273. Understanding of this system has important implications for the
formation of nucleated dwarf galaxies and, if such sources are common, the cosmic
X-ray background.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:44:47.50  +55:54:10.00  MRK 273X              ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01700250            
Proposal Title: MAPPING HIGH-VELOCITY SHOCKS ALONG THE JETS OF NGC 4258

PI: GERALD CECIL                   
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: A deep HRC-S+LETG image will be made of the twisted, X-ray emitting
jets of NGC 4258. The X-ray jets are 3.5-arcmin long, several arcsecs wide, and
are prominent in radio continuum, optical emission line, and soft X-ray images.
They are known to have thermal X-ray spectra, kinematical discontinuities, and
gaseous excitation consistent with high-velocity (500-700 km/s) entraining
shocks. Our AXAF grating exposure will have sufficient counts and spectral
resolution to establish shock velocities and gas abundances at a dozen points in
the jet flow. These data will be used to constrain the time evolution of the
outflow, and hence the dynamical evolution of the AGN. There will be general
insights on jet entrainment and shock physics in other astrophysical contexts.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:19:01.00  +47:17:60.00  NGC 4258              HRC-S  LETG 150.00

===================================================================================

Proposal Number: 01700320            
Proposal Title: THE XUV SPECTRUM OF SEYFERT 1 GALAXIES

PI: TRACEY TURNER                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We request AXAF observations of TON S180 & Mkn 279, for which FUSE time
is guaranteed as part of the PI program. We propose simultaneous FUSE, AXAF &
STIS observations to resolve the conflict between the steep EUV continuum derived
from composite spectra of QSOs and the weakness of the He II lines then predicted
by photoionization models. These observations will also test the claim that the
intrinsic XUV spectra of narrow-line and normal Seyfert 1 galaxies differ. Our
targets have minimal soft X-ray absorption and are the brightest objects in their
class in the EUV. Hence they provide the best opportunity for determining the
intrinsic XUV spectra in individual objects.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:57:20.10  -22:22:55.60  TON S 180             ACIS-S LETG  80.00

===================================================================================

Proposal Number: 01700358            
Proposal Title: PROBING RELATIVISTIC OUTFLOWS IN EXTREME NLS1

PI: KIRPAL NANDRA                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The most extreme objects in the class of ``Narrow-Line'' Seyfert 1
galaxies (NLS1) show absorption features which are probably due to oxygen in a
relativistic wind outflowing from the nucleus. The features are blueshifted to
1-1.5 keV and therefore occur close to the peak efficiency of the MEG. We propose
to use that instrument to confirm the features and measure their energy, strength
and profiles to probe this unusual relativistic flow, which may represent an
analogue of the BAL phenomenon observed in the UV.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:06:21.80  +22:23:46.00  PG 1404+226           ACIS-S HETG  80.00

===================================================================================

Proposal Number: 01700369            
Proposal Title: LIFTING THE SHROUD AROUND BROAD ABSORPTION LINE QSOS: AN AXAF
SURVEY

PI: PAUL GREEN                     
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose a short-exposure AXAF survey of a sample of 16 bright Broad
Absorption Line (BAL) QSOs. BALs are caused by outflows from the nucleus with
velocities reaching 0.2c. Recent ROSAT studies imply that the soft X-ray
continuum of BALQSOs is either a) strongly absorbed by highly ionized material,
or b) intrinsically underluminous. Since about 10% of QSOs show BALs, the former
interpretation supports the hypothesis that most or possibly all QSOs contain
BAL-type outflows, with a 10% covering factor. BALQSOs may thus provide a unique
probe of cloud conditions near the nucleus of most QSOs. The latter alternative
means that BALQSOs are an intrinsically different type of quasar. We propose to
settle this question finally, with a judicious application of AXAF's unique
capabilities.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 01:02:17.10  -27:19:49.90  Q0059-2735            ACIS-S NONE   4.80
 01:37:12.90  -39:46:07.21  Q0135-4001            ACIS-S NONE   5.20
 02:56:47.85  -33:15:24.48  Q0254-334             ACIS-S NONE   1.00
 02:56:47.85  -33:15:24.48  Q0254-334             ACIS-S NONE   2.40
 08:04:30.40  +64:59:51.70  IRAS 07598+6508       ACIS-S NONE   1.00
 08:40:44.40  +36:33:27.20  FIRST J0840+3633      ACIS-S NONE   5.00
 08:45:38.66  +34:20:43.80  Q0842+3431            ACIS-S NONE   4.80
 11:23:20.60  +01:37:47.20  UM 425                ACIS-S NONE   2.40
 12:38:20.10  +17:50:38.70  LBQS 1235+1807B       ACIS-S NONE   2.00
 12:49:13.80  -05:59:19.20  Q1246-0542            ACIS-S NONE   6.50
 15:43:59.30  +53:59:03.60  SBSG 1542+541         ACIS-S NONE   2.50

===================================================================================

Proposal Number: 01700376            
Proposal Title: AN X-RAY MICROLENSING TEST OF THE AU-SCALE CENTRAL STRUCTURE OF
THE QUADRUPLE QUASAR 2237+0305 (EINSTEIN CROSS)

PI: SHIN MINESHIGE                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose AXAF observation of the gravitationally lensed quasar
Q2237+0305 (Einstein Cross) during a microlensing event. We will monitor the four
images of the QSO from the ground regularly to ascertain the onset of a
microlensing event. As the microlensing event occurs, we will measure the
variations of X-ray intensity and spectra with AXAF and compare with those taken
after the event. Since only a small region of the QSO accretion disk is strongly
magnified during a microlensing event, we will be able to limit the size of X-ray
emitting regions of the QSO and thus the mass which is contained on scales of
several AUs. If observed simultaneously with ground-based telescopes and with
HST, furthermore, we will also be able to probe multi-wavelength emission
properties of QSOs.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 22:40:30.30  +03:21:31.00  QSO 2237+0305         ACIS-S NONE  15.00
 22:40:30.30  +03:21:31.00  QSO 2237+0305         ACIS-S NONE  15.00
 22:40:30.30  +03:21:31.00  QSO 2237+0305         ACIS-S NONE  15.00
 22:40:30.30  +03:21:31.00  QSO 2237+0305         ACIS-S NONE  15.00

===================================================================================

Proposal Number: 01700398            
Proposal Title: THE X-RAY COMPLEX STRUCTURE OF THE POWERFUL RADIOGALAXY 3C 219

PI: GIANFRANCO BRUNETTI            
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: A ROSAT HRI observation of the powerful nearby (z=0.1744) FR II
radiogalaxy 3C 219 has revealed the presence of complex extended soft X-ray
emission which appears to be aligned with the radio axis. It has been proposed
that extended soft X-ray emission may originate by inverse Compton scattering of
the nuclear radiation field by the relativistic electrons in the radio lobes. We
propose an ACIS-S-BI observation of 3C 219 to study the spatial and spectral
properties of the extended emission. AXAF offers the unique opportunity to
disentangle the nuclear and the extended component with arcsecond resolution to
obtain spatially resolved X-ray spectroscopy. Such an observation will allow to
test the origin of the X-ray emission in this radiogalaxy.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:21:08.60  +45:38:58.00  3C 219                ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01700411            
Proposal Title: X-RAY EMISSION FROM THE OPTICAL JET OF THE RADIO GALAXY 3C 66B:
TESTING THEORIES OF PARTICLE ACCELERATION

PI: MARTIN HARDCASTLE              
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: Synchrotron radiation at optical and X-ray wavebands provides important
constraints on the location and nature of particle and acceleration processes in
jets; X-ray jets are particularly important because of the very short synchrotron
lifetimes of X-ray emitting electrons. Only two such jets are known, in the
nearby (and atypical) sources M87 and Cen A. Here we propose observations which
we expect to detect an X-ray jet in the archetypal twin-jet radio galaxy 3C 66B,
known to have an optical jet. AXAF's spatial resolution is critical for this
project; using it, we will be able to locate the sites of X-ray emission and thus
strongly constrain or reject models in which particles are accelerated at the
knots in the jet, thought to correspond to internal shocks.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:23:11.50  +42:59:31.40  3C 66B                ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01700412            
Proposal Title: THE MAGNETIC FIELD STRENGTH IN THE RADIO HOT SPOT OF 3C 123:
SYNCHROTRON SELF-COMPTON EMISSION AND EQUIPARTITION

PI: MARTIN HARDCASTLE              
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: Observations of synchrotron-self-Compton (SSC) emission from the hot
spots of powerful extragalactic radio sources are vital for a measurement of the
magnetic field strength in these components; without this the dynamics and
energetics of these sources are very poorly constrained. With previous X-ray
observatories only one such measurement has been made (in the powerful radio
source Cygnus A). We now propose observations of the radio galaxy 3C 123 which
will detect SSC emission from the hot spot and enable an accurate measurement of
the magnetic field strength. 3C 123 is the most suitable object in the sky, after
Cygnus A, for such a study. A by-product of our observations will be data on the
X-ray core and environment of 3C123 which will shed new light on its peculiar
radio structure.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:37:04.37  +29:40:13.80  3C 123                ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01700423            
Proposal Title: AN X-RAY SIGNATURE OF THE RADIO JET OF 3C 390.3

PI: Kai Otterbein                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The radiation mechanism of collimated plasma outflows (jets) from
active galactic nuclei are still far from beeing understood. Especially the X-ray
emission reported from jets raises questions on the nature of the acceleration
mechanism and the radiation process at work. Recently, X-ray emission from the
jet/hotspot region of 3C 390.3 was reported. This is for the first time an X-ray
source which is close to the hotspot of a jet. We propose to observe the
hotspot/jet source with AXAF for 35 ksec in order to obtain the X-ray spectrum
and to map the extended structure indicated by the ROSAT HRI. We would like to
identify the source and distinguish several possible scenarios of its nature.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:41:48.00  +79:47:43.00  JET OF 3C 390.3       ACIS-S NONE  35.00

===================================================================================

Proposal Number: 01700454            
Proposal Title: EMISSION-LINE SPECTROSCOPY OF NGC 3516

PI: HAGAI NETZER                   
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose 50-ks LETG/ACIS-S observations of the Seyfert Galaxy NGC
3516. The source is one of the brightest of its kind, contains a strong ``Warm
Absorber'', and the galactic column is relatively small. We will also obtain
guaranteed HST-STIS observations. The AXAF observations will allow us to measure
between 4 and 9 emission lines (depending on their width), several absorption and
emission edges, and X-ray absorption lines if present in the spectrum. We will
determine the level of ionization and perhaps the metallicity. We will also
measure line and edge widths and, if the X-ray lines are less than 4000 km/sec
wide, the gas motion. This will give the best ever obtained indication of the WA
location and will allow us to estimate the mass of the emitting material.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:06:47.49  +72:34:06.88  NGC 3516              ACIS-S LETG  50.00

===================================================================================

Proposal Number: 01700484            
Proposal Title: RECONCILING UV AND X-RAY OBSERVATIONS OF BALQSO WINDS

PI: FREDERICK HAMANN               
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: Recent X-ray observations of BALQSOs indicate absorbing columns that
are 2 or more orders of magnitude larger than previous estimates from the UV
absorption lines. This huge discrepancy must be resolved if we are to understand
even the most basic properties of BAL winds (eg. their mass, location,
acceleration, ionization, etc.). I recently used high-quality HST spectra of the
bright (V = 15.8), low redshift (z_abs = 0.87) BALQSO PG 1254+047 to derive much
larger column densities from the BALs, invoking new evidence that the lines are
more optically thick than they appear. I now propose AXAF/ACIS-S observations to
1) test my BAL analysis and 2) place unprecedented constraints on the wind
parameters and on the relationship between the UV and X-ray absorbers.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:57:00.10  +04:27:34.20  PG 1254+047           ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01700486            
Proposal Title: THE ULTRA-HIGH VELOCITY (-56,000 KM/S) ABSORBER IN THE QSO
PG2302+029

PI: FREDERICK HAMANN               
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We will combine new AXAF/ACIS-S-BI spectra with existing and
forthcoming HST UV spectra to study the extreme high-velocity absorber (detached
by ~56,000 km/s from the emission redshift) in the bright (V = 16.0) QSO, PG
2302+029. The UV line profiles have moderate widths (FWHM ~ 4000 km/s) but the
outflow velocities are higher than in any previously measured system. Our
combined X-ray and UV observations should 1) determine for the first time if
there is OUTFLOWING X-ray absorption in QSOs, 2) improve our understanding of QSO
metal abundances, and 3) yield the best information to date on the physical
conditions, the acceleration mechanism(s), and the relationship between UV and
X-ray absorption in QSO outflows.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 23:04:44.90  +03:11:45.80  PG 2302+029           ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01700490            
Proposal Title: SOLVING THE PROBLEM OF THE CORE STRUCTURES AND SPECTRA OF NEARBY
RADIO GALAXIES NGC 6251 AND NGC 4261

PI: MARK BIRKINSHAW                
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: ROSAT PSPC and HRI observations of the low-power radio galaxies
NGC~6251 (z=0.0234) and NGC~4261 (z=0.0089) have shown complicated X-ray
structures and spectra. In both objects we find an extended atmosphere and a
small-scale bright component associated with the active nucleus. However, the
interpretation of this nuclear X-ray emission is complicated by the presence of
multiple spectral components, and has remained ambiguous in the absence of X-ray
data with good spatial and spectral resolution. Here we propose ACIS observations
of these galaxies to determine the fraction of their core X-radiation which
originates in non-thermal processes, and to study the gas components of the cores
and envelopes. X-ray emission from the jets will also be detectable.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:19:23.20  +05:49:29.60  NGC 4261              ACIS-S NONE  35.00

===================================================================================

Proposal Number: 01700493            
Proposal Title: UNDERSTANDING THE AGN/STARBURST CONNECTION AT HIGH LUMINOSITIES

PI: MARTIN WARD                    
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The overall aim of this proposal is to understand the nature of
ultraluminous IRAS galaxies (ULIRGs) with double nuclei. The presence of two
nuclei, one of which is already known to be an AGN, seems to be a common property
of ULIRGs. Existing ASCA spectra reveal both hard and soft components, however
the spatial resolution of AXAF is essential if we are to determine the relative
X-ray fractions emitted by each nucleus. The spectral information will be used to
determine the origin of the hard and soft components ie. whether they are AGN or
starburst related. For the first time we shall unambiguously separate the AGN and
starburst X-ray activity in these systems of high bolometric luminosity.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:27:51.80  -43:54:08.70  NGC 3256              ACIS-S NONE  25.00
 13:47:33.40  +12:17:24.20  PKS B1345+125         ACIS-S NONE  25.00

===================================================================================

Proposal Number: 01700543            
Proposal Title: TIME RESOLVED SPECTROSCOPY, HIGH SENSITIVITY POWER SPECTRUM \& A
SEARCH FOR THE X-RAY QPO IN NGC 5548

PI: TAHIR YAQOOB                   
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: Controversy surrounds the EXOSAT discovery of a QPO (period ~500 s) in
NGC 5548 due to the data being plagued by high background and instrumental
systematics. If the NGC 5548 QPO is real, the implications for the physics of the
X-ray emission mechanism and inner-most disk/black-hole system are enormous. AXAF
provides the first opportunity to settle the issue, capable of yielding power
spectra with unprecedented sensitivity, pushing the limit on finding new
features. Using HETG/ACIS we will also perform time-resolved spectroscopy of the
ionized absorption features and Fe-K emission line, search for energy-dependent
time lags in the continuum, between the continuum and spectral features, and
between the spectral features. These data will provide powerful constraints on
models of AGN.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:17:59.50  +25:08:12.00  NGC 5548              ACIS-S HETG  80.00

===================================================================================

Proposal Number: 01700549            
Proposal Title: EXTENDED AND COMPACT X-RAY EMISSION IN DISTANT RADIO GALAXIES

PI: DIANA WORRALL                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose ACIS imaging and spectroscopy of four powerful radio
galaxies at $z > 0.4$ to separate their cluster and AGN components and address
their unification with quasars. The observations will test our tentative result,
based on ROSAT data, that the relationship between Doppler-boosted radio and
X-ray emission in flat-spectrum radio quasars extends to powerful radio galaxies.
The ACIS data will make the first measurements of the gas temperatures for
distant clusters selected as hosts of powerful radio sources (and so provide
information on the cosmological evolution of active-galaxy environments) and test
the idea that the presence of cooling gas is required to trigger the most
powerful radio sources.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:27:25.40  +29:18:46.50  3C 200                ACIS-S NONE  15.00
 09:32:39.60  +79:06:31.50  3C 220.1              ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01700568            
Proposal Title: THE X-RAY CLUSTER ENVIRONMENT OF BLAZARS

PI: Joseph Pesce                   
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: Blazars are an important class of AGN, offering a view of the energy
producing region near the central black hole. They are often found in poor galaxy
clusters, but intrinsic cluster properties are largely unknown. The environment
may play a role in determining the different blazar types and can tell us more
about the parent population. We propose to observe the environments of blazars
with the AXAF ACIS-I imager. Our complete sample of 12 objects, unbiased with
respect to the optical environment, spans all spectral energy distributions and
luminosities. We will detect cluster gas to below the expected luminosity for
poor clusters, and constrain its extent, temperature, mass, and density.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:50:40.80  -32:16:17.80  PKS 0548-322          ACIS-I NONE   4.60
 18:06:50.60  +69:49:28.10  3C 371                ACIS-S NONE  10.00
 20:09:25.40  -48:49:54.00  PKS 2005-489          ACIS-I NONE   6.00
 22:02:43.30  +42:16:39.80  BL LACERTAE           ACIS-I NONE   0.89
 22:02:43.30  +42:16:39.80  BL LACERTAE           ACIS-I NONE   2.10
 23:23:52.10  +42:10:59.00  1ES 2321+419          ACIS-I NONE   5.00
 23:47:04.80  +51:42:17.40  1ES 2344+514          ACIS-I NONE   3.00

===================================================================================

Proposal Number: 01700598            
Proposal Title: STRUCTURES AND SPECTRA OF HOT GAS AROUND NEARBY BL LAC OBJECTS

PI: MARK BIRKINSHAW                
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: If FR~I radio galaxies and BL~Lac objects are parts of a single
population, and only their orientation causes them to appear different (the
BL~Lac ``unification'' scheme), then they should have the same isotropic
properties. We recently extended existing radio and optical tests to the X-ray by
searching near BL~Lacs for X-ray emission which matches the X-ray envelopes of
FR~I objects found by Worrall \& Birkinshaw (1994). The well-known object
PKS~0521-365 shows an unexpectedly strong halo when observed with the ROSAT HRI.
Here we propose to use ACIS-I to obtain images and spectroscopy for PKS~0521-365
and three other BL Lacs. The data will determine the physical relationship
between halos and their AGN and test the unification scheme.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:22:57.98  -36:27:30.85  PKS 0521-365          ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01700599            
Proposal Title: THE X-RAY JET AND HALO OF NGC 6251

PI: JUERGEN KERP                   
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: This proposal is concerned with an AXAF ACIS-I X-ray observation of one
of the most prominent giant radio galaxies, NGC6251. Using ROSAT PSPC data we
could recently verify that this galaxy hosts a huge X-ray halo and an X-ray jet,
the latter with a very close correlation to the radio jet out to a radial
distance of 180 kpc. The high sensitivity and the excellent spectral resolution
of the AXAF ACIS-I telescope detector system will provide us with the data to
discern - beyond any doubts - the origin of the X-ray emission from the 180 kpc
X-ray jet. The huge dimensions of NGC6251 offer the unique opportunity to study,
in great detail, its characteristics which can be regarded as an archetypical
scenario of radio jets associated with X-ray emission.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:32:31.80  +82:32:28.00  NGC 6251              ACIS-I NONE  40.00

===================================================================================

Proposal Number: 01700615            
Proposal Title: DO BL LAC OBJECTS WEAR X-RAY HALOS?

PI: SALLY LAURENT-MUEHLEISEN       
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose to measure the fraction of X-ray flux in resolved vs.
unresolved components for three representative BL Lacs: an LBL, an HBL and an
intermediate object. These measurements will be used to test the assumptions of
the two leading unified scheme models. If LBLs and HBLs differ by orientation,
then the relativistic jets must be accelerating and the X-ray Doppler factors
will be smaller than the radio Doppler factors for a given object. If the
SED-based unified scheme is instead correct, then the X-ray and radio Doppler
factors for a given object should be the same. In addition, we will obtain direct
measurements of the diffuse X-ray luminosity which we will compare with exisiting
measurements for FRI radio galaxies and evaluate the assumptions of the BL
Lac/FRI unified scheme.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:31:18.50  +50:53:35.80  1031+508              HRC-I  NONE   5.00
 12:17:52.10  +30:07:00.60  1217+301              HRC-I  NONE  10.00

===================================================================================

Proposal Number: 01700624            
Proposal Title: X-RAYS FROM RADIO-LOUD BROAD ABSORPTION LINE QSOS

PI: MICHAEL BROTHERTON             
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose AXAF ACIS-I observations of several newly discovered
radio-loud Broad Absorption Line QSOs (BAL QSOs). Previous ROSAT observations of
radio-quiet BAL QSOs, which were the only kind known until recently, show that
they are X-ray quiet compared to normal radio-quiet QSOs. This surprising result
implies BAL QSOs are either (1) intrinsically X-ray-quiet, or (2) absorbed by
high column density material (N_H ~ 10^23 cm^-2). ASCA Observations of PHL 5200
suggest the latter. Because Radio-loud QSOs are more X-ray bright than
radio-quiet QSOs, AXAF is able to obtain spectra of our radio-loud BAL QSOs in
modest exposure times and verify that they are normal but absorbed radio-loud
QSOs. These data will help us to understand the relationship between QSO
absorption and radio properties.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:56:25.60  -01:19:11.90  BAL 0256-0119         ACIS-S NONE   5.00
 10:44:59.60  +36:56:05.00  BAL 1044+3656         ACIS-S NONE   5.00
 13:12:13.50  +23:19:58.00  BAL 1312+2319         ACIS-S NONE   5.00
 15:56:33.80  +35:17:58.00  BAL 1556+3517         ACIS-S NONE   5.00
 23:59:53.60  -12:41:49.00  BAL 2359-1241         ACIS-S NONE   5.00

===================================================================================

Proposal Number: 01700639            
Proposal Title: HUNTING THE AGN CORES IN FR1 RADIO GALAXIES

PI: DIANA WORRALL                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose ACIS imaging and spectroscopy to separate the
physically-distinct emission components that are confused in ROSAT HRI and PSPC
images and spectra of the cores of B2 radio galaxies. We will use the ACIS high
spatial resolution to resolve the cooling flows that we believe are present in
some cases (and which may be a vital component of the jet-formation process) and
separate them from the non-thermal AGNs. The ACIS spectral resolution will be
used to measure the temperature of the gas and the spectra of the small-scale
AGNs. The data obtained will further our study of the relationships between B2
radio galaxies and BL Lac objects and test the possibility that X-ray elongations
seen in some ROSAT HRI images are related to the radio structures.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:57:48.90  +30:21:08.70  B2 0055+30            ACIS-S NONE   5.00
 02:09:38.60  +35:47:50.60  B2 0206+35            ACIS-S NONE   8.00
 03:34:18.50  +39:21:23.70  B2 0331+39            ACIS-S NONE   5.00
 07:58:28.20  +37:47:12.00  B2 0755+37            ACIS-S NONE   8.00

===================================================================================

Proposal Number: 01700640            
Proposal Title: AXAF GRATING SPECTROSCOPY OF THE BRIGHT AND COMPLEX SEYFERT 1
GALAXY NGC 4051

PI: WILLIAM BRANDT                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose to make the first grating-resolution X-ray spectrum of NGC
4051 with the AXAF LETG. This bright Seyfert 1 has a low Galactic column and a
complex X-ray spectrum. Oxygen edges are seen from a `warm absorber' and
additional poorly-understood spectral features are also seen. We will resolve and
model the spectral complexity to determine its nature. We expect O, Ne, C and
other X-ray lines from the warm absorber, and we will use line energies/widths to
constrain the bulk velocity/velocity dispersion of the warm absorber. X-ray line
strengths will constrain the warm absorber covering factor, and we will
critically examine if the warm absorber is in photoionization equilibrium. We
will also obtain HST STIS spectra to study UV absorption and test the UV/X-ray
absorber model.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:03:09.60  +44:31:52.80  NGC 4051              ACIS-S HETG  80.00

===================================================================================

Proposal Number: 01700650            
Proposal Title: SPECTROSCOPY OF THE IONIZED GAS IN NGC 3227

PI: IAN GEORGE                     
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The nearby Sb galaxy, NGC 3227, is an interesting source in many
wavebands, and could represent a transitional Seyfert galaxy. Recent X-ray
observations show the source to exhibit extreme spectral variability on a
timescale of years. Most significantly the X-ray spectrum appears to change from
a Seyfert 1-like to a more Seyfert 2-like form. Here we propose a 50ks
ACIS-S/HETG observation of NGC 3227 in order to perform an exploratory
spectroscopic study. The proposed observations will provide our first insights as
to how and why the ionized, circumnuclear material in NGC 3227 might differ from
that seen in other objects.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:23:31.00  +19:51:54.00  NGC 3227              ACIS-S HETG  50.00

===================================================================================

Proposal Number: 01700656            
Proposal Title: WIDE SEPARATION QUASARS: PAIRS OR LENSES?

PI: PAUL GREEN                     
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose to image the wide (7'') separation quasar pair Q2345+007 to
determine whether it is a binary quasar or a gravitational lens and to probe the
nature of the lensing matter. With nearly identical optical spectra and identical
redshifts, this quasar pair remains the most intriguing example of an observed
configuration requiring the presence of massive, concentrated dark matter acting
as a gravitational lens. If the quasar pair Q2345+007 proves consistent with a
lens in X-rays, we expect to constrain, detect, or characterize the most
compelling ``dark cluster'' candidate known. If not, our observation will lend
credence to the binary interpretation, showing Q2345+007 to be a bizarre case of
virtually identical spectral energy distributions in quasars separated by about
3Mpc.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 23:48:19.60  +00:57:21.10  Q2345+007             ACIS-S NONE  80.00

===================================================================================

Proposal Number: 01700702            
Proposal Title: HETG OBSERVATIONS OF EXTREME NARROW-LINE SEYFERT 1 GALAXIES

PI: KAREN LEIGHLY                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We have recently discovered absorption features near 1 keV in the ASCA
spectra of three Narrow-line Seyfert 1 galaxies (NLS1s). Plausible explanations
for this feature are oxygen continuum or resonance line absorption by
relativistically outflowing gas, but absorption by material overabundant in iron
cannot be ruled out. We propose 100 ks HETG observations of the brighter two of
these objects, 1H 0707-495 and IRAS 13224-3809, to determine the origin of this
feature. These objects also show the steepest spectra and highest amplitude
variability of the NLS1s observed by ASCA, and therefore identification of this
feature could be an important clue for understanding these enigmatic objects.
Analysis and interpretation will be enhanced by our upcoming HST STIS
observations of these

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 07:08:41.50  -49:33:05.80  1H 0707-495           ACIS-S HETG  35.00
 07:08:41.50  -49:33:05.80  1H 0707-495           ACIS-S HETG  65.00

===================================================================================

Proposal Number: 01700703            
Proposal Title: HETG OBSERVATION OF AN UNUSUAL SPECTRAL FEATURE IN THE
NARROW-LINE SEYFERT 1 GALAXY ARK 564

PI: KAREN LEIGHLY                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose a 50 ks HETG observation to identify an unusual emission
feature near 1 keV found in the ASCA and SAX spectra of the bright narrow-line
Seyfert 1 galaxy Ark 564. This could be the first clear evidence of the predicted
soft X-ray line emission from an ionized accretion disk, which would support the
idea that NLS1s are characterized by a high accretion rate. Alternatively, we may
discover that this feature originates in emission from a warm absorber with
unusual ionization conditions, thereby permitting our study of a broader range of
warm absorber behavior. Ark 564 is bright enough that we will also be able to
study its X-ray variability and search for the nonlinearity which may be a
signature of NLS1s.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 22:42:39.30  +29:43:31.00  ARK 564               ACIS-S HETG  50.00

===================================================================================

Proposal Number: 01700726            
Proposal Title: X-RAY OBSERVATIONS OF THE MEGAMASER SEYFERT 2 GALAXY NGC 4945

PI: GRZEGORZ MADEJSKI              
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose a 50 ks ACIS-I observation of the megamaser Seyfert 2 galaxy
NGC 4945, in order to understand the nature and physical conditions of the
putative scattering medium, postulated to exist along the axis of the system;
with the measured mass of the black hole via megamaser observations, a detailed
study of this object is particularly fruitful. This observation will also allow
an investigation of the starburst/superwind activity known to exist in the
circumnuclear region.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:05:27.50  -49:28:03.00  NGC 4945              ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01700742            
Proposal Title: X-RAY ABSORPTION IN MODERATE REDSHIFT DAMPED LYMAN ALPHA
GALAXIES

PI: JILL BECHTOLD                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose to measure the X-ray absorbing column associated with
moderate redshift, intervening damped Lyman alpha and 21-cm quasar absorption
line systems. The advantage of the X-ray absorption is that it gives a measure of
the metal column density (mainly oxygen) and hence abundance, which is
independent of ionization, inclusion of the atoms in a molecule, or depletion
onto dust grains. We estimate that we will detect absorption if the gas is 1/8
solar or greater for one system at z=0.3 and 1/4 solar or greater for another at
z=0.4. For two other objects, we request short exposures with ACIS-S to measure
the spectral energy distribution in order to access the feasibility of future
grating observations.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:57:09.80  +14:46:11.70  Q0054+144             ACIS-S NONE   5.00
 11:30:07.10  -14:49:27.00  Q1127-145             ACIS-S NONE  30.00
 13:33:35.90  +16:49:03.40  Q1331+170             ACIS-S NONE   3.00

===================================================================================

Proposal Number: 01700746            
Proposal Title: IMAGING OF 2 NARROW LINE TYPE 1 AGN

PI: FABRIZIO FIORE                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: This proposal is to observe with AXAF ACIS-I two narrow line type 1 AGN
which showed in previous ROSAT PSPC and BeppoSAX MECS observations evidence of
extended emission, or of a high density of surrounding point sources, on scales
of a few arcmin. These observations can help in assessing the origin of the
emission observed between 0.1 and 10 keV around these AGN and in understanding
whether there is a connection between these peculiar active nuclei and their
environment.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:18:30.30  +40:25:54.00  PG 1115+407           ACIS-I NONE  20.00

===================================================================================

Proposal Number: 01700748            
Proposal Title: AXAF INVESTIGATION OF THE ARCHETYPAL ULIRG: ARP 220

PI: DAVID CLEMENTS                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose to observe Arp 220, the prototypical ULIRG, with AXAF with
three complementary goals: (1) To detect or set strong limits on the hard X-ray
emission from any dust-obscured AGN. This will finally settle the issue of the
importance of an AGN in Arp 220 and other ULIRGs. (2) To examine the role of the
hot interstellar medium in galaxy mergers. Of special importance is matching high
resolutiuon AXAF images to HST and ground-based data to determine the role of
dust, proto-globulars, and other features in the X-ray emission. (3) To determine
the physical state of the extended superwind and look for any interaction with
the Intergalactic Medium. We aim to understand the interaction between Arp 220
and its environment and thus the origin and fate of this highly luminous recent
merger.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:34:57.10  +23:30:12.00  ARP 220               ACIS-S NONE  60.00

===================================================================================

Proposal Number: 01700766            
Proposal Title: X-RAY OBSERVATION OF THE NEAREST LINERS AND SEYFERT GALAXIES

PI: PAULINA LIRA                   
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: It is not clear whether the large numbers of very low-luminosity
LINER-like galactic nuclei are really AGN or not. We propose AXAF observations of
the nearest known such objects, most of which have known weak nuclear soft X-ray
sources, aimed primarily at (a) testing whether the X-ray sources are compact or
extended, and (b) looking for much stronger but absorbed hard X-ray sources. If
instead the "activity" is due to some sort of starburst, choosing the very
nearest examples should give us the best chance of resolving this activity - even
for the most distant objects in our sample, 1kpc is 30 arcsec. We should be able
to detect individual X-ray binaries and supernova remnants to approximately 10e37
erg/s.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 01:09:26.90  +35:43:03.40  NGC 404               ACIS-S NONE  25.00
 11:28:01.30  +78:59:34.60  UGC 6456              ACIS-S NONE  10.00
 17:49:27.50  +70:08:41.10  NGC 6503              ACIS-S NONE  15.00

===================================================================================

Proposal Number: 01700862            
Proposal Title: THE SOFT X-RAY EMISSION LINE SPECTRUM OF MARKARIAN 3

PI: STEVEN KAHN                    
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: X-ray spectra of Seyfert II galaxies exhibit discrete spectral features
in the soft X-ray band. The line formation mechanisms are not well understood and
detailed spectroscopy will provide a wealth of information about the structure of
the circumnuclear regions. Mkn 3 is one of the brightest Seyfert II galaxies in
soft X-rays and we propose an AXAF observation with the HETGS to obtain high
resolution X-ray spectra of the emission-line regions in Mkn 3. Our primary goal
is to determine the underlying line emission mechanisms and to constrain the
ionization structure of the active nucleus.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 06:15:36.00  +71:02:04.50  MARKARIAN 3           ACIS-S HETG 100.00

===================================================================================

Proposal Number: 01700863            
Proposal Title: A STUDY OF THE EXTENDED EMISSION AROUND BRIGHT BLAZAR AGN'S

PI: PAOLO COPPI                    
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose observations of two high redshift (z=0.8,z=1.8), powerful
blazar AGN. The AGN are strong EGRET sources, with hard spectra extending to at
least 10 GeV. If their emission extends significantly past 20 GeV, these AGN will
be surrounded by X-ray halos produced by cascading of >20 GeV energy photons on
diffuse IR/O background radiation. The halo structure depends on the local (high
redshift) IR/O background and the intergalactic magnetic field. We will be able
to map out the X-ray structure of these AGNs' radio jets (one of which shows
bending) on scales directly comparable to VLA ones. We can also follow rapid
variations in the blazar spectra, including (in one case) those at optical
wavelengths. These blazars are likely in rich clusters, and we might detect
cluster gas.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:59:31.80  +29:14:43.80  1156+295              ACIS-I NONE  75.00

===================================================================================

Proposal Number: 01700871            
Proposal Title: SURVEY OF RADIO QUIET $Z>4$ QUASARS

PI: JILL BECHTOLD                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose to measure the X-ray flux of 27 previously undetected,
bright, radio quiet quasars with $z>4$. To date, only 6 radio quiet quasars with
$z>4$ have been detected in X-rays. We draw our sample from the objects whose
emission line spectra have been observed by Shields and Hamman with Keck and the
MMT. These well-studied objects form the definitive sample of the highest
redshift quasars known.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:44:01.90  -01:34:03.00  BRI 0241-0146         ACIS-S NONE   3.60
 02:48:54.30  +18:02:50.00  PSS 0248+1802         ACIS-S NONE   2.10
 10:36:23.70  -03:43:20.00  BRI 1033-0327         ACIS-S NONE   3.90
 10:57:56.40  +45:55:52.00  PSS 1057+4555         ACIS-S NONE   3.30
 13:17:43.20  +35:31:31.00  PSS 1317+3531         ACIS-S NONE   2.50
 14:35:23.50  +30:57:23.00  PSS 1435+3057         ACIS-S NONE   2.50
 14:43:31.20  +27:24:37.00  PSS 1443+2724         ACIS-S NONE   2.10

===================================================================================

Proposal Number: 01700918            
Proposal Title: TESTING THE AGN PRARDIGM IN THE MICRO-QUASAR NGC 4395

PI: Alexei Filippenko              
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The nearby dwarf spiral galaxy NGC 4395 harbors the least luminous
Seyfert 1 nucleus known. In the soft X-ray band, NGC 4395 is quite remarkable. It
is rapidly variable, and its spectrum is exceedingly flat for an AGN, exhibiting
an unusually strong absorption feature due to intervening ionized gas. Deep AXAF
observations will allow us to investigate whether the flat spectrum of this
unique object extends to higher energies and if, like other AGNs, it possesses an
Fe K emission line. These results will help us to better understand the structure
and energetics of NGC 4395's nucleus, as well as insight into the nature of
active galaxies at the very bottom of the AGN luminosity function and their
contribution to the cosmic X-ray background.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:25:48.90  +33:32:48.40  NGC 4395              ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01700924            
Proposal Title: INVESTIGATING THE X-RAY PROPERTIES OF AN AGN-DRIVEN OUTFLOW IN
NGC 2110

PI: KIMBERLY WEAVER                
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose a 50 ks observation of the Seyfert 2 galaxy NGC 2110 with
the HRMA+ACIS-S BI combination to investigate the detailed X-ray properties of
the large-scale outflow powered by the AGN. We will study the X-ray properties of
extended emission on scales smaller than ~0.5 kpc (the size of the extended
emission as deduced from ROSAT HRI observations). X-ray studies of starburst
galaxies show that starburst-powered outflows are very common in starburst
galaxies (e.g., Dalhem et al. 1998), but little attention has been paid to the
large-scale properties of AGN-driven outflows. Are they similar to
starburst-driven `superwinds' or are they similar to AGN-driven jets? NGC 2110
has an AGN-powered outflow and we seek to determine the physical and X-ray
properties of the outflow.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:52:11.40  -07:27:22.00  NGC 2110              ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01700946            
Proposal Title: THE METAL ABUNDANCES IN LOW-REDSHIFT DAMPED LY-ALPHA GALAXIES

PI: DAVID TURNSHEK                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The aim of this proposed AXAF-ACIS program is to detect or constrain
the amount of low-redshift photoelectric absorption caused by metals in five
low-redshift QSO damped Ly-alpha systems. AXAF-ACIS-S (BI) can be used to derive
accurate determinations of metal-to-hydrogen ratios in the range 1.0 to 0.1 times
solar abundances for the low-redshift systems, providing they have sufficiently
high HI column densities. In the HI-disk paradigm for damped systems,
metallicities should approach approximately solar abundances. This can be tested.
More generally, this program will lead to important empirical results on the
chemical enrichment history of the gaseous components of damped Ly-alpha
galaxies.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:38:39.90  +16:36:59.30  0235+164              ACIS-S NONE  30.00
 02:51:34.50  +43:15:15.80  0248+430              ACIS-S NONE  30.00

===================================================================================

Proposal Number: 01700851            
Proposal Title: LETG SPECTROSCOPY OF THE MKN 478: THE BRIGHTEST NARROW-LINE
SEYFERT 1 IN THE SOFT X-RAY SKY

PI: RICK EDELSON                   
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: Narrow-line Seyfert 1s have strong, variable soft X-ray excesses and
unusually narrow optical emission lines. With a very strong excess and low
Galactic column, Mkn 478 is by far the brightest NLS1 at soft X-ray energies. We
propose a 75~ksec LETG observation that should yield a spectrum with >30,000
photons, making efficient use of precious AO1 time to study an archetype of this
type of AGN. The LETGS's excellent resolution and throughput will allow the first
detailed spectral studies of the excess, resolving any blended lines and showing
there is a strong soft thermal or nonthermal continuum. Also, the variability of
different components could provide key constraints on their sizes.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:42:07.40  +35:26:23.00  MKN 478               HRC-S  LETG  75.00

===================================================================================

Proposal Number: 01700800            
Proposal Title: THE HIDDEN UNIVERSE - AXAF OBSERVATIONS OF A DEEP INFRARED
SURVEY

PI: OMAR ALMAINI                   
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose 4 ACIS-I observations, each of 75ks, centred on sub-areas of
an extremely well studied region from the European Large Area ISO Survey (ELAIS).
With existing deep ISO observations in the mid-and far-infrared, VLA observations
at 20cm, SCUBA sub-millimetre data and accumulating CCD BVRI and near-IR
coverage, these fields are ideal for detecting and studying the properties of
dust obscured objects. If the hard X-ray background is indeed due to obscured
AGN, we will detect dozens of these objects with both ELAIS and AXAF This will
provide a clear cut test of this model, and enable us to study the properties of
these objects across most of the electromagnetic spectrum.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:10:21.90  +54:33:36.00  Elais:N1              ACIS-I NONE  75.00
 16:36:48.48  +41:01:45.90  Elais:N2              ACIS-I NONE  75.00

===================================================================================

Proposal Number: 01700006            
Proposal Title: A PRECISE MEASUREMENT OF THE POSITION OF THE SOURCE OF GIANT AND
RAPID VARIABILITY IN THE NLS1 13224-3809

PI: PETER PREDEHL                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: Within a 30 day ROSAT HRI monitoring observations we have detected the
strongest persistent X-ray variability known in a Seyfert galaxy. At least 5
giant amplitude variations with a factor of about 60 are visible. Unusually
strong relativistic boosting effects provide the most plausible explanation of
the X-ray data. We propose to use AXAF for a precise measurement of the position
of the source of the strong variability to further proof that the X-rays we
measure are associated with the distant galaxy. We expect about 500 HRC photons
within 10 ks observing time. We may further improve the HRG position using
serendipitous X-ray sources detected previously with the HRI that have
counterparts in the Optical.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:25:20.00  -38:24:55.00  IRAS 13224-3809       HRC-I  NONE  10.00

===================================================================================

Proposal Number: 01700008            
Proposal Title: OBSERVATIONS OF BRIGHT ACTIVE GALACTIC NUCLEI WITH LETGS

PI: ALBERT BRINKMAN                
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: 3 relatively bright AGNs are selected: 1 bright Seyfert 1 galaxy (NGC
5548) with strong soft X-ray excess and with indications for a warm absorber and
line (EUV) emission 1 Seyfert 2 galaxy (NGC 1068) of which the continuum is
blocked so that only reprocessed radiation is seen PKS 2155-304, the brightest BL
Lac object on the sky. A broad absorption feature is tentatively identified as
discrete absorption by O VIII Lyman alpha.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:42:40.90  -00:00:47.60  NGC 1068              ACIS-S LETG  80.00
 14:17:59.50  +25:08:13.00  NGC 5548              HRC-S  LETG  80.00
 21:58:51.70  -30:13:32.20  PKS 2155-304          HRC-S  LETG  26.70
 21:58:51.70  -30:13:32.20  PKS 2155-304          HRC-S  LETG  60.00

===================================================================================

Proposal Number: 01700027            
Proposal Title: HETG OBSERVATIONS OF VARIOUS ACTIVE GALACTIC NUCLEI

PI: CLAUDE CANIZARES               
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: Observe 1 BL Lac to see absorption from relativistic jets, 1 AGN to
resolve a possibly broad Fe-K line, 1 Sy 2 to detect and measure emission lines
from hot gas near the nucleus, 1 high z QSO to find Fe-K emission and possible
absorption, 1 high z QSO with damped Ly alpha absorption to see evidence for
X-ray absorption, 1 narrow line Sy 1 galaxy to determine the nature of spectral
features at 1 keV, 1 Sy 1 AGN to measure the emission and resolve absorption due
to warm absorption, and 1 AGN in a cluster of galaxies to find absorption due to
the hot cluster gas.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:42:40.70  -00:00:48.00  NGC 1068              ACIS-S HETG  50.00
 03:19:48.10  +41:30:42.00  NGC 1275              ACIS-S HETG  25.00
 03:19:48.10  +41:30:42.00  NGC 1275              ACIS-S HETG  50.00
 08:41:24.30  +70:53:42.00  Q0836+7104            ACIS-S HETG   0.18
 08:41:24.30  +70:53:42.00  Q0836+7104            ACIS-S HETG  14.00
 08:41:24.30  +70:53:42.00  Q0836+7104            ACIS-S HETG  61.00
 12:10:32.60  +39:24:21.00  NGC 4151              ACIS-S HETG  50.00
 21:51:55.50  -30:27:53.70  PKS 2149-306          ACIS-S HETG  30.00
 21:51:55.50  -30:27:53.70  PKS 2149-306          ACIS-S HETG  60.00
 21:58:52.00  -30:13:32.00  PKS 2155-304          ACIS-S HETG  26.70
 21:58:52.00  -30:13:32.00  PKS 2155-304          ACIS-S LETG  26.70
 21:58:52.00  -30:13:32.00  PKS 2155-304          ACIS-S HETG  40.00

===================================================================================

Proposal Number: 01700033            
Proposal Title: STUDIES OF RADIO JETS AND THE NARROW LINE REGIONS

PI: ANDREW WILSON                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The X-ray emission of radio jets and of the narrow line regions of
active galaxies will be investigated with AXAF. Images and spectra will be
obtained to define the morphologies, X-ray powers, emission mechanisms and
physical conditions of both unresolved nuclear and extended emission. Detection
of non-thermal X-rays (inverse Compton or synchrotron emission) will probe the
properties of the magnetic fields and cosmic ray spectra. If thermal X-ray
emission is detected, the density, temperature and chemical abundances of hot gas
can be derived and the relationship to other components (radio emission, narrow
line region) studied. Hot gas can be associated with hot radiatively driven
winds, shocks driven by mass outflow or cooling accretion flows.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:42:40.70  -00:00:47.60  NGC 1068              ACIS-I NONE  20.00
 12:10:32.60  +39:24:20.40  NGC 4151              ACIS-I NONE  10.00
 19:59:28.30  +40:44:02.00  CYGNUS A              ACIS-I NONE  40.00

===================================================================================

Proposal Number: 01700035            
Proposal Title: STUDIES OF RADIO JETS AND THE NARROW LINE REGIONS

PI: ANDREW WILSON                  
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The X-ray emission of radio jets and of the narrow line regions of
active galaxies will be investigated with AXAF. Images and spectra will be
obtained to define the morphologies, X-ray powers, emission mechanisms and
physical conditions of both unresolved nuclear and extended emission. Detection
of non-thermal X-rays (inverse Compton or synchrotron emission) will probe the
properties of the magnetic fields and cosmic ray spectra. If thermal X-ray
emission is detected, the density, temperature and chemical abundances of hot gas
can be derived and the relationship to other components (radio emission, narrow
line region) studied. Hot gas can be associated with hot radiatively driven
winds, shocks driven by mass outflow or cooling accretion flows.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 01:23:54.32  -35:03:56.20  NGC 526A              ACIS-S NONE   1.00
 01:23:54.32  -35:03:56.20  NGC 526A              ACIS-S NONE   5.00
 01:23:54.32  -35:03:56.20  NGC 526A              ACIS-S NONE   9.00
 02:42:40.70  -00:00:47.60  NGC 1068              ACIS-S NONE  50.00
 02:42:40.70  -00:00:47.60  NGC 1068              ACIS-S NONE   1.00
 02:42:40.70  -00:00:47.60  NGC 1068              ACIS-S NONE  20.00
 05:19:49.70  -45:46:45.00  PICTOR A              ACIS-S NONE   1.00
 05:19:49.70  -45:46:45.00  PICTOR A              ACIS-S NONE   5.00
 05:19:49.70  -45:46:45.00  PICTOR A              ACIS-S NONE  29.00
 12:10:32.60  +39:24:20.00  NGC 4151              ACIS-S NONE  10.00
 12:10:32.60  +39:24:20.00  NGC 4151              ACIS-S NONE  30.00
 12:10:32.60  +39:24:20.40  NGC 4151              ACIS-S NONE   1.00
 12:18:57.80  +47:18:12.00  NGC 4258              ACIS-S NONE   1.00
 12:18:57.80  +47:18:12.00  NGC 4258              ACIS-S NONE  14.50
 12:30:49.40  +12:23:27.90  M87                   ACIS-S NONE   1.00
 12:30:49.40  +12:23:28.00  M87                   ACIS-S NONE  14.00
 12:30:49.40  +12:23:28.00  M87                   ACIS-S NONE  40.00
 13:29:52.30  +47:11:54.00  M51                   ACIS-S NONE   1.00
 13:29:52.30  +47:11:54.00  M51                   ACIS-S NONE  15.00
 14:13:10.20  -65:20:21.00  CIRCINUS GALAXY       ACIS-S NONE   1.00
 14:13:10.20  -65:20:21.00  CIRCINUS GALAXY       ACIS-S NONE   5.00
 14:13:10.20  -65:20:21.00  CIRCINUS GALAXY       ACIS-S NONE  25.00
 14:13:14.80  -03:12:27.00  NGC 5506              ACIS-S NONE   1.00
 14:13:14.80  -03:12:27.00  NGC 5506              ACIS-S NONE   9.00
 19:59:28.30  +40:44:02.00  CYGNUS A              ACIS-S NONE   1.00
 19:59:28.30  +40:44:02.00  CYGNUS A              ACIS-S NONE  10.00
 19:59:28.30  +40:44:02.00  CYGNUS A              ACIS-S NONE  35.00

===================================================================================

Proposal Number: 01700041            
Proposal Title: ACIS IMAGING OF THE STARBURST GALAXY M82

PI: GORDON GARMIRE                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: M82 is the prototype starburst galaxy, the closest galaxy with
L(FIR)>L(V). Its inner kpc is experiencing a violent episode of star formation
with a top-heavy initial mass function following a recent passage by M81. The
result is a rich complex of OB stars, giant HII regions, supernovae and supernova
remnants all driving a hot galactic wind. This observation should detect and
resolve a considerable number of supernovae, young remnants, OB star clusters and
X-ray binaries in addition to the X-ray luminous hot interstellar medium.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:55:51.10  +69:40:45.00  M82                   ACIS-I NONE  34.00
 09:55:51.10  +69:40:45.00  M82                   ACIS-I NONE  16.00

===================================================================================

Proposal Number: 01700052            
Proposal Title: ACIS STUDY OF GRAVITATIONALLY LENSED QUASARS

PI: GORDON GARMIRE                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The ability to observe a distant quasar subject to gravitational
lensing by a foreground cluster of galaxies provides unique insight into dark
matter in clusters, cosmological parameters H_o and q_o, Ly-alpha absorption
systems, and more. ACIS imaging can simultaneous resolve the emission of the AGN
components and the intracluster medium of the lensing cluster, if present.
Repeated observations can measure time delays and ACIS grating spectroscopy can
measure differences in absorption along different lines of sight.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:01:21.33  +55:53:57.16  Q0957+561             ACIS-S NONE  50.00
 11:18:17.00  +07:45:57.70  PG 1115+080           ACIS-S NONE  30.00
 14:24:38.09  +22:56:00.60  Q1422+231             ACIS-S NONE  30.00
 18:33:39.94  -21:03:39.70  PKS 1830-211          ACIS-S HETG  50.00
 18:33:39.94  -21:03:39.70  PKS 1830-211          ACIS-S HETG  50.00

===================================================================================

Proposal Number: 01700053            
Proposal Title: ACIS GRATING SPECTROSCOPY OF SEYFERT GALAXIES

PI: GORDON GARMIRE                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The X-ray spectra of Seyfert galaxies can be very complex with
combinations of thermal emission from the accretion disk, Compton upscattering of
disk photons, Compton reflection continuum, nonthermal jet continuum, ultrasolf
component, neutral and ionized absorbers. This study concentrates on high
resolution spectroscopy of one bright Seyfert 1 (NGC 3783) and one bright Seyfert
2 (Circinus galaxy). NGC 3783 is a particularly good laboratory for study of the
ionized `warm absorbers' in AGNs; numerous absorption edges are expected which
will strongly constrain the geometry of material around the AGN. Circinus is
expected to show a rich emission line spectrum superposed on a reflection
continuum.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:39:01.70  -37:44:19.50  NGC 3783              ACIS-S HETG  55.00
 14:13:10.20  -65:20:20.60  CIRCINUS GALAXY       ACIS-S HETG   8.00
 14:13:10.20  -65:20:20.60  CIRCINUS GALAXY       ACIS-S HETG  67.00

===================================================================================

Proposal Number: 01700063            
Proposal Title: HIGH REDSHIFT QUASAR SPECTRA

PI: STEPHEN MURRAY                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We will obtain ACIS-S spectra of quasars at high redshifts to
investigate their: emission spectra to ~30keV (rest); Fe-K emission; low energy
cut-offs. A search for extended emission around the quasars will limit any hot
atmosphere associated with the surrounding galaxy/cluster in formation.
PKS2126-158 is the brightest of the absorbed high z quasars. HE1104-1805 is a
radio quiet quasar lensed to be bright. The lens contains a damped Lyman-alpha
absorber that should affect the X-ray spectrum, and the two lens components are
readily resolved by AXAF at 3 arcsec separation.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:06:33.50  -18:21:24.00  HE 1104-1805          ACIS-S NONE  49.00
 21:29:12.10  -15:38:42.00  PKS 2126-158          ACIS-S NONE  25.00

===================================================================================

Proposal Number: 01700064            
Proposal Title: EXTENDED EMISSION AROUND A GIGAHERTZ PEAKED RADIO SOURCE

PI: STEPHEN MURRAY                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: B2 0738+313 is a Gigahertz Peaked Spectrum (GPS) radio source. Our
ROSAT HRI observations show that the X-ray source is extended. This probably
indicates a group or cluster of galaxies with a hot ICM is present. Such a high
pressure environment may limit the expansion of the radio source and may cause
its low frequency absorption. An AXAF image will allow the determination of the
properties of this environment- scale size, temperature, pressure - separately
from the quasar emission.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 07:41:10.70  +31:12:00.40  B2 0738+313           ACIS-S NONE  29.00

===================================================================================

Proposal Number: 01700066            
Proposal Title: THE ORIGIN OF HARD X-RAYS FROM M82

PI: STEPHEN MURRAY                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose a series of onservations of M82 spread over 1 year to
investigsate the variability of sources in the nuclear region to a limiting
luminosity of 1E37 ergs/sec. This will allow us to determnine if the hard x-rays
ion M82 come from a low luminosity AGN and to investigate the properties of x-ray
binaries and luminous SNR in the galaxy. Co-adding the data will allow studies of
extended emission and a super-wind halo.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:55:47.00  +69:40:58.00  M82                   ACIS-I NONE   5.00
 09:55:47.00  +69:40:58.00  M82                   ACIS-I NONE   5.00
 09:55:47.00  +69:40:58.00  M82                   ACIS-I NONE   5.00

===================================================================================

Proposal Number: 01700068            
Proposal Title: LOW-LUMINOSITY ACTIVE GALACTIC NUCLEI IN NEARBY GALAXIES

PI: GORDON GARMIRE                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: The rapid cosmic evolution of the QSO population predicts that a
substantial fraction of massive galaxies today chould contain supermassive black
holes. A recent optical emission line survey finds that over 40% of all nearby
bright galaxies may harbor LLAGNs. These sources may contribute substantially to
the X-ray background radiation. This snapshot survey provides brief ACIS images
of the nuclei for a volume-limited sample of 25 candidate LLAGN plus several
prototype galaxies of different classes.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:47:33.10  -25:17:18.00  NGC 253               ACIS-S NONE   2.00
 01:09:26.90  +35:43:03.00  NGC 404               ACIS-S NONE   2.00
 02:41:04.80  -08:15:21.00  NGC 1052              ACIS-S NONE   2.00
 02:41:45.20  +00:26:30.00  NGC 1055              ACIS-S NONE   2.00
 02:43:29.90  +37:20:27.00  NGC 1058              ACIS-S NONE   2.00
 09:19:18.90  +69:12:10.50  NGC 2787              ACIS-S NONE   1.16
 09:22:02.70  +50:58:35.00  NGC 2841              ACIS-S NONE   2.00
 09:55:33.20  +69:03:55.00  NGC 3031              ACIS-S NONE   2.00
 10:46:45.80  +11:49:11.00  NGC 3368              ACIS-S NONE   2.00
 11:00:18.10  +13:54:08.00  NGC 3489              ACIS-S NONE   2.00
 11:00:23.90  +28:58:30.00  NGC 3486              ACIS-S NONE   2.00
 11:20:14.90  +12:59:21.00  NGC 3627              ACIS-S NONE   2.00
 11:20:16.20  +13:35:22.00  NGC 3628              ACIS-S NONE   2.00
 11:26:08.00  +43:34:58.00  NGC 3675              ACIS-S NONE   2.00
 12:15:05.00  +33:11:49.00  NGC 4203              ACIS-S NONE   2.00
 12:20:06.80  +29:16:50.00  NGC 4278              ACIS-S NONE   2.00
 12:22:31.90  +29:53:43.00  NGC 4314              ACIS-S NONE   2.00
 12:22:54.80  +15:49:20.00  NGC 4321              ACIS-S NONE   2.00
 12:25:04.00  +12:53:14.00  NGC 4374              ACIS-S NONE   2.00
 12:25:48.90  +33:32:48.00  NGC 4395              ACIS-S NONE   2.00
 12:31:24.30  +25:46:24.00  NGC 4494              ACIS-S NONE   2.00
 12:36:20.70  +25:59:16.00  NGC 4565              ACIS-S NONE   2.00
 12:36:50.00  +13:09:46.00  NGC 4569              ACIS-S NONE   2.00
 12:37:43.50  +11:49:05.00  NGC 4579              ACIS-S NONE   2.00
 12:39:58.80  -11:37:28.00  NGC 4594              ACIS-S NONE   2.00
 12:42:52.35  +13:15:26.40  NGC 4639              ACIS-S NONE   1.45
 12:50:26.60  +25:30:06.00  NGC 4725              ACIS-S NONE   2.00
 12:50:53.00  +41:07:12.00  NGC 4736              ACIS-S NONE   2.00
 12:56:44.20  +21:41:05.00  NGC 4826              ACIS-S NONE   2.00
 13:13:27.60  +36:35:39.70  NGC 5033              ACIS-S NONE   2.00
 13:15:49.30  +42:01:45.00  NGC 5055              ACIS-S NONE   2.00
 13:29:58.70  +47:16:04.00  NGC 5195              ACIS-S NONE   2.00
 13:42:08.30  +35:39:15.00  NGC 5273              ACIS-S NONE   2.00
 17:55:59.70  +18:20:18.30  NGC 6500              ACIS-S NONE   2.00

===================================================================================

Proposal Number: 01700069            
Proposal Title: A SURVEY OF GRAVITATIONALLY LENSED QUASARS

PI: GORDON GARMIRE                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: Time delays between components of gravitationally lensed quasars
provide a unique and potentially accurate determination of the cosmological
quantities H_o and q_o. Quasars generally have stronger and more rapid variations
in the X-ray band than at lower frequencies so that reliable time delay
measurements should be achievable. High resolution X-ray images are needed both
to resolve the quasar images and to study the mass distribution of the
intervening lensing structure. This observation surveys promising candidates for
later intensive monitoring to obtain time delay measurements.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:14:37.70  +05:34:42.00  MITG J0414+0534       ACIS-S NONE   7.50
 04:14:37.70  +05:34:42.00  MITG J0414+0534       ACIS-S NONE   7.50
 04:14:37.70  +05:34:42.00  MITG J0414+0534       ACIS-S NONE   7.50
 04:14:37.70  +05:34:42.00  MITG J0414+0534       ACIS-S NONE   7.50
 09:11:27.50  +05:50:52.00  RX J0911.4+0551       ACIS-S NONE  30.00
 11:31:56.50  +04:55:49.00  PMN J1131+0455        ACIS-S NONE   7.50
 11:31:56.50  +04:55:49.00  PMN J1131+0455        ACIS-S NONE   7.50
 16:09:06.00  +65:31:60.00  CLASS 1608+656        ACIS-S NONE   7.50
 20:19:17.90  +11:27:13.00  MITG J2019+1127       ACIS-S NONE   7.50
 22:40:30.30  +03:21:31.00  EINSTEIN CROSS        ACIS-S NONE  30.00

===================================================================================

Proposal Number: 01700124            
Proposal Title: HETG OBSERVATIONS OF VARIOUS ACTIVE GALACTIC NUCLEI

PI: Canizares Fabian               
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: Observe 1 BL Lac to see absorption from relativistic jets, 1 AGN to
resolve a possibly broad Fe-K line, 1 Sy 2 to detect and measure emission lines
from hot gas near the nucleus, 1 high z QSO to find Fe-K emission and possible
absorption, 1 high z QSO with damped Ly alpha absorption to see evidence for
X-ray absorption, 1 narrow line Sy 1 galaxy to determine the nature of spectral
features at 1 keV, 1 Sy 1 AGN to measure the emission and resolve absorption due
to warm absorption, and 1 AGN in a cluster of galaxies to find absorption due to
the hot cluster gas.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:35:53.70  -34:17:45.00  MCG -6-30-15          ACIS-S HETG 125.00

===================================================================================

Proposal Number: 01700131            
Proposal Title: OBSCURED QUASARS AND AGN

PI: STEPHEN MURRAY                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: ROSAT and ASCA have revealed a rich variety of quasars and AGN with
highly obscured nuclei. In many cases X-ray spectra are sensitive to material
that is otherwise invisible. We shall obtain prototype spectra of the brightest
source of each type. PHL5200, a Broad Absorption Line Quasar (BALQSO), z=1.98;
PHL 6625 is a z=0.38 Quasar absorbed by the foreground galaxy NGC247; 3C212 is a
red quasar with a weakly ionized absorber; 3C351 has a high ionization absorber.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:58:41.20  +14:09:34.00  3C 212                ACIS-S NONE  20.00
 17:04:41.30  +60:44:30.40  3C 351                ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01700132            
Proposal Title: EXTENDED X-RAY EMISSION AROUND NEARBY SEYFERTS

PI: STEPHEN MURRAY                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We will obtain ACIS-S images of nearby Seyfert galaxies known to have
extended X-ray emission. The alignment of the X-ray structures with the optical
and/or radio features, and the amount of line emission present in the ACIS
spectra, will determine the emission mechanism(s) at work.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 23:18:23.20  -42:22:17.00  NGC 7582              ACIS-S NONE   7.00
 23:18:23.20  -42:22:17.00  NGC 7582              ACIS-S NONE  13.00

===================================================================================

Proposal Number: 01700134            
Proposal Title: STUDIES OF STARBURST GALAXIES

PI: STEPHEN MURRAY                 
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We will use the power of AXAF to resolve the AGn from the surroundiong
starburst in composite nuclei, to study the x-ray properties of discrete
starforming regions in hot spot galaxies and hence the evolution of the
starburst.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 05:07:42.00  -37:30:48.00  NGC 1808              HRC-I  NONE  29.00
 16:52:59.00  +02:24:12.00  NGC 6240              HRC-I  NONE  10.00

===================================================================================

Proposal Number: 01708015            
Proposal Title: X-RAYING THE BRIGHTEST AGN IN THE SKY WITH THE CHANDRA GRATINGS

PI: ANTONELLA FRUSCIONE            
Subject Category: ACTIVE GALAXIES AND QUASARS                       

Abstract: We propose to observe the BLLac Mrk421 as a TOO whenever it reaches an
ultra-high state (2-12 keV flux greater than 20 mCrab). Currenty, Mrk421 is
undergoing a huge flare with a peak flux of 43 mCrab, making it the brightest AGN
in the sky. The flux has reached such a high level (which is a factor of ~3
higher that the average) at only one other time in the past 4 years. High
spectral resolution Chandra HETG and LETG X-ray observations of an AGN in such a
bright state would represent an extraordinary opportunity to study in great
detail not only the gaseous environment surrounding the nucleus, but also the
physical state of possible intervening absorption systems. We we will be allowed
to measure with extreme precision, the ionization degree, the column density, the
temperature, the densi

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:04:27.30  +38:12:31.80  MRK 421               HRC-S  LETG  20.00
 11:04:27.30  +38:12:31.80  MRK 421               ACIS-S HETG  20.00


***********************************************************************************
CLUSTERS OF GALAXIES                              
--------------------------------------------------

===================================================================================

Proposal Number: 01800183            
Proposal Title: SEARCH FOR RECENT MERGER EVENTS IN GALAXY CLUSTERS SHOWING A
RADIO HALO

PI: Roberto Fusco-Femiano          
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to observe three clusters of galaxies with radio halos :
A3667, A2319 and A2255. In the first cluster the extended radio source is located
well outside of the central core, while it is at the cluster center in the other
two clusters. According to a recent hypothesis, the formation of the radio halos
may be attributable to suitable cluster-subcluster merger events and to the
presence of tailed radio galaxies as sources of relativistic electrons. The AXAF
observatory has the capability to identify the observational signatures of recent
merger activity in clusters of galaxies. So, the proposed observations will be
crucial in studying the hyphothesis that recent merger events and the formation
of Mpc-scale radio halos in rich clusters are linked each other.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 20:11:50.00  -56:45:34.00  A3667                 ACIS-I NONE  50.00

===================================================================================

Proposal Number: 01800192            
Proposal Title: THE INTERACTION BETWEEN CLUSTER CENTRAL RADIO SOURCES AND
COOLING FLOWS

PI: CRAIG SARAZIN                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: Central galaxies in rich clusters are sites of cluster cooling flows,
with large masses of gas cooling through X-ray temperatures. Many of these
galaxies host powerful radio sources. Recent evidence suggests a strong
interaction between X-ray gas and radio plasma. The X-ray gas may confine radio
lobes, deflect radio jets, and produce Faraday rotation. The radio lobes may
displace and compress the X-ray gas; this may lead to enhanced cooling and star
formation. We propose AXAF observations of two bright cooling flows (A2029 &
A2052) with strong radio sources to image the interaction region with the radio
source, and to determine the physical state of the X-ray gas. We will also derive
the overall cooling flow properties, including abundance gradients and excess
absorption, if any.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:16:44.40  +07:01:20.00  A2052                 ACIS-S NONE  37.00

===================================================================================

Proposal Number: 01800209            
Proposal Title: A2029: COOLING FLOW OR SHOCKED MERGER EVENT?

PI: JOHN STOCKE                    
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to obtain a high spatial resolution temperature map of the
core of the ``cooling flow'' cluster Abell 2029 to compare with detailed
N-body+Hydro simulations on the same scale. Various pieces of evidence (no
H$\alpha$ emission, no blue starlight, and the presence of a wide-angle-tail
radio source) strongly suggest that the large central X-ray surface brightness
excess is NOT due to a cooling with $\dot{\rm{M}} > 100$ M$_{\odot}$ yr$^{-1}$
but rather due to very hot shocked gas in a cluster-cluster merger. In this
scenario filaments seen in the ROSAT HRI image are shock fronts which will remain
unresolved with the ACIS-I, producing a spectacular AXAF image. The ACIS-I
temperature will discern unambiguously if this cluster is a cooling flow or a
merger event.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 15:10:56.10  +05:44:38.00  A2029                 ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01800216            
Proposal Title: MERGING SUBSTRUCTURES IN NEARBY CLUSTERS OF GALAXIES

PI: JAMES ROSE                     
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to image a nearby rich double cluster of galaxies,
A3125/A3128, with HRC-I. Ground-based optical imaging and spectroscopy, along
with a ROSAT PSPC pointed observation, has established that there are at least
two major mergers of subclusters ongoing in A3125/A3128 at present. Thus this
double cluster represents a particularly favorable case for studying the way in
which merging of substructures proceeds in the rich cluster environment. Our goal
is to use the high spatial resolution of AXAF to resolve shocks and other
transient disturbances in the hot intracluster medium (ICM) of A3125/A3128. These
disturbances in the ICM should provide crucial information towards developing a
comprehensive picture of the cluster merger phenomenon.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:27:22.00  -53:30:00.00  ABELL 3125            ACIS-I NONE  10.00
 03:30:24.00  -52:31:60.00  ABELL 3128            ACIS-I NONE  20.00

===================================================================================

Proposal Number: 01800225            
Proposal Title: AXAF OBSERVATIONS OF CLUSTERS WITH RADIO HALOS

PI: DAVID DAVIS                    
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: Cluster mergers are thought to drive the X-ray evolution of clusters,
but to fully understand these events we need to study young mergers. Classical
signatures of a merger can last for up to 10^9 yrs. Radio halos, which are
thought to be short lived (<10^8 yrs), are now thought to be powered by mergers.
This makes these halos ideal indicators of a young merger. Furthermore, irregular
radio halos are thought to be much younger than symmetric halos. The clusters
with irregular radio halos and high quality X-ray data (A2256 & A754) have had
anomalously hot gas (kT >> 8.5 keV) detected in them. We propose to obtain AXAF
data for the recent-merger candidate A2255, a cluster with an irregular radio
halo and evidence from the ROSAT and ASCA data of an anomalously hot component.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:12:41.50  +64:04:08.00  ABELL 2255            ACIS-I NONE  40.00

===================================================================================

Proposal Number: 01800228            
Proposal Title: X-RAY STRUCTURE OF LENSING CLUSTERS

PI: JOHN HOUCK                     
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: Clusters of galaxies sample rare peaks in the primordial matter
distribution and, because their evolution is sensitive to the underlying
cosmology, accurate cluster mass measurements can place strong constraints on
cosmological models. Using AXAF ACIS-I we will observe a sample of distant
clusters (0.150.5 in the Einstein Extended Medium Sensitivity Survey. This cluster
is in a unique sample of 4 high-z, high-Lx clusters which have been used to test
and severely constrain cosmological models. These are the only high-z clusters
which can be studied in detail by AXAF. Current GTO observations will not go
beyond available ROSAT and ASCA results unless cluster gas is highly filamentary.
Since the cosmological tests rely on assumptions about the Mass-Tx relation, we
propose a multi-wavelength campaign, with existing SZ imaging, CNOC galaxy
catalogs, HST, ROSAT and ASCA data, to exploit AXAF spatial resolution, test
these assumptions, and probe the density structure of gas in a cluster at high
redshift.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:54:10.90  -03:01:07.20  MS 0451.6-0305        ACIS-S NONE  45.00

===================================================================================

Proposal Number: 01800451            
Proposal Title: CLUSTER GRAVITATIONAL LENSES AND THE IMPACT OF COOLING FLOWS.

PI: STEVEN ALLEN                   
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to observe three well-studied cluster gravitational lenses,
which are amongst the most X-ray luminous and massive clusters of galaxies known
at intermediate redshifts, to determine the (mass-weighted) temperature profiles
and total mass profiles in these systems. The observations will permit direct,
accurate measurements of the X-ray gas, total mass and metallicity distributions
in the clusters, from their core regions (on the scale of tens of kpc) out to the
limits of X-ray detection (r ~3Mpc). The data will reveal the impact of cooling
flows on X-ray mass measurements for clusters and elucidate the origin of the
discrepancies between X-ray and strong lensing masses for systems without cooling
flows.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:17:03.40  +39:02:51.00  ABELL 963             ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01800461            
Proposal Title: SUBCLUSTER MERGERS, RADIO RELICS, AND THE COOLING FLOW IN ABELL
85

PI: CRAIG SARAZIN                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: A85 is unusual in having a strong cooling flow and evidence for ongoing
mergers. X-ray substructure and ASCA spectra suggest that a subcluster to the
south (and possibly another to the SW) are colliding with the main cluster. We
will search for shocks and other hydrodynamic features in AXAF images of the
region. The two subclusters coincide with two regions of very low frequency radio
emission. Such "radio halos" may result from shock acceleration during mergers.
We will compare the radio and X-ray images, and limit or detect Inverse Compton
X-ray emission in these regions. Detecting IC would allow the cluster magnetic
field to be derived. We will also study the cooling flow at the cluster center,
and use it to place constraints on the ages and strengths of the mergers.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:41:45.80  -09:22:45.00  A85                   ACIS-I NONE  40.00

===================================================================================

Proposal Number: 01800500            
Proposal Title: HCG 90: THE FORMATION OF THE X-RAY MEDIUM?

PI: GREGORY BOTHUN                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: At optical wavelengths Hickson Compact Group 90 exhibits an
unprecedented amount of diffuse intracluster light whose total luminosity is
approximately 40% of the group luminosity. Three luminous galaxies, including the
hard X-ray source NGC 7172, are currently strongly interacting and merging,
producing a substantial amount of tidal debris which comprises the intracluster
light. Previous ROSAT HRI observations of HCG 90 hint at the presence of weak,
diffuse X-ray emission. We propose to use the AXAF ACIS detector to acquire
better data to confirm that HCG 90 has an extended region of X-ray emission with
very low value of L_x/L_opt indicating that the ICM in this group is just now in
the process of forming and heating as a direct response to strong galaxy-galaxy
interactions.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 22:02:04.00  -31:58:30.00  HCG 90                ACIS-I NONE  50.00

===================================================================================

Proposal Number: 01800515            
Proposal Title: GALAXY CLUSTERS AS COSMOLOGICAL PROBES: DEEP X-RAY AND S-Z
EFFECT IMAGING OF A1995 AND A611

PI: MARSHALL JOY                   
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to make definitive x-ray observations of two distant
clusters of galaxies, A1995 and A611, in order to measure the spatial
distribution of the x-ray emitting intracluster gas and to determine the x-ray
temperature profile within each cluster. These x-ray measurements are important
because they directly address the systematic uncertainties that are inherent in
the use of galaxy clusters and the Sunyaev-Zel'dovich Effect to determine the
cosmic distance scale; they will also allow us to independently determine the
masses of these galaxy clusters, and to place constraints on the cosmological
density parameter, $\Omega_\circ$.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:52:57.50  +58:02:55.20  ABELL 1995            ACIS-S NONE  48.00

===================================================================================

Proposal Number: 01800520            
Proposal Title: DARK CLUSTERS AS GRAVITATIONAL LENSES

PI: GERARD WILLIGER                
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to search for high (z ~ 1) redshift clusters of galaxies in
the field of 5 wide-separation `dark' gravitational lens systems, which serve as
indicators for the presence of massive intervening objects. The discovery and
eventual determination of the space density of these objects has important
consequences for cosmology, in particular for the process of structure formation
in the Universe, and can serve as a discriminator between its diverse scenarios.
We propose a 20 ksec exposure with ACIS-I towards each lens with the goal of
establishing the presence or not of X-ray clusters of galaxies in these fields.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:32:29.20  -01:06:17.00  QB 1429-008A,B        ACIS-I NONE  20.00

===================================================================================

Proposal Number: 01800540            
Proposal Title: GALAXY WINDS VS. COOLING FLOWS IN POOR CLUSTERS

PI: Jack Burns                     
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: Poor clusters may be the best laboratories for studying the effects of
environment on galaxy evolution. Some poor clusters are claimed to have cooling
flows; however, with current satellites, it is impossible to determine if the
central X-ray excess is due to a cooling flow, an AGN, an X-ray luminous galaxy,
or all three. We propose to use the high spectral and spatial resolution of AXAF
to measure temperature and abundance gradients in poor clusters. We will
determine the relative contributions to the central X-ray emission from all three
sources listed above. These observations will also allow us to constrain the
amount of mixing between the central galaxy and the intracluster medium, and the
Lx-Lopt relation for 20-30 idividual galaxies expected to be detected in 3 poor
clusters.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:54:27.50  +41:34:47.00  AWM 7                 ACIS-I NONE  50.00

===================================================================================

Proposal Number: 01800623            
Proposal Title: TOWARDS A UNIVERSAL TEMPERATURE PROFILE AT HIGH REDSHIFT

PI: WILLIAM FORMAN                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose a 50ksec ACIS-I observation of the luminous, relaxed,
cooling flow cluster ZW3146 at z=0.291 to determine accurate gas temperature, gas
density, and heavy element abundance distributions to large radial distances. The
X-ray observations will be supplemented with SZ effect and optical weak lensing
observations. Together, these observations will constrain cosmological cluster
models, test the validity of the universal temperature profile to higher
redshift, determine the importance of non-thermal pressure support for the X-ray
gas, measure iron abundance distributions and the iron mass in the cluster,
detect small scale structure in the cooling core, and determine the radial
dependence of the mass deposition rate in the cooling flow.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:23:39.60  +04:11:10.00  ZW 3146               ACIS-I NONE  50.00

===================================================================================

Proposal Number: 01800625            
Proposal Title: STUDY OF A NEW CLASS OF MASS CONCENTRATIONS IN THE UNIVERSE

PI: ALEXEY VIKHLININ               
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to study 3 members of a newly discovered class of mass
concentrations in the Universe, detected as ROSAT serendipitous extended sources.
These are isolated elliptical galaxies surrounded by extended, massive dark
matter halos typical of small clusters. These objects have estimated M/L and
Mgas/L ratios 5-9 and 2-3 times those of normal clusters, respectively. If high
mass values in these extremely relaxed objects are confirmed by AXAF, their very
existence would have profound implications. In particular, constraints on Omega
from cluster gas fraction and M/L ratios may be invalidated. Also, since there
should have been fewer supernovae per unit gas mass in these objects, they
provide a unique possibility to separate effects of gravity and galaxy feedback
on cluster formation.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:59:51.20  +55:31:56.00  RX J1159+5531         ACIS-I NONE  20.00
 22:47:29.10  +03:37:13.00  RX J2247+0337         ACIS-I NONE  50.00

===================================================================================

Proposal Number: 01800627            
Proposal Title: THE CLUSTER X-RAY TEMPERATURE FUNCTION AT Z>0.6

PI: HARALD EBELING                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: Under very general theoretical assumptions, the evolution of the space
density of clusters of galaxies is extremely sensitive to cosmological
parameters. The most straightforward method of exploiting this sensitivity is
through measurements of the X-ray temperature function. The present fractional
uncertainty on the density parameter using this approach is about 30% based on a
sample of clusters with redshifts less than 0.4. We propose to obtain the
temperatures of a complete sample of clusters with a median redshift of greater
than 0.7. These observations will determine the density parameter substantially
more precisely because of the increased leverage of the higher redshift.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:46:18.00  +85:31:00.00  CL J0046.3+8531       ACIS-I NONE  43.00
 01:52:42.00  -13:57:47.88  CL J0152.7-1357       ACIS-I NONE  37.00
 05:42:50.20  -41:00:06.98  CL J0542.8-4100       ACIS-I NONE  54.00
 11:13:00.00  -26:15:49.00  CL J1113.1-2615       ACIS-I NONE 106.00
 17:20:48.80  +62:10:13.01  CL 1720.8+6210        ACIS-I NONE  20.00
 18:21:38.00  +68:27:51.98  CL J1821.6+6827       ACIS-I NONE  68.00
 23:02:47.50  +08:43:55.00  CL J2302.8+0844       ACIS-I NONE 110.00

===================================================================================

Proposal Number: 01800643            
Proposal Title: MEASUREMENTS OF THE ABSORPTION COLUMN DENSITY DISTRIBUTION AT
THE CENTER OF CLUSTERS OF GALAXIES

PI: YASUSHI FUKAZAWA               
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: The evidences of the excess absorption at the cluster center have
recently been reported for cooling flow clusters. If these are correct, the
cooling flow model becomes more firmly supported. However, due to the limitation
of spectral resolution, energy band, and spatial resolution, the finer
measurements of absorption column density distribution were impossible. Here, we
propose the AXAF measuremensts the absorption column density distribution at the
central region of several cooling flow clusters, in order to estimate the mass of
cooled material and test the ccoling flow model. To determine the column density
finely, we utilize the back-illuminated CCD.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:38:40.50  +09:58:11.60  2A 0335+096           ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01800677            
Proposal Title: BENT-DOUBLE RADIO GALAXIES: SIGNPOSTS FOR THE HIGH DENSITY
UNIVERSE

PI: DAVID HELFAND                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: Bent-double radio galaxies, distorted by their interaction with a dense
intergalactic medium, are unambiguous tracers of the high density Universe. Our
VLA FIRST survey allows us to detect and map these sources to high redshifts for
the first time. From a sample of several hundred FIRST bent doubles, we have
selected ten for followup at Keck and have found that at least eight reside in
clusters with redshifts from 0.35-0.85. This new cluster selection technique
preferentially finds regions with dense intracluster gas, making them ideal
targets for complementing optical- and X-ray-selected clusters in the
construction of the L, T, and M functions for clusters at high z.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:38:24.90  +29:31:05.00  BD CLUSTER 1338       ACIS-I NONE  40.00

===================================================================================

Proposal Number: 01800770            
Proposal Title: THE ORIGIN AND DISTRIBUTION OF HEAVY ELEMENTS IN THE COMPACT
GROUP HCG 62

PI: JAN VRTILEK                    
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: Most galaxies in the present-day Universe are in compact groups and
poor clusters. Groups are thought to be the building blocks from which clusters
formed, and they accordingly occupy an important place in the continuum between
isolated galaxies and rich clusters. We propose an observation of the compact
group HCG 62 with ACIS-S (BI); our purpose is the accurate determination of the
abundances of heavy elements as a function of position in the group. This
observation exploits the high X-ray brightness of this group and --- with only
four members --- its sparseness to understand the relatively low overall
metallicity of the intragroup gas, to test whether any abundance variations are
associated with individual galaxies, and to trace the origin of the enrichment to
type Ia or II SNs.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:53:05.70  -09:12:20.00  HCG 62                ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01800779            
Proposal Title: ACIS IMAGING OF CLUSTER COOLING FLOWS WITH THE LARGEST STAR
FORMATION RATES

PI: BRIAN MCNAMARA                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: The most important question concerning cooling flows in clusters of
galaxies is the fate of the cooling gas. We will reexamine the evidence for
cooling flows in the A2597 and Zw3146 clusters, where the hot gas is apparently
cooling at rates of 350-1350 solar masses per year. Star formation is ongoing in
their central galaxies at rates of 10-100 solar masses per year. We will
determine the state of the hot gas in the cluster cores where star formation is
observed, and we will compare the cooling rates and columns of absorbing gas
directly to the optically-determined star formation rates. We will search for
X-ray emission associated with the radio sources, where accelerated cooling in
displaced, shock-compressed gas may be triggering star formation.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 23:25:19.60  -12:07:27.40  A2597                 ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01800841            
Proposal Title: X-RAY DIAGNOSTICS OF VIRIALIZED GALAXY SYSTEMS AND THE NATURE OF
COMPACT GALAXY GROUPS

PI: Gary Mamon                     
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: X-rays provide diagnostics on the diffuse ICM in virialized galaxy
systems and on the nature of compact galaxy groups (CGs). ROSAT detections,
luminosities and temperatures have been subject to debate. Do spiral-rich compact
groups contain a diffuse and regular ICM, suggesting a virialized core? Are cool
CGs under-luminous relative to the cluster L_X-T relation? Does a prototype
virialized system at 1 keV show irregularities in its temperature and metallicity
maps? We plan to observe four CGs with ACIS: one has never been observed in
pointed observations, one has either cool diffuse emission or none, one appears
very under-luminous relative to its temperature, and one is the prototype
virialized group, with extended, luminous, hot and seemingly regular X-ray
emission.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:09:35.52  -10:11:56.40  HCG 16                ACIS-S NONE  13.00

===================================================================================

Proposal Number: 01800858            
Proposal Title: CLUSTER MASSES AT MODERATE REDSHIFTS

PI: ERICA ELLINGSON                
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose AXAF ACIS observations of four of the the CNOC/EMSS galaxy
clusters at 0.18 < z < 0.55. These clusters have already been used in extensive
studies of the cluster mass profiles via dynamical, X-ray and gravitational
lensing methods. More detailed AXAF observations will allow us to refine our
comparisons between these three methods and resolve discrepancies arising from
spatial and temperature substructure. Extension of the X-ray profiles to larger
radii will allow a more robust determination of the baryon fraction and
baryon-to-light ratios for these clusters. Finally, correlations between galaxy
properties and X-ray gas densities will allow us to investigate environmental
mechanisms for galaxy evolution. We will also make full use of archival
observations of this sample.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:09:12.34  +10:58:30.61  MS 0906.5+1110        ACIS-I NONE  30.00
 10:08:47.77  +11:47:39.98  MS 1006.0+1202        ACIS-I NONE  30.00
 10:10:32.33  -12:39:32.18  MS 1008.1-1224        ACIS-I NONE  45.00

===================================================================================

Proposal Number: 01800926            
Proposal Title: A HAT TRICK IN THE LYNX FIELD: THE INTRACLUSTER MEDIUM AT 0.6 <
Z < 1.3

PI: SPENCER STANFORD               
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to obtain a deep image with ACIS-I of a field containing
three galaxy clusters at 0.6 < z < 1.3, including the highest-redshift non-AGN
cluster. The AXAF image will determine if the known X-ray source at the z=1.3
cluster is extended, resolving the question of whether an intracluster medium is
present. The detection of the Fe-K line and the measurement of the temperature in
all three clusters will provide unprecedented insight into the metal enrichment
and thermal history of the ICM at z > 1. Existing and scheduled observations of
this field, including our NICMOS and WFPC2 imaging and Keck spectroscopy, make it
ideal for multi-wavelength studies of the distant universe. We waive proprietary
rights so as to make a deep AXAF image available to the community during A01.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 08:48:55.90  +44:54:50.00  CL 0848.6+4453        ACIS-I NONE  65.00
 08:48:55.90  +44:54:50.00  CL 0848.6+4453        ACIS-I NONE 125.00

===================================================================================

Proposal Number: 01800929            
Proposal Title: X-RAY ABSORPTION FROM COLD GAS IN THE CLUSTER MS2137.3-2353

PI: MICHAEL WISE                   
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to obtain ACIS imagery of the cluster MS2137.3-2353. We will
measure the soft X-ray absorption due to accumulated cold gas within the cluster.
The amount and spatial distribution of the cold gas will be compared with the
emission from cooling material to determine whether the absorbing cold gas could
have condensed out of the flow. Detection of a significant column of absorbing
gas distributed throughout the cooling region would demonstrate that cooling
flows deposit most of their material in cold clouds. We will attempt to measure
the redshifted O K edge of the cold gas. This measurement would provide
definitive evidence that the cold, absorbing gas lies within the cluster.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 21:40:12.70  -23:39:27.00  MS 2137.3-2353        ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01800954            
Proposal Title: SPATIALLY RESOLVED X-RAY SPECTROSCOPY OF THE BEST LENSING
CLUSTER OF GALAXIES CL0024+17

PI: Makoto Hattori                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: The discovery of the gravitationally lensed images of back-ground
galaxies in distant clusters of galaxies provide a new tool to measure the mass
distributions of clusters of galaxies. It has been claimed that the lensing
estimates of the cluster mass are systematically a factor of 2-5 larger than
those estimated from X-ray observations. Aiming to resolve this problem, a deep
pointed observations of the lensing cluster CL0024+17 which has the most ideal
configuration of the lensed images, is proposed to measure accurate temperature
and X-ray morphology. If CL0024+17 is pointed on the aimpoint of ACIS-S3, a dark
lens system MG0023+171 can be covered by ACIS-S0. Therefore, we propose to
perform X-ray search for dark lens object of MG0023+171 simultaneously by
adjusting a role angle.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:26:36.20  +17:09:43.00  CL 0024+17            ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01800955            
Proposal Title: X-RAY SEARCH FOR DARK GRAVITATIONAL LENSES

PI: Makoto Hattori                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: Within these two decades a plenty of astronomical phenomena which are
caused by gravitational lensing have been reported. In some of those, lensing
objects have not been identified in spite of a relatively deep search for lensing
objects by optical observations and the yet unknown lensing objects are called
"dark lenses". We have been doing a X-ray search for dark lens objects and
successfully identified a distant cluster of galaxies as a dark lens object. In
this proposal, high resolution X-ray search for two dark lens objects are
proposed. For one of the targets, Q2345+007, lensing interpretation for this
system is tested by resolving X-ray emission from two images.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:15:46.20  +11:29:42.80  H1413+117             ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01800962            
Proposal Title: SPATIAL DISTRIBUTION OF ABUNDANCE AND TEMPERATURE IN ABELL 496

PI: RAYMOND WHITE III              
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: Abell 496 shows a central abundance enhancement due to an excess of
supernovae Type I ejecta. The mechanisms that create this SN I material are not
clear. Ram-pressure stripping and normal stellar mass loss are the two competing
mechanisms for generating this SN I excess. We propose to observe the abundance
gradient cluster A496 for 20 kseconds (ACIS-I) with the objective of
discriminating between these two mechanisms for the contamination of the
intracluster gas and determine the spatial extent of the gradient.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 04:33:37.80  -13:15:42.98  ABELL 496             ACIS-S NONE  10.00
 04:33:37.80  -13:15:42.98  ABELL 496             ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01600067            
Proposal Title: THE SHAPE OF THE DARK MATTER DISTRIBUTIONIN NGC 720

PI: GORDON GARMIRE                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: WE PROPOSE TO STUDY THE SHAPE OF THE DARK MATTER DISTRIBUTION IN AN
OPTICALLY FLATTENED LENTICULAR GALAXY, NGC720.  OUR PREVIOUS ROSAT PSPC, ROSAT
HRI AND ASCA OBSERVATIONS HAVE ALREADY SHOWN THE GALAXY CONTAINS A MASSIVE, DARK
HALO THAT IS FLATTENED.  FURTHERMORE, WE SEE CLEAR EVIDENCE OF AN "ISOPHOTAL
TWIST" THAT INDICATES ADDITIONAL COMPLEXITY IN THE GRAVITATIONAL POTENTIAL,
POSSIBLY TRIAXIALITY.  AXAF/ACIS WILL PROVIDE MUCH TIGHTER CONSTRAINTS ON THE
SHAPE OF THE POTENTIAL.  THE ENERGY RESOLUTION WILL ALSO HELP CONSTRAIN ANY
NON-HYDROSTATIC EFFECTS IN THE HOT GAS.  THESE RESULTS WILL HAVE IMPLICATIONS FOR
MODELS OF GALAXY HALO FORMATION AND GALAXY STRUCTURE.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 01:53:00.40  -13:44:18.00  NGC 720               ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01800010            
Proposal Title: THE COOLING FLOW IN A1795

PI: ANDREW FABIAN                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: To determine the structural and spectral properties of the cooling flow
in the cluster A1795 (Allen & Fabian, MN, 286, 583, 1997; Fabian et al ApJ, 436,
L63, 1994). The use of both FI and BI spectra should enable the level of excess
absorption and its covering factor to be well quantified.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:48:52.70  +26:35:27.00  A1795                 ACIS-S NONE  20.00
 13:48:52.70  +26:35:27.00  A1795                 ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01800011            
Proposal Title: THE MASSIVE COOLING FLOW IN A1835

PI: ANDREW FABIAN                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: To determine the structural and spectral properties of the cooling flow
around A1835 (Allen et al, MN, 283, 263, 1996). This includes measurement of the
temperatures of the multiphase medium, excess absorption, any abundance
gradients, interaction with the central.radio source, and the mass profile to
compare with that deduced from lensing.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:01:02.00  +02:52:40.00  A1835                 ACIS-S NONE  10.00
 14:01:02.00  +02:52:40.00  A1835                 ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01800012            
Proposal Title: THE COOLING FLOW IN A2199

PI: ANDREW FABIAN                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: To determine the structural and spectral properties of the cooling flow
in the cluster A2199 (Allen & Fabian, MN, 286, 583, 1997). The use of both FI and
BI spectra should enable the level of excess absorption and its covering factor
to be well quantified.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:28:38.50  +39:33:03.00  A2199                 ACIS-S NONE  20.00
 16:28:38.50  +39:33:03.00  A2199                 ACIS-S NONE  20.00

===================================================================================

Proposal Number: 01800013            
Proposal Title: THE MASSIVE COOLING FLOW IN A2204

PI: ANDREW FABIAN                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: To determine the structural and spectral properties of the massive
cooling flow in A2204 (Peres et al 1997 MN submitted). This includes measurement
of the temperatures of the multiphase medium, excess absorption, and detailed
mass dropout distribution.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:32:47.00  +05:34:33.00  A2204                 ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01800014            
Proposal Title: THE MASSIVE COOLING FLOW IN A2390

PI: ANDREW FABIAN                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: To determine the structural and spectral properties of the massive
cooling flow in A2390 (Pierre et al, A&A, 311, 413, 1996; Allen, MN submitted).
This includes measurement of the temperatures of the multiphase medium, excess
absorption, detailed mass dropout distribution and mass profile for comparison
with lensing models.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 21:53:36.50  +17:41:45.00  A2390                 ACIS-S NONE  10.00
 21:53:36.50  +17:41:45.00  A2390                 ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01800015            
Proposal Title: THE COOLING FLOW IN THE PERSEUS CLUSTER

PI: ANDREW FABIAN                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: To determine the structure and spectral properties of the cooling flow
around NGC1275 in the core of the Perseus Cluster, A426 (Fabian et al ApJ 248,
47, 1981; Fabian et al 1994 ApJ 436, L63). This includes measurement of the
temperatures of the multiphase medium, excess absorption, any abundance gradients
and study of the interaction of the radio lobes with the surrounding gas
(Bohringer et al MN 264, L25, 1993).

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:19:48.50  +41:30:27.00  A426                  ACIS-I NONE   5.00
 03:19:48.50  +41:30:27.00  A426                  ACIS-S NONE  10.00
 03:19:48.50  +41:30:27.00  A426                  ACIS-S NONE  25.00

===================================================================================

Proposal Number: 01800016            
Proposal Title: THE COOLING FLOW IN THE CENTAURUS CLUSTER

PI: ANDREW FABIAN                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: To determine the structure and spectral properties of the cooling flow
around NGC4696 in the core of the Centaurus Cluster (Allen & Fabian, 269, 409,
1994; Fabian et al, ApJ, 436, L63, 1994). This includes measurement of the
temperatures of the multiphase medium, excess absorption, and the abundance
gradients.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:48:48.70  -41:18:44.00  CEN CLUSTER           ACIS-S NONE  10.00
 12:48:48.70  -41:18:44.00  CEN CLUSTER           ACIS-S NONE  30.00

===================================================================================

Proposal Number: 01800017            
Proposal Title: THE MASSIVE COOLING FLOW IN RXJ1347-114

PI: ANDREW FABIAN                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: To determine the structural and spectral properties of the massive
cooling flow in RXJ1347-114 (Schindler et al, A&A, 317, 646, 1996; Allen MN
submitted). This includes measurement of the temperatures of the multiphase
medium, excess absorption, and detailed mass dropout distribution.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 13:47:31.00  -11:45:11.00  RX J1347-114          ACIS-S NONE  10.00
 13:47:31.00  -11:45:11.00  RX J1347-114          ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01800019            
Proposal Title: THE MASSIVE COOLING FLOW IN PKS0745-191

PI: ANDREW FABIAN                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: To determine the structural and spectral properties of the cooling flow
around PKS0745-191 (Fabian et al, 216, 923, 1985; Allen, Fabian & Kneib, MN, 279,
615, 1996). This includes measurement of the temperatures of the multiphase
medium, excess absorption, any abundance gradients, the interaction with the
central radio source and the mass profile for comparison with that determined by
us using lensing data.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 07:47:31.10  -19:17:47.00  PKS 0745-191          ACIS-S NONE  30.00

===================================================================================

Proposal Number: 01800020            
Proposal Title: THE MASSIVE COOLING FLOW IN IRAS09104_4109

PI: ANDREW FABIAN                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: To determine the structural and spectral properties of the massive
cooling flow in IRAS09104+4109 (Fabian & Crawford, MN 274, L63, 1995; Fabian et
al, ApJ, 274, L51, 1994). This includes measurement of the temperatures of the
multiphase medium, excess absorption, detailed mass dropout distribution and
structures at the centre of the flow.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 09:13:45.50  +40:56:29.00  IRAS 09104            ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01800026            
Proposal Title: HIGH RESOLUTION X-RAY SPECTRA OF CLUSTER COOLING FLOWS

PI: CLAUDE CANIZARES               
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: We propose to obtain HETGS data on two bright clusters of galaxies
which show strong evidence for cooling flows. PKS 0745-191 (z

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 07:47:31.30  -19:17:40.00  PKS 0745-191          ACIS-S HETG   9.36
 07:47:31.30  -19:17:40.00  PKS 0745-191          ACIS-S HETG  45.30
 07:47:31.30  -19:17:40.00  PKS 0745-191          ACIS-S HETG  40.40
 14:01:01.90  +02:51:32.00  ABELL 1835            ACIS-S HETG  10.00
 14:01:01.90  +02:51:32.00  ABELL 1835            ACIS-S HETG 127.00

===================================================================================

Proposal Number: 01800048            
Proposal Title: X-RAY PROPERTIES OF A HIGH-REDSHIFT CLUSTER

PI: GORDON GARMIRE                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: The mass of X-ray emitting gas in rich clusters can considerably exceed
the mass in stars, and is enriched in heavy elements. The origin and evolution of
this intracluster medium are not fully understood. This observation of an
X-ray-bright cluster at z = 0.83 will give insight into the mass, temperature and
metal distribution of the medium at an early epoch, as well as measurement of the
gravitational potential.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:56:58.00  -03:37:37.30  EMSS 1054.5-0321      ACIS-S NONE  90.00

===================================================================================

Proposal Number: 01800056            
Proposal Title: RESOLVING THE SHOCK WAVE IN ABELL 3667

PI: STEPHEN MURRAY                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: ROSAT PSPC image of A3667 suggests a shock wave located to the
South-East of the cluster center. The X-ray surface brightness drops by a factor
of 5 within 1' across the shock; the Hugoniot adiabat predicts a 50% temperature
drop. A 100 ksec ACIS-I observation would enable an accurate measurement of the
shock temperature profile (~1keV accuracy will be achieved in 15"x4.5' strips
along the shock). The shock density profile will be resolved because the free
path of electrons,15 kpc, corresponds to 10" at the cluster redshift. Important
information about the ICM can be derived from these observations. For example,
shaper shocks with milder temperature drop are expected if the magnetic fields
are dynamically important.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 20:12:50.30  -56:50:56.99  ABELL 3667            ACIS-I NONE  50.00

===================================================================================

Proposal Number: 01800070            
Proposal Title: A1367: A CLUSTER WITH STRUCTURE

PI: STEPHEN MURRAY                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: A1367 is a unique cluster with multiple "clumps" first observed with
the Einstein Observatory and then with ROSAT. Some of these clumps appear to be
coincident with cluster galaxies, others do not. A high resolution image with CCD
energy resolution will help determine what these clumps really are.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 11:44:37.10  +19:44:58.00  A1367                 ACIS-S NONE  40.00

===================================================================================

Proposal Number: 01800072            
Proposal Title: ACIS STUDY OF DARK MATTER IN CLUSTERS

PI: GORDON GARMIRE                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: Clusters of galaxies are large gravitationally bound systems dominated
by dark matter (DM). The amount and spatial distribution of DM in clusters are
keys to understanding the development of cosmic structure and cosmography. The
gravitational potential of clusters observed here can been mapped in various
ways: strong or weak gravitational lensing of background galaxies,
Sunyaev-Zel'dovich effect, and X-ray gas hydrostatic equilibrium. ACIS will
measure the cluster X-ray surface brightness and temperature profiles, detect
nonuniformities and substructure that will signficantly improve our understanding
of their DM distribution.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:39:53.10  -01:34:45.00  ABELL 370             ACIS-S NONE  90.00
 13:59:50.60  +62:31:04.00  ZWCL 1358+6245        ACIS-S NONE  55.00

===================================================================================

Proposal Number: 01800083            
Proposal Title: THE COOLING FLOW IN THE VIRGO CLUSTER AROUND M87

PI: ANDREW FABIAN                  
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: To determine the structural and spectral properties of the massive
cooling flow in the Virgo cluster (Stewart et al 1984, ApJ 278,536). This
includes measurement of the temperatures of the multiphase medium, excess
absorption, and detailed mass dropout distribution.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:30:49.80  +12:23:32.00  VIRGO CLUSTER         ACIS-I NONE  10.00

===================================================================================

Proposal Number: 01800135            
Proposal Title: MASS DISTRIBUTIONS OF RELAXED CLUSTERS

PI: STEPHEN MURRAY                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: Study of the mass distributions in relatively relaxed, round, clusters
of galaxies. Observe a set of bright clusters to derive the mass distribution,
abundance distribution and compare with other mass estimates (e.g., lensing)

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:58:58.30  +13:34:39.00  A401                  ACIS-I NONE  11.76
 02:58:58.30  +13:34:39.00  A401                  ACIS-I NONE  18.24
 17:04:10.75  +78:37:51.60  A2256                 ACIS-S NONE  11.07
 17:04:10.75  +78:37:51.60  A2256                 ACIS-I NONE  15.00
 17:04:10.75  +78:37:51.60  Discarded             ACIS-I NONE  15.00

===================================================================================

Proposal Number: 01800146            
Proposal Title: DETERMINATION OF H0/Q0

PI: LEON VANSPEYBROECK             
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: These observations form part of a systematic determination of H0 and q0
by combining X-ray observations of distant galaxy clusters with radio
measurements of the Sunyaev Zel'dovich effect.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 00:18:33.86  +16:26:07.75  MS 0015.9+1609        ACIS-I NONE  70.00
 01:02:18.00  +31:47:20.40  CL 0107+31            ACIS-I NONE  55.00
 01:31:53.31  -13:36:41.25  A209                  ACIS-I NONE  10.00
 01:52:48.70  +01:01:08.40  A267                  ACIS-I NONE   0.06
 01:52:48.70  +01:01:08.40  A267                  ACIS-I NONE   8.00
 02:48:03.18  -03:31:40.25  A383                  ACIS-I NONE  10.00
 02:48:03.18  -03:31:40.25  A383                  ACIS-I NONE  20.00
 02:48:03.18  -03:31:40.25  A383                  ACIS-S NONE  20.00
 03:05:31.50  +17:10:06.75  MS 0302.7+1658        ACIS-I NONE  10.00
 04:39:01.20  +07:15:36.00  RX J0439.0+0715       ACIS-I NONE   0.80
 04:39:01.20  +07:15:36.00  RX J0439.0+0715       ACIS-I NONE   2.00
 04:39:01.20  +07:15:36.00  RX J0439.0+0715       ACIS-I NONE   6.30
 04:39:02.29  +05:20:43.75  RX J0439+0520         ACIS-I NONE  10.00
 04:54:09.26  +02:55:21.75  A520                  ACIS-I NONE  10.00
 04:54:10.80  -03:01:08.40  MS 0451.6-0305        ACIS-I NONE  15.00
 07:32:19.95  +31:38:00.25  A586                  ACIS-I NONE  10.00
 08:30:57.40  +65:51:14.40  A665                  ACIS-I NONE  10.00
 08:42:57.80  +36:21:54.00  A697                  ACIS-I NONE  10.00
 09:17:53.20  +51:43:35.75  A773                  ACIS-I NONE  10.00
 09:20:25.65  +30:30:19.75  A781                  ACIS-I NONE  10.00
 09:58:21.36  -11:03:39.60  A907                  ACIS-I NONE  10.00
 11:40:23.30  +66:08:42.00  MS 1137.5+6625        ACIS-I NONE 120.00
 11:55:18.20  +23:24:28.80  A1413                 ACIS-I NONE  10.00
 11:57:17.35  +33:36:39.61  A1423                 ACIS-I NONE  10.00
 12:34:17.28  +09:46:12.00  Z5247                 ACIS-I NONE  10.00
 13:11:29.50  -01:20:09.60  A1689                 ACIS-I NONE  10.00
 14:16:28.80  +44:46:40.80  V1416+4446            ACIS-I NONE  30.00
 14:26:02.20  +37:50:06.00  A1914                 ACIS-I NONE  10.00
 14:57:14.40  +22:20:38.40  MS 1455.0+2232        ACIS-I NONE  10.00
 15:39:41.80  +34:25:01.20  A2111                 ACIS-I NONE  10.00
 16:15:45.77  -06:08:55.00  A2163                 ACIS-I NONE  10.00
 16:23:35.80  +26:33:50.40  MS 1621.5+2640        ACIS-I NONE  30.00
 17:01:23.00  +64:14:09.60  V1701+6414            ACIS-I NONE  55.00
 17:16:52.30  +67:08:31.20  RX J1716.9+6708       ACIS-I NONE  50.00
 17:20:08.90  +26:38:06.00  RX J1720.1+2638       ACIS-I NONE   0.16
 17:20:08.90  +26:38:06.00  RX J1720.1+2638       ACIS-I NONE   2.00
 17:20:08.90  +26:38:06.00  RX J1720.1+2638       ACIS-I NONE   9.00
 17:22:27.60  +32:07:37.20  A2261                 ACIS-I NONE  10.00
 20:56:22.30  -04:37:44.40  MS 2053.7-0449        ACIS-I NONE  45.00
 21:29:39.99  +00:05:23.75  RX J2129.6+0005       ACIS-I NONE  10.00

===================================================================================

Proposal Number: 01800147            
Proposal Title: ACIS STUDY OF DARK MATTER IN CLUSTERS

PI: GORDON GARMIRE                 
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: Clusters of galaxies are large gravitationally bound systems dominated
by dark matter (DM). The amount and spatial distribution of DM in clusters are
keys to understanding the development of cosmic structure and cosmography. The
gravitational potential of clusters observed here can been mapped in various
ways: strong or weak gravitational lensing of background galaxies,
Sunyaev-Zel'dovich effect, and X-ray gas hydrostatic equilibrium. ACIS will
measure the cluster X-ray surface brightness and temperature profiles, detect
nonuniformities and substructure that will signficantly improve our understanding
of their DM distribution.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:35:56.00  +66:12:45.00  ABELL 2218            ACIS-I NONE   7.00
 16:35:56.00  +66:12:45.00  ABELL 2218            ACIS-I NONE  13.00

===================================================================================

Proposal Number: 01800148            
Proposal Title: TEMPERATURE AND STRUCTURE OF A VERY HOT CLUSTER

PI: Van Speybroeck Murray          
Subject Category: CLUSTERS OF GALAXIES                              

Abstract: The cluster 1E0657-56 is the highest temperature known cluster; an
accurate determination of the temperature and structure of this distant cluster
will place useful constraints upon cosmological parameters.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 06:58:37.90  -55:57:00.00  1E 0657-56            ACIS-I NONE  28.00



***********************************************************************************
EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        
--------------------------------------------------

===================================================================================

Proposal Number: 01900341            
Proposal Title: BRIGHT `BLANK FIELD 'X-RAY SOURCES

PI: MARTIN ELVIS                   
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: We are investigating a class of ROSAT X-ray source with extreme
f_x/f_opt (>60). These bright sources (fx>10^-13cgs) have no optical counterparts
on the Palomar Sky survey, hence we call them `Blank Field' X-ray sources. Deep
optical imaging reveals candidates, but chance coincidences with ROSAT error
circles are large at these magnitudes. Possibilities for the nature of blank
field sources include: isolated neutron stars, `failed' clusters, and `diskless'
quasars. AXAF has all the qualities needed to understand these unknown sources:
accurate positions to nail the optical counterparts; CCD spectra to test neutron
star (very soft) vs. cluster or AGN emission; and detailed imaging to distinguish
clusters at any z. We propose short (10ksec) observations of the five best blank
field sources.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:26:57.00  +33:32:51.10  1WGA1226.9+3332       ACIS-S NONE  10.00
 13:40:10.30  +27:43:38.90  1WGA J1340.1+2743     ACIS-S NONE  10.00

===================================================================================

Proposal Number: 01900441            
Proposal Title: M101: DIFFUSE EMISSION, EXTENDED OBJECTS AND POINT SOURCES

PI: STEVEN SNOWDEN                 
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: We propose a multi-purpose observation of M101, a nearby face-on spiral
galaxy with low foreground NH, fulfilling three goals: 1.) The study of the
global distribution of diffuse coronal gas. The high resolution of the AXAF ACIS
will allow removal of point sources to significantly deeper levels than possible
with ROSAT. Thus we can obtain better measures of the diffuse gas at 1/4 keV and
3/4 keV, and place stronger limits on the existence of diffuse gas at 1.5 keV.
2.) The study of extended structures such as superbubbles, allowing resolution of
structures on hundred parsec scales. 3.) The study of the distribution and
luminosity functions of point sources, such as supernova remnants (~2.4e36
ergs/s), low-mass X-ray binaries (~2.8e36), and super-soft sources (~1.3e38).

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 14:03:10.50  +54:21:34.80  M101                  ACIS-S NONE 100.00

===================================================================================

Proposal Number: 01900686            
Proposal Title: AXAF OBSERVATION OF FAINT HARD X-RAY SOURCES DISCOVERED WITH
ASCA

PI: TADAYUKI TAKAHASHI             
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: The origin of the Cosmic X-ray background (CXB) has been one of the key
issues of X-ray astronomy. We propose AXAF observations of 15 selected hard X-ray
sources discovered by the serendipitous source survey project with ASCA. These
sources have 2-10 keV fluxes below 5 x 10^(-13) erg/cm2/s. ASCA 0.7-2/2-10 keV
counting rates that require them to either have power law photon indecies flatter
than 1.0, or if they have intrinsic slopes of 1.7, have column density greater
than Nh = 2 x 10^22/cm^2. For the determination of the nature of the 2-10 keV
source population excellent X-ray positions are absolutely vital to obtain
reliable identifications, in particular if one does not know a priori the nature
of the optical objects.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:23:53.30  +42:12:29.90  AX J0223+4212         ACIS-I NONE   4.00
 04:31:42.90  -05:26:25.80  AX J0431-0526         ACIS-I NONE   4.00
 10:25:54.73  +47:14:29.08  AX J1025+4714         ACIS-I NONE   2.50
 12:27:43.20  +44:21:35.30  AX J1227+4421         ACIS-I NONE   6.00
 15:10:23.40  +07:42:02.20  AX J1510+0742         ACIS-I NONE   5.00
 19:51:00.74  +56:09:37.73  AX J1951+5609         ACIS-I NONE   6.00
 20:18:23.40  +11:39:25.60  AX J2018+1139         ACIS-I NONE   6.50

===================================================================================

Proposal Number: 01900798            
Proposal Title: NGC 4244: SHADOWING THE EXTRAGALACTIC SOFT X-RAY BACKGROUND

PI: Q. DANIEL WANG                 
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: Observing X-ray shadows produced by neutral gas is the most direct way
to decompose the soft X-ray background along a line of sight, therefore to
tighten fundamental limits on various X-ray source populations and hot gas in the
universe. Well-suited for such a shadowing experiment is the gas-rich, edge-on
spiral NGC 4244, which is located in a direction of low Galactic X-ray absorption
and is exceptionally inactive in star formation. The proposed ACIS observation of
the galaxy will enable us to decompose the soft X-ray background in the 0.2-1 keV
range into two separate components: Galactic and extragalactic. This
decomposition is particularly important because it may provide a unique diagnosis
of the thermal and chemical properties of the hot intergalactic medium.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:17:30.00  +37:48:32.00  NGC 4244              ACIS-S NONE  50.00

===================================================================================

Proposal Number: 01900025            
Proposal Title: DEEP SURVEY OF THE LOCKMAN HOLE

PI: STEPHEN MURRAY                 
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: We will perform a Deep Survey of the Lockman Hole to a depth of
1x10^-16 erg/cm^2/sec. Of order 400 sources are expected to be detected within
the HRC "good" filed of view, and the CXRB may be fully resolved. The HRC-I
provides accurate positions and extent information for the sources.
Identifications should be unambiguous through correlations at other wavelengths.
Existing questions about the contributions of NLXGs to the background should be
resolved.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 10:52:43.00  +57:28:48.00  LOCKMAN HOLE          HRC-I  NONE  75.00
 10:52:43.00  +57:28:48.00  LOCKMAN HOLE          HRC-I  NONE 100.00
 10:52:49.00  +57:27:32.00  LOCKMAN HOLE          HRC-I  NONE 125.00

===================================================================================

Proposal Number: 01900037            
Proposal Title: DEEP ACIS OBSERVATION OF THE HUBBLE DEEP FIELD

PI: GORDON GARMIRE                 
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: This observation of the X-ray background will achieve unprecedented
sensitivity to faint X-ray sources, particularly in the 2-10 keV band. Source
counts and arcsecond positions for several hundred sources will be obtained with
spectra and variability for the stronger sources. Combined with the superb
optical images and spectroscopy available for the Hubble Deep Field and flanking
fields, and new spectroscopy where needed, this study should considerably
elucidate the composition and astrophysics of the high-energy cosmic background
radiation.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 12:36:49.40  +62:12:58.00  HUBBLE DEEP FIELD     ACIS-I NONE  59.00
 12:36:49.40  +62:12:58.00  HUBBLE DEEP FIELD     ACIS-I NONE  59.00
 12:36:49.40  +62:12:58.00  HUBBLE DEEP FIELD     ACIS-I NONE  59.00
 12:36:49.40  +62:12:58.00  HUBBLE DEEP FIELD     ACIS-I NONE  59.00

===================================================================================

Proposal Number: 01900098            
Proposal Title: ULTRA DEEP AXAF OBSERVATION WITH ACIS

PI: RICCARDO GIACCONI              
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: We propose to use ACIS-I and ACIS-S to carry out an ultra-deep
observation of a low-HI-column-density southern field with the following
objectives: 1) Further insight into the nature of the sources which constitute
the the extra-galactic X-ray background; 2) The detection and source spectrum of
the most luminous galaxies.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:32:28.00  -27:48:30.00  AXAF Southern Deep F  ACIS-I NONE 141.70
 03:32:28.00  -27:48:30.00  AXAF Southern Deep F  ACIS-I NONE  44.00
 03:32:28.00  -27:48:30.00  AXAF Southern Deep F  ACIS-I NONE  56.30
 03:32:28.00  -27:48:30.00  AXAF Southern Deep F  ACIS-I NONE 100.00

===================================================================================

Proposal Number: 02900076            
Proposal Title: ULTRA DEEP AXAF OBSERVATION WITH ACIS

PI: RICCARDO GIACCONI              
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: We propose to use ACIS/I to carry out an ultra-deep observation of a
low-HI-column-density southern field with the following objectives: 1) Further
insights into the nature of the sources which constitute the extra-galactic X-ray
background; 2) The detection and source spectrum of the most luminous galaxies

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:32:28.00  -27:48:30.00  AXAF SOUTHERN DEEP F  ACIS-I NONE  61.00
 03:32:28.00  -27:48:30.00  AXAF SOUTHERN DEEP F  ACIS-I NONE 107.00

===================================================================================

Proposal Number: 02900378            
Proposal Title: AN ULTRADEEP SURVEY IN THE CHANDRA DEEP FIELD SOUTH

PI: RICCARDO GIACCONI              
Subject Category: EXTRAGALACTIC DIFFUSE EMISSION AND SURVEYS        

Abstract: We propose to exploit the unique combination of angular resolution,
sensitivity and field-of-view of the Chandra ACIS imager to perform the deepest
X-ray survey ever in the well-studied "Chandra Deep Field South" (CDFS). With a
total integration time of 1.5 Msec (request for this AO: 1 Msec) we reach a 0.5-2
keV flux limit of 2E-17 cgs. We aim to detect >500 sources, i.e. AGN to z=10,
clusters to z=3 and starburst galaxies to z~1. Simulations based on the existing
130 ksec observation in the CDFS and realistic source counts and correlation
function models show, that Chandra exposures will not be background or confusion
limited up to 3Msec. We propose to make the Chandra data public immediately.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 03:32:27.50  -27:48:23.00  CDFS                  ACIS-I NONE  31.00
 03:32:27.50  -27:48:23.00  CDFS                  ACIS-I NONE  69.00
 03:32:27.50  -27:48:23.00  CDFS                  ACIS-I NONE 132.00
 03:32:27.50  -27:48:23.00  CDFS                  ACIS-I NONE 132.00
 03:32:27.50  -27:48:23.00  CDFS                  ACIS-I NONE 136.00

***********************************************************************************
GALACTIC DIFFUSE EMISSION AND SURVEYS             
--------------------------------------------------

===================================================================================

Proposal Number: 01910242            
Proposal Title: MEASURING THE AGE OF THE LOCAL BUBBLE BY OBSERVING O VII AND O
VIII EMISSION TOWARDS MBM 12

PI: RANDALL SMITH                  
Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS             

Abstract: We propose to observe the nearby molecular cloud MBM 12, which shadows
70%-95% of the 3/4 keV (0.44-1.21 keV) diffuse background, in order to observe
the foreground emission from O VII and O VIII at 0.57 and 0.65 keV. This will be
the first-ever detection of an identifiable emission line from the Local Bubble.
The O VIII/O VII ratio depends sensitively on the time since the gas was heated
by a shock, and therefore determines the age of the Local Bubble. This
observation will also help distinguish between models of the ISM dominated by hot
or warm gas. If the Local Bubble is young (1e5 yrs) and already large, this
suggests the ISM is filled with hot gas. If it is old (>1e6 yrs), then this would
suggest bubbles do not break out and do not fill the ISM with hot gas.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:55:49.96  +19:29:54.88  MBM 12                ACIS-S NONE 100.00

===================================================================================

Proposal Number: 01910375            
Proposal Title: IS THE 6.4 KEV ISLAND SGR B2 AN X-RAY REFLECTION NEBULA ?

PI: KATSUJI KOYAMA                 
Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS             

Abstract: With ASCA we found an extremely bright 6.4-keV line emitting region at
the molecular cloud Sgr B2: the 6.4-keV island. X-ray spectrum, and spatial
extensions of the island are consistent with those expected by X-ray irradiation
on Sgr B2 from an outside source, hence may be called an X-ray reflection nebula:
a new category of X-ray sources. Limited spatial resolution of ASCA, however,
prevents us quantitative study on this interesting object. With superior
resolving power of AXAF, we propose to study details on it. Main objectives are,
(1) make further confirmation that Sgr B2 X-rays are really due to reflection of
other X-ray source (s) and make a realistic picture of the reflection, (2) search
for star forming activity, and (3) give strong constraint on the irradiating
X-ray source(s).

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:47:06.70  -28:26:47.29  SGR B2                ACIS-I NONE 100.00

===================================================================================

Proposal Number: 01910566            
Proposal Title: THE ASSOCIATION OF THE HOT X-RAY GAS WITH THE NONTHERMAL RADIO
ARC NEAR THE GALACTIC CENTER

PI: FARHAD YUSEF-ZADEH             
Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS             

Abstract: Recent ASCA observations reveal the distribution of diffuse 2-10 keV
continuum emission from the inner 0.2 deg of the Galactic center, in particular,
a weak X-ray counterpart to the unusual radio Arc with their long 15 arcmin
extent and narrow 5-10 arcsec width. The proposed AXAF observations of the Arc
with ACIS-I will examine the nature of the association between radio filaments
and the X-ray gas but also to study if the X-ray counterpart to the synchrotron
radio filaments has any nonthermal characteristics in the X-ray. The correlative
study between the X-ray and radio images has the potential to provide important
clues on the nature of the acceleration of relativistic particles of the
nonthermal filaments and on the nature of high energy activity at the Galactic
center.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 17:46:20.00  -28:52:00.01  GALACTIC CENTER ARC   ACIS-I NONE  50.00

===================================================================================

Proposal Number: 01910675            
Proposal Title: A STUDY OF THE POPULATIONS OF FAINT X-RAY SOURCES IN GLOBULAR
CLUSTERS

PI: WALTER LEWIN                   
Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS             

Abstract: We have known for 15 years that globular clusters contain a population
of faint (Lx < 10^35 erg/sec) X-ray sources in addition to a population of very
bright low-mass X-ray binaries. Only the most luminous members of this faint
source population have so far been detected, however, and their nature is still
unclear. We propose a deep survey of 12 globular clusters to study this
population at detection thresholds one to three orders of magnitude below those
achieved previously. This will allow us to detect substantial numbers of binary
systems of various kinds throughout the clusters. AXAF is ideally suited for this
investigation: its combination of sensitivity and high spatial resolution is
essential for studying these faint sources in their crowded environs.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 16:23:35.50  -26:31:31.10  NGC 6121              ACIS-S NONE  25.00
 17:48:52.60  -20:21:33.80  NGC 6440              ACIS-S NONE  25.00
 19:10:51.80  -59:58:54.80  NGC 6752              ACIS-S NONE  30.00

===================================================================================

Proposal Number: 01910755            
Proposal Title: ORIGIN OF THE GALACTIC RIDGE X-RAY EMISSION

PI: KEN EBISAWA                    
Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS             

Abstract: Origin of the Galactic Ridge X-ray Emission (GRXE) is unknown yet. The
most controversial issue is if GRXE is truly diffuse emission or composed of
numerous point sources. The first imaging observation of GRXE above 2 keV with
ASCA could not clearly answer to this question, being limited by the ASCA XRT
spatial resolution (HPD~3 arcmin). With AXAF, having much superior spatial
resolution, we will be unambiguously give the answer, being able to detect point
sources with a luminosity of ~4x10^{32} erg s^{-1} at 10 kpc. If GRXE is truly
diffuse emission, the interstellar magnetic reconnection is proposed as a
mechanism to heat and confine the hot plasma. We may observe diffuse X-rays
distribute along locally intensified magnetic fields, as observed in the Solar
flares.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:43:57.80  -04:04:45.90  GALACTIC PLANE        ACIS-I NONE  42.00

===================================================================================

Proposal Number: 01910788            
Proposal Title: SURVEYING X-RAY HALOS WITH AXAF: MEASURING CLOUD TOMOGRAPHY AND
GRAIN COMPOSITION

PI: RANDALL SMITH                  
Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS             

Abstract: Dust particles in the interstellar medium have been observed to scatter
X-rays to produce a halo. The detailed dependence of the halo, especially at
small (< 100'') on energy and angular distribution is a function of the physical
properties of the dust particles (size, composition) and the distribution of the
dust along the line of sight. The angular and spectral resolution of AXAF will
allow the determination of these parameters. We propose an initial survey of
three sources: GX 13+1, Cir X-1, the O Star HD 148937. Analysis tools developed
for this program will have important applicability to correct observations of
highly `reddened' compact sources.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 18:14:31.00  -17:09:26.00  GX 13+1               ACIS-I NONE  10.00

===================================================================================

Proposal Number: 01910666            
Proposal Title: ECLIPSES AND HALOS IN THE X-RAY PULSAR 1H0253+193

PI: John Nousek                    
Subject Category: GALACTIC DIFFUSE EMISSION AND SURVEYS             

Abstract: 1H0253+193 is a hard X-ray source, situated by chance directly behind a
dense nearby molecular cloud, MBM~12 (Lynds 1457). 1H0253+193 exhibits sharp,
apparently complete, eclipses, lasting 1990~s and occuring every 21,800~s. These
properties make this an ideal source for studying the size and chemical
composition of interstellar grains via the temporal behavior of the X-ray flux
resulting from dust scattering effects during the eclipse.

                                                        Grat-   Exp. 
R.A.          Dec. (J2000)  Target Name           Det.   ing    Time 
-----------------------------------------------------------------------------------
 02:58:54.40  +19:34:33.90  1H 0253+193           ACIS-S NONE  22.00

Smithsonian Institute Smithsonian Institute

The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA.   Email:   cxchelp@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2017. All rights reserved.