Chandra Large, Very Large and X-ray Visionary Projects

SN, SNR & ISOLATED NS

Proposal Number	Subject Category	PI Name	Title
02500880	SN, SNR AND ISOLATED NS	HESTER	COORDINATED CHANDRA/HST OBSERVATIONS OF THE CRAB NEBULA
03500538	SN, SNR AND ISOLATED NS	Kulkarni	A CHANDRA SURVEY FOR COMPACT OBJECTS IN SUPERNOVA REMNANTS
04500141	SN, SNR AND ISOLATED NS	Slane	A DETAILED STUDY OF 3C58 - THE YOUNGEST KNOWN PULSAR NEBULA IN THE GALAXY
04500223	SN, SNR AND ISOLATED NS	Hughes	STUDYING HIGH MACH NUMBER SHOCKS IN YOUNG SUPERNOVA REMNANTS WITH CHANDRA
04500278	SN, SNR AND ISOLATED NS	Seward	SUPERNOVA REMNANTS IN THE MAGELLANIC CLOUDS
04500813	SN, SNR AND ISOLATED NS	Pavlov	FIRST MEASUREMENT OF THE GRAVITATIONAL REDSHIFT AT THE SURFACE OF A NEUTRON STAR
05500623	SN, SNR AND ISOLATED NS	Hwang	The Cassiopeia A Explosion: Getting at the Core Issues
05500645	SN, SNR AND ISOLATED NS	McCray	Spatially resolved grating spectrometry of the newborn supernova remnant SNR1987A
06500333	SN, SNR AND ISOLATED NS	Slane	The Structure and Composition of Pulsar Winds and their Nebulae
06500496	SN, SNR AND ISOLATED NS	Rutledge	Search for Sub-Millisecond Pulsars in 47 Tuc
06500950	SN, SNR AND ISOLATED NS	van Kerkwijk	Spectra of Neutron Stars with Strongly Magnetized Hydrogen Atmospheres
07500318	SN, SNR AND ISOLATED NS	Park	O-Rich SNR G292.0+1.8: A Textbook Example of a Galactic Core-Collapse SNR
07500764	SN, SNR AND ISOLATED NS	Reynolds	Kepler's Supernova Remnant: Circumstellar Interactions, Particle Acceleration, and Type Ia Supernova Origins
08500520	SN, SNR AND ISOLATED NS	McCray	SPATIALLY RESOLVED LETG SPECTROMETRY OF SNR1987A
08500758	SN, SNR AND ISOLATED NS	Hughes	A Deep Chandra Observation of the Tycho Supernova Remnant
09500471	SN, SNR AND ISOLATED NS	Slane	A Deep Chandra Observation of G54.1+0.3
10500327	SN, SNR AND ISOLATED NS	Reynolds	An Extensive Study of the Youngest Galactic Supernova Remnant G1.9+0.3
10500437	SN, SNR AND ISOLATED NS	Chakrabarty	The Spin and Magnetic Moment of the Neutron Star in Cassiopeia A
10500687	SN, SNR AND ISOLATED NS	Hughes	A Deep Cycle 10 Chandra Observation of the Tycho Supernova Remnant
10500817	SN, SNR AND ISOLATED NS	Pavlov	The Unique Dynamical Vela Pulsar Wind Nebula
10500824	SN, SNR AND ISOLATED NS	Bauer	A Deep HETG Probe of the CSM Interaction in SN1996cr
11500272	SN, SNR AND ISOLATED NS	Park	A Detailed Study of the Aged O-Rich Supernova Remnant 0049-73.6
11500276	SN, SNR AND ISOLATED NS	Park	A Detailed Study of the Type Ia Supernova Remnant G299.2-2.9
12500138	SN, SNR AND ISOLATED NS	Romani	A Survey of PWNe around Narrow-Pulse Gamma-ray Pulsars
12500822	SN, SNR AND ISOLATED NS	Borkowski	Radioactivity, Particle Acceleration, and Supernova Ejecta in the Youngest Galactic SNR G1.9+0.3
13500124	SN, SNR AND ISOLATED NS	Winkler	SN1006: SHOCK PHYSICS, COSMIC-RAY ACCELERATION, AND SN IA EXPLOSIONS
13500316	SN, SNR AND ISOLATED NS	Slane	Bowing to Pressure During the Reformation: A Study of the Composite SNR G327.1-1.1
14500153	SN, SNR AND ISOLATED NS	Romani	A Legacy Study of the Relativistic Shocks of PWNe
14500702	SN, SNR AND ISOLATED NS	Slane	A Detailed Study of the Composite Supernova Remnant MSH 11-62
14500725	SN, SNR AND ISOLATED NS	Reynolds	G11.2-0.3: Core-Collapse Supernova Progenitors, Cosmic Rays, and Pulsar-Wind Nebulae
14500928	SN, SNR AND ISOLATED NS	Kargaltsev	A comparative study of two outstanding pulsar tails

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 02500880

Title: COORDINATED CHANDRA/HST OBSERVATIONS OF THE CRAB NEBULA

PI Name: JEFF HESTER

Recent monitoring of the Crab Nebula with the HST and Chandra sheds new light on both the structure and dynamics of the region into which the wind from the Crab pulsar flows. Bright X-rays predominately originate in regions which contain sharp and highly dynamic structure at visible wavelengths, reflecting the short synchrotron lifetime of the most energetic particles in the nebula. We now have a unique opportunity for an intensive coordinated optical/X-ray campaign to study this dynamic structure. We have an approved and scheduled HST program to monitor the Crab at 11-day intervals during 8 months in the 2000-01 observing season. We request sixteen 25 ks observations with the Chandra ACIS to monitor the X-ray structure and spectrum of Crab during the HST campaign.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
05:34:31.60	+22:00:56.40	CRAB NEBULA	ACIS-S	NONE	200

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 03500538

Title: A CHANDRA SURVEY FOR COMPACT OBJECTS IN SUPERNOVA REMNANTS

PI Name: Shrinivas Kulkarni

It has become increasingly clear that the natal properties of young neutron stars exhibit a rich diversity --- dramatically illustrated by the enigmatic central object in Cas A and hinted at by early 3D modeling of core-collapse. We propose a survey of an objectively constructed sample of nearby SNRs which, when combined with archival data and our vigorous multi-wavelength observation program, will give us a reliable view of the true variety of neutron stars. The ensuing statistics and studies of the central objects will advance our understanding of core-collapse and have bearing on related topics (supernova energetics, natal kicks, etc). We believe that this comprehensive effort, a census of such objects within 5 kpc, will be one of the enduring legacies of the Chandra mission.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
01:28:32.00	+63:06:34.00	G127.1+0.5	ACIS-I	NONE	20
14:42:50.00	-62:28:20.00	G315.4-2.3	ACIS-I	NONE	10
19:38:24.00	+17:17:32.00	G053.6-2.2	ACIS-I	NONE	35
23:59:17.00	+62:26:53.00	G116.9+0.2	ACIS-I	NONE	50
19:33:20.00	+18:58:44.00	G054.4-0.3	ACIS-I	NONE	25
20:52:14.00	+55:20:30.00	G093.3+6.9	ACIS-I	NONE	15
13:50:30.00	-62:06:13.00	G309.8+0.0	ACIS-I	NONE	40
20:53:22.00	+42:27:18.00	G084.2-0.8	ACIS-I	NONE	25
05:26:49.00	+42:57:19.00	G166.0+4.2	ACIS-I	NONE	30

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 04500141

Title: A DETAILED STUDY OF 3C58 - THE YOUNGEST KNOWN PULSAR NEBULA IN THE GALAXY

PI Name: Patrick Slane

3C58 is the youngest known Crab-like SNR in the Galaxy. Chandra observations have uncovered its young pulsar, provided an upper limit to its surface temperature which challenges standard models of NS cooling, and identified the termination shock of its wind. Structures in the nebula indicative of jets and particle outflows have also been revealed. 3C58 thus possesses all of the standard traits of a young pulsar system, and may be a more appropriate "prototype" than the Crab. Based on the foundation built from our initial studies, we propose a definitive X-ray study of 3C58 to study structure on scales of the telescope resolution, perform spectral mapping of the complex emission regions, and obtain a template for future studies of this remnant of SN 1181 at other wavelengths.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
02:05:37.00	+64:49:48.00	3C58	ACIS-S	NONE	350

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 04500223

Title: STUDYING HIGH MACH NUMBER SHOCKS IN YOUNG SUPERNOVA REMNANTS WITH CHANDRA

PI Name: John Hughes

We propose deep imaging of the full extents of the young supernova remnants SN1006, Tycho, and G292.0+1.8. These images are optimized for proper motion measurements for which Chandra's superb angular resolution is uniquely suited and will yield significant results when compared to earlier Chandra, ROSAT, and Einstein images. The new X-ray data, in conjunction with our new radio observations, will address questions concerning the physics of ultra-high-Mach-number collisionless shocks, the efficiency of cosmic-ray acceleration, the dynamics of ejecta-dominated SNRs, and the small-scale structure of SN ejecta. These observations will serve as a legacy of the Chandra mission and will provide invaluable data for future research on SNRs and cosmic rays.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
15:02:55.00	-41:55:30.00	SN1006	ACIS-I	NONE	220
00:25:19.00	+64:08:10.00	TYCHO'S SNR	ACIS-I	NONE	150

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 04500278

Title: SUPERNOVA REMNANTS IN THE MAGELLANIC CLOUDS

PI Name: Frederick Seward

Chandra has now observed 20 of the brightest remnants in the Magellanic Clouds. Because the distances are known and the absorption low, this set is going to yield definitive data on remnant characteristics and evolution. We propose to observe 6 more remnants in the LMC. All are fainter and some are larger than those in the observed sample. We expect to see faint central sources and previously unobserved structure. These observations will span a region of parameter space not covered in the presently-observed sample aad will include some remnants with unique interesting features.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
05:40:00.00	-69:44:15.00	0540-697	ACIS-S	NONE	21
05:31:60.00	-71:00:20.00	0532-710 [N206]	ACIS-S	NONE	68
05:50:40.00	-68:21:30.00	0550-683	ACIS-S	NONE	68
04:54:33.00	-67:12:48.00	0454-672 [N9]	ACIS-S	NONE	68

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 04500813

Title: FIRST MEASUREMENT OF THE GRAVITATIONAL REDSHIFT AT THE SURFACE OF A NEUTRON STAR

PI Name: George Pavlov

Chandra observations of 1E1207.4-5209, the neutron star (NS) in the PKS 1209-51/52 SNR, allowed us to discover absorption features in the NS thermal spectrum. This discovery provides a unique opportunity to measure the NS mass and radius and constrain the equation of state. We interpret the features as lines of once-ionized helium formed in the NS atmosphere with a magnetic field of 150 Teragauss, which implies a radius of 9-14 km for a one-solar-mass NS. To measure accurate line energies and resolve potentially multiple lines blended in the low-resolution CCD spectrum, we propose a deep observation with ACIS/LETG. This observation will provide a high-resolution phase-resolved spectrum, required for precise measurement of the NS mass and radius.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
12:10:00.80	-52:26:25.10	1E 1207.4-5209	ACIS-S	NONE	40
12:10:00.80	-52:26:25.10	1E 1207.4-5209	ACIS-S	LETG	260

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 05500623

Title: The Cassiopeia A Explosion: Getting at the Core Issues

PI Name: Una Hwang

We propose a deep 1 Ms observation of the core-collapse remnant Cas A as a unique and important legacy of the Chandra Observatory. These data may be used to construct an observational nucleosynthesis curve giving composition by mass for all the X-ray emitting ejecta, and to study explosion asymmetries, turbulent mixing, particle acceleration, and the compact remnant. Particularly for a detailed study of the various processes that produce and distribute the heavy elements in a core-collapse explosion, Cas A is perhaps the best candidate target. Important results have been obtained with the existing <50 ks observations, but true breakthroughs may be expected with a much deeper exposure that allows us to study nucleosynthesis and core-collapse using Chandra's full spatial resolution.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
23:23:26.70	+58:49:03.00	Cassiopeia A	ACIS-S	NONE	1000

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 05500645

Title: Spatially resolved grating spectrometry of the newborn supernova remnant SNR1987A

PI Name: Richard McCray

We propose to obtain spatially resolved spectra of the newborn supernova remnant SNR1987A with the ACIS-S/LETG on Chandra. The spectra will provide sufficient counts in several emission lines so that we can, for the first time, directly measure the velocity of the supernova blast wave through line profiles, and the electron temperature through line ratios, as functions of position. We will develop hydrodynamical models to interpret the dispersed X-ray spectra as well as complementary X-ray imaging data and UV and optical images and spectra from the HST and radio images from the Australia Telescope Compact Array.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
05:35:28.00	-69:16:11.10	SNR1987A	ACIS-S	LETG	300

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 06500333

Title: The Structure and Composition of Pulsar Winds and their Nebulae

PI Name: Patrick Slane

Chandra studies of pulsar wind nebulae have revealed stunning new information on the composition of the winds, the presence of jets and equatorial outflows, and the structure in and around the wind termination shock. Monitoring observations reveal temporal variations in resolved structures that challenge our understanding of particle acceleration and energy flow in these systems. Here we propose deep observations of G54.1+0.3 and PSR B1509-58 in order to probe the complex structure in their interior regions at arcsecond resolution. These observations will allow us to measure the spectrum and morphology of these features in order to constrain models for particle acceleration, the formation and structure of jets, and the geometry of particle flows in PWNe.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
15:13:55.60	-59:08:08.90	PSR B1509-58	ACIS-I	NONE	190

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 06500496

Title: Search for Sub-Millisecond Pulsars in 47 Tuc

PI Name: Robert Rutledge

We propose an observation with the ability to detect multiple isolated sub-millisecond pulsars among the unidentified X-ray sources in 47 Tuc, with significant secondary science. Observations in the X-ray band overcome the limited time resolution of even the best radio observations, allowing for the first time the setting of a new ``speed record'' for pulsars at sub-ms periods, below the now 20-year-old record of P = 1.558 ms. The detection of sub-ms pulsars would rule out equations of state for dense matter, provide even better clocks for their many physics applications, and create a strong impetus for future improvement of observational techniques. The absence of sub-ms pulsars would provide compelling evidence for a spin period limit.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
00:24:05.20	-72:04:49.90	47 Tuc	HRC-S	NONE	800

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 06500950

Title: Spectra of Neutron Stars with Strongly Magnetized Hydrogen Atmospheres

PI Name: Marten van Kerkwijk

Neutron stars are unique laboratories for matter at extreme densities and magnetic field strengths. Much of the physics is encapsulated in neutron star spectra, but until recently no suitable sources were known. However, over the last year photospheric absorption features - likely due to hydrogen in strongly magnetized atmospheres - have been found for three nearby neutron stars. We propose to obtain high-quality, 300 ks LETG spectra of the two brightest sources. These data will allow examination of the absorption features and permit searches for other associated features. With detailed understandings of these lines one could measure the surface magnetic fields, compositions and temperatures, eventually leading to direct constraints on the equation of state at supra-nuclear densities.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
07:20:25.00	-31:25:50.20	RX J0720.4-3125	HRC-S	LETG	300

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 07500318

Title: O-Rich SNR G292.0+1.8: A Textbook Example of a Galactic Core-Collapse SNR

PI Name: Sangwook Park

G292.0+1.8 is the only Galactic supernova remnant (SNR) known to exhibit all the expected characteristics of a core-collapse SNR: stellar ejecta enriched in oxygen, an active pulsar and its wind nebula, and evidence for blast wave interaction with circumstellar material. G292.0+1.8 thus provides an invaluable opportunity for the study of nucleosynthesis and the shock evolution of core-collapse SNRs. We have commenced such a study with our initial Chandra observations of G292.0+1.8. In order to continue the study of this important object, we propose a Chandra Large Project (LP) of G292.0+1.8. The proposed observations will probe the structure of this SNR in unprecedented detail, and will provide an ideal complementary program to the existing Chandra Very Large Project of Cassiopeia A.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
11:24:39.10	-59:16:20.00	G292.0+1.8	ACIS-I	NONE	530

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 07500764

Title: Kepler's Supernova Remnant: Circumstellar Interactions, Particle Acceleration, and Type Ia Supernova Origins

PI Name: Stephen Reynolds

Recent work implies that Kepler's supernova remnant resulted from a Type Ia event, but circumstellar medium (CSM) interaction is also evident. Neither the progenitors nor the detailed explosion mechanisms of SNe Ia are understood, so Kepler offers us a unique opportunity to constrain the progenitor by studying CSM interactions, and the explosion mechanism by studying ejecta. We propose a 750 ks observation, to map the Fe K alpha line on spatial 5" scales, and obtain high-quality spectra in brighter regions on 8" scales. Fe K will map ejecta and discriminate thermal and nonthermal emission at rims. K lines of other alpha elements will show stratification; all should show Doppler broadening to characterize dynamics. A deep observation of Kepler should be a legacy of Chandra.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
17:30:42.00	-21:29:00.00	Kepler's Supernova Remnant	ACIS-S	NONE	750

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 08500520

Title: SPATIALLY RESOLVED LETG SPECTROMETRY OF SNR1987A

PI Name: Richard McCray

We will obtain a spatially resolved LETG spectrum of the newborn supernova remnant SNR1987A. This observation will complement a 270 ks GTO observation of SNR1987A with the HETG. The proposed observations will provide spatial information to interpret the HETG observations and will measure the spectrum at wavelengths > 15 A where the HETG lacks sensitivity. With a projected source > 3 times brighter than it was during our Cycle 5 observation, we will be able to measure for the first time how the temperature distribution and kinematic velocity of the shocked gas has changed and how these parameters vary spatially around the ring-like source. The proposed observation is part of a large multi-wavelength campaign of observations with Spitzer, HST, and ground-based observatories.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
05:35:28.00	-69:16:11.10	SNR1987A	ACIS-S	LETG	300

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 08500758

Title: A Deep Chandra Observation of the Tycho Supernova Remnant

PI Name: John Hughes

We propose to obtain a very deep observation of the Tycho supernova remnant. Our observational goals include measuring the angular expansion of the forward shock and contact discontinuity, investigating the nature and origin of Fe-rich ejecta knots, and studying the spectral structure of the forward shock. For the expansion measurement we will compare to an existing Chandra observation taken in cycle 4 that was specifically optimized for subsequent expansion measurements. Tycho is the ideal remnant for studies of cosmic-ray modified dynamics and investigating key features of Type Ia supernova physics.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
00:25:19.00	+64:08:10.00	Tycho's SNR	ACIS-I	NONE	150

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 09500471

Title: A Deep Chandra Observation of G54.1+0.3

PI Name: Patrick Slane

Chandra observations of pulsar wind nebulae have revolutionized our understanding of these systems, revealing a wide variety of complex structures that all relate to the basic conversion of spin-down power to an axisymmetric wind with collimated outflows. Based on initial observations, G54.1+0.3 displays Doppler-brightened emission from the wind termination shock region, large-scale jets that form the elongated structure of the nebula, and faint emission that hints at a possible torus as well as large-scale filamentary structure. We propose a Chandra Large Project to obtain deep observations of G54.1+0.3 in order to resolve these structures, study their spectra, and derive properties related to flow conditions and the magnetic field structure of the nebula.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
19:30:30.20	+18:52:14.20	G54.1+0.3	ACIS-S	NONE	300

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 10500327

Title: An Extensive Study of the Youngest Galactic Supernova Remnant G1.9+0.3

PI Name: Stephen Reynolds

We have recently discovered that the smallest Galactic supernova remnant (SNR) in angular size, G1.9+0.3, is the youngest (known) Galactic SNR, with an age of about 100 years. The X-ray spectrum is lineless, well described by synchrotron emission with the highest rolloff frequency ever reported for a SNR. We propose a 500 ks Large Project observation of this unique object, which fills in a gap between SN 1987A (21 yr old) and Cas A (about 330). We wish to study detailed morphology, to compare with the 3 other Galactic synchrotron- dominated SNRs; spectra, to search for spatial variations and thermal emission; and variability, using this study for the first epoch. This object has enormous potential for the study of SNR hydrodynamics and strong-shock physics.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
17:48:45.00	-27:10:00.00	G1.9+0.3	ACIS-S	NONE	250

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 10500437

Title: The Spin and Magnetic Moment of the Neutron Star in Cassiopeia A

PI Name: Deepto Chakrabarty

How do the spin and magnetic moment of a neutron star relate to the properties of its massive progenitor and the supernova explosion? The best opportunity to study this question is the Cas A point source, the youngest known (300 yr) Galactic compact object. Its spectrum is unlike the classical Crab pulsar's, but is instead similar to both the more strongly magnetic "magnetars" and more weakly magnetic young pulsars. Much has been inferred about its progenitor and the supernova explosion from detailed studies of the supernova remnant. We propose to obtain a 500 ks HRC-S observation of the Cas A central point source, combining 350 ks of GO time and 150 ks of GTO time, in order to search for coherent pulsations down to the practical sensitivity limit of any current X-ray mission.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
23:23:27.90	+58:48:42.50	Cas A CCO	HRC-S	NONE	350

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 10500687

Title: A Deep Cycle 10 Chandra Observation of the Tycho Supernova Remnant

PI Name: John Hughes

We propose to obtain a very deep observation of the Tycho supernova remnant. Our observational goals include investigating the nature and origin of Fe-rich ejecta knots, and studying the spatial, spectral and temporal evolution of the nonthermal emission from the forward shock. Tycho is the ideal remnant for studies of cosmic-ray modified dynamics and for investigating key features of Type Ia supernova physics.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
00:25:19.00	+64:08:10.00	Tycho's SNR	ACIS-I	NONE	750

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 10500817

Title: The Unique Dynamical Vela Pulsar Wind Nebula

PI Name: George Pavlov

Chandra observations of the Vela pulsar-wind nebula (PWN) have revealed intriguing features in its structure and shown that the PWN brightness, shape, and spectrum change on a timescale as short as one week. Taking advantage of the known variability timescale, we propose a series of optimally sequenced observations to understand the PWN topology, dynamics, spectral structure, and interaction with the ambient matter.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
08:35:20.70	-45:10:35.70	Vela PWN	ACIS-S	NONE	320

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 10500824

Title: A Deep HETG Probe of the CSM Interaction in SN1996cr

PI Name: Franz Bauer

SN1996cr is one of the closest and X-ray brightest SNe detected on the sky. Like SN1987A, it appears to have exploded into a wind-blown bubble, sparking a unique temporal evolution wherein its X-ray flux has increased for >8 years now. Serendipitous HETG data allow us to identify several strong, broad, asymmetric emission-line complexes in SN1996cr, although their low-signal leaves much to interpretation. We propose a deep HETG observation of SN1996cr to resolve these emission lines and elucidate their nature (velocity structure, line diagnostics, abundances). It is imperative to observe SN1996cr while it remains bright, as it is the only SN beside SN1987A where such an observation is practical and in many ways is more representative of CSM-interacting core-collapse SNe.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
14:13:10.00	-65:20:44.50	SN1996cr	ACIS-S	HETG	500

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 11500272

Title: A Detailed Study of the Aged O-Rich Supernova Remnant 0049-73.6

PI Name: Sangwook Park

O-rich supernova remnants (SNRs) provide an excellent opportunity for the study of core-collapse (CC) nucleosynthesis and the late-stage evolution of a massive star. While young O-rich SNRs (e.g., Cas A and G292.0+1.8) are being extensively studied, such studies are intrinsically limited because the early-stage of the blast wave and reverse shock may not reveal the full nature of metal-rich ejecta and the surroundings. Studies of relatively old O-rich SNRs are essential for a comprehensive understanding of CC SNRs, complementing those of young SNRs. The old O-rich SNR 0049-73.6 is a perfect example for such a study, revealing both high- and low-Z ejecta and well-evolved blast wave. Thus, we propose a deep 450 ks ACIS observation of 0049-73.6 for a detailed X-ray imaging spectroscopy.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
00:51:07.00	-73:21:30.00	SNR 0049-73.6	ACIS-S	NONE	450

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 11500276

Title: A Detailed Study of the Type Ia Supernova Remnant G299.2-2.9

PI Name: Sangwook Park

Supernova remnant (SNR) G299.2-2.9 is a unique example of the Type Ia SNR which allows us a detailed 2-D spectral study for both of the metal-rich ejecta and ambient structures. Such studies of the ejecta and ambient medium are essential to reveal the detailed SNe Ia explosion mechanisms and their specific environments, which would critically impact their utility in cosmology. The proposed studies of both of the Type Ia SN ejecta and ambient structures cannot be performed with young historical Type Ia SNRs, and the mid-aged Type Ia SNR G299.2-2.9 provides a unique opportunity. Thus, we propose a 640 ks Chandra observation of G299.2-2.9. The proposed observation will serve a legacy which will be an essential basis for a high resolution spectroscopy of Type Ia SNRs with IXO and Astro-H.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
12:14:50.00	-65:28:25.00	G299.2-2.9	ACIS-I	NONE	640

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 12500138

Title: A Survey of PWNe around Narrow-Pulse Gamma-ray Pulsars

PI Name: Roger Romani

We propose here, on behalf of the Fermi LAT team, ACIS observations of the X-ray counterparts of six unusual gamma-ray pulsars discovered by the LAT. The targets, four seen only in the gamma-rays, two also radio-detected, have unusual single or narrow double pulse profiles, which require particular emission geometries for different pulsar models. By measuring the arcsecond-scale structure of the wind nebula termination shocks of these young (<100kyr) objects, CXO can pin down the viewing angle and test the pulsar physics. All have known X-ray fluxes and we can also extract spectral and distance estimates needed to interpret the GeV gamma-rays. The survey sample covers a range of ages, spindown powers and expected inclinations, making it a powerful test of pulsar emission models.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
14:20:08.20	-60:48:16.60	J1420-6048	ACIS-I	NONE	90
18:09:50.20	-23:32:22.90	J1809-2332	ACIS-I	NONE	30
17:18:13.60	-38:25:18.10	J1718-3825	ACIS-S	NONE	40

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 12500822

Title: Radioactivity, Particle Acceleration, and Supernova Ejecta in the Youngest Galactic SNR G1.9+0.3

PI Name: Kazimierz Borkowski

X-rays in G1.9+0.3 are produced primarily by energetic electrons accelerated in its very fast blast wave. However, the radio-bright but X-ray faint northern shell shows prominent thermal emission from supernova ejecta. Doppler broadening velocities are of order 26,000 km/s. An additional spectral line at 4.1 keV is emitted by radioactive 44Sc produced by the electron-capture decay of 44Ti. The line flux implies an initial mass of 44Ti synthesized in the explosion of 1.9 x 10-5 solar masses. The spatial distribution of 44Sc hints at an asymmetric explosion. We propose a 1 Ms Chandra observation, with the primary goal of mapping 44Sc emission. This observation will establish the degree of asymmetry of the explosion, and may distinguish between core-collapse and Type Ia origin for G1.9+0.3.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
17:48:45.00	-27:10:00.10	G1.9+0.3	ACIS-S	NONE	1000

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500124

Title: SN1006: SHOCK PHYSICS, COSMIC-RAY ACCELERATION, AND SN IA EXPLOSIONS

PI Name: P. Winkler

Remnant of the brightest SN in recorded history, SN1006 is the object where the connection between SNR shocks and cosmic rays was first confirmed observationally. It is the closest and least absorbed of all the historical SNRs--yet it has been the least observed by Chandra. We propose deep ACIS observations to: 1) measure proper motions (through comparison with earlier data) to give the shock velocity around most of the shell; 2) elucidate the physics of nonthermal shocks and diffusive acceleration in unprecedented detail; and 3) study small-scale ejecta knots within SN1006 to obtain abundances and constrain the explosion properties. The new data will complete deep coverage for the entire SN1006 remnant, so deep studies of all the historical SNIa remnants will at last be in the archive.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
15:02:20.30	-41:46:38.00	SN1006 NW	ACIS-S	NONE	90
15:01:37.00	-41:59:00.00	SN1006 W	ACIS-I	NONE	100
15:02:08.50	-42:07:00.00	SN1006 SW	ACIS-I	NONE	100
15:03:05.00	-42:08:60.00	SN1006 S	ACIS-I	NONE	100
15:02:52.20	-41:56:16.00	SN1006 CTR	ACIS-I	NONE	100
15:03:14.80	-41:42:45.00	SN1006 N	ACIS-I	NONE	100
15:03:51.00	-42:03:30.00	SN1006 SE	ACIS-I	NONE	100

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500316

Title: Bowing to Pressure During the Reformation: A Study of the Composite SNR G327.1-1.1

PI Name: Patrick Slane

G327.1-1.1 is a composite supernova remnant whose pulsar wind nebula is defined by an offset radio nebula and a cometary X-ray nebula surrounding a neutron star that appears to be moving rapidly through the remnant. Complex structures indicate that the PWN has been disrupted by the reverse shock of the SNR, and that the nebula is re-forming while being swept back into a bowshock-like morphology by the pressure associated with its rapid motion. The manner in which a PWN evolves through such a stage determines the ultimate spectrum of its relativistic particles, and the process by which they eventually escape into the ISM. We propose a deep Chandra observation of G327.1-1.1 in order to study its complex spectral and spatial structure during this crucial phase of evolution.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
15:54:37.60	-55:05:49.70	G327.1-1.1	ACIS-I	NONE	350

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500153

Title: A Legacy Study of the Relativistic Shocks of PWNe

PI Name: Roger Romani

We propose deep ACIS observations of five pulsar wind nebulae (PWNe) with kyr-Myr ages. These carefully chosen targets show a high degree of axial symmetry in existing short ACIS images, so that the proposed imaging/spectroscopic studies can probe the geometry of the termination shock and the nature of the post-shock flow. Partitioning the exposure, we will also constrain instability growth and flow speed. By extending our view of PWN dynamics and evolution beyond the spectacular Crab and Vela nebulae, this legacy data set probes the mechanisms converting rotational energy to relativistic jet/torus outflow, key to astrophysical sources on many scales. Multiwavelength studies and modeling will also reveal parameters of the underlying pulsar accelerator and the wind-environment interaction.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
03:58:53.70	+54:13:13.70	PSR J0358+5413	ACIS-I	NONE	400
06:33:54.20	+17:46:12.90	PSR J0633+1746	ACIS-I	NONE	600
17:41:57.30	-20:54:11.80	PSR J1741-2054	ACIS-S	NONE	300

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500702

Title: A Detailed Study of the Composite Supernova Remnant MSH 11-62

PI Name: Patrick Slane

MSH 11-62 is a remarkable example of an evolved core-collapse supernova remnant. It appears to be evolving in a wind-blown cavity created by its massive progenitor, shows evidence for energetic particles accelerated by the SNR shock and for ejecta heated by the reverse shock, and is accompanied by a neutron star powering a bright pulsar wind nebula that is apparently being disrupted by the supernova remnant reverse shock. We propose a deep Chandra observation to turn our qualitative picture of this remnant into a quantitative investigation of its ambient medium, ejecta profile, and pulsar wind nebula structure. We will use these measurements to model the evolution of the system, constrain the properties of its progenitor, and address the nature of its gamma-ray emission.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
11:11:48.00	-60:37:60.00	MSH 11-62	ACIS-I	NONE	375

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500725

Title: G11.2-0.3: Core-Collapse Supernova Progenitors, Cosmic Rays, and Pulsar-Wind Nebulae

PI Name: Stephen Reynolds

We propose a 400 ks observation of the young supernova remnant G11.2-0.3, a shell containing a pulsar-wind nebula and known pulsar, to address fundamental issues of core-collapse supernovae. Our observation should allow the determination of expansion proper motions and search for variability in the PWN; a sensitive search for thin rims of synchrotron X-ray emission; and greatly improved spectral characterization of shell emission, ejecta knots ahead of the blast wave, and mysterious interior thermal emission. G11.2-0.3 may be the remnant of a Type IIL/b (partially stripped) supernova, in which case our observations can constrain the nature of the progenitor wind, as well as give information on shock acceleration of electrons and the evolution of the interior pulsar-wind nebula.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
18:11:29.40	-19:25:25.00	G11.2-0.3	ACIS-S	NONE	400

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 14500928

Title: A comparative study of two outstanding pulsar tails

PI Name: Oleg Kargaltsev

Long pulsar tails detected in X-rays and radio are believed to result from the supersonic motion of pulsars through the ISM. The processes responsible for the tail formation, collimation, and stability are poorly understood. Short Chandra observations of two outstanding pulsar tails allowed us to characterize their general properties, but much remains to be learned about the complex physics of magnetized collimated flows. We propose much deeper observations of these two tails which show very different properties. We will measure their shapes and internal structures, perform definitive spatially-resolved spectroscopy, and study the connection with the radio tails. The results will advance our understanding of magnetized collimated outflows and their interaction with the ambient medium.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
15:09:27.10	-58:50:56.10	PSR J1509-5850 nebula	ACIS-I	NONE	380
17:47:25.90	-29:59:58.00	The Mouse	ACIS-I	NONE	120

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