Accepted Cycle 13 Observing Proposals

SN, SNR & ISOLATED NS

Proposal Number	Subject Category	PI Name	Title
13500026	SN, SNR AND ISOLATED NS	Garmire	Snap-shot survey of new galactic gamma-ray sources
13500027	SN, SNR AND ISOLATED NS	Kaastra	A timing and spectral imaging observation of the soft gamma-ray pulsar IGR J18490-0000
13500034	SN, SNR AND ISOLATED NS	Canizares	Puppis A: the Micro-X Calorimeter Field of View 2012
13500072	SN, SNR AND ISOLATED NS	Burrows	Chandra Cycle 13 Spatial and Spectral Monitoring of SNR 1987A
13500078	SN, SNR AND ISOLATED NS	Predehl	RXJ0720.4-3125: a precessing isolated neutron star?
13500093	SN, SNR AND ISOLATED NS	Weisskopf	Spatially-Resolved Spectroscopy of the IC443 Pulsar Wind Nebula and Environs
13500124	SN, SNR AND ISOLATED NS	Winkler	SN1006: SHOCK PHYSICS, COSMIC-RAY ACCELERATION, AND SN IA EXPLOSIONS
13500127	SN, SNR AND ISOLATED NS	Tiengo	Measuring magnetar distance from the dust echo of a bright burst
13500159	SN, SNR AND ISOLATED NS	Bernardini	Unveiling the nature of cyclic behavior in the period evolution of the Anomalous X ray Pulsar XTE j1810-197
13500163	SN, SNR AND ISOLATED NS	Katsuda	Expansion Measurements of the Southwestern Rim of RCW86
13500195	SN, SNR AND ISOLATED NS	Halpern	Measuring the Spin-Down and Dipole Magnetic Field of the CCO Pulsar 1E 1207.4-5209
13500196	SN, SNR AND ISOLATED NS	Halpern	The Energetic New Magnetar in HESS J1713-381/CTB 37B
13500202	SN, SNR AND ISOLATED NS	Weisskopf	Joint Chandra and HST Monitoring of the Crab Nebula
13500205	SN, SNR AND ISOLATED NS	Weisskopf	Pre-Planned Target of Opportunity Observations of the Crab Nebula upon the Occurrence of the Next Gamma-Ray Flare
13500310	SN, SNR AND ISOLATED NS	Pooley	Chandra Observations of New X-ray Supernovae
13500311	SN, SNR AND ISOLATED NS	Lopez	Probing the Unique Morphology and Plasma Conditions of W49B with Chandra
13500316	SN, SNR AND ISOLATED NS	Slane	Bowing to Pressure During the Reformation: A Study of the Composite SNR G327.1-1.1
13500433	SN, SNR AND ISOLATED NS	Rea	PROMPT STUDY OF MAGNETAR OUTBURSTS WITH CHANDRA
13500446	SN, SNR AND ISOLATED NS	Huang	Identification campaign of supernova remnant candidates in the Milky Way
13500457	SN, SNR AND ISOLATED NS	Wang	Guitar with a bow: a jet-like X-ray-emitting feature associated a fast-moving pulsar
13500459	SN, SNR AND ISOLATED NS	Pooley	Investigating the Emission of Extraordinarily Luminous and Unusual Supernovae
13500489	SN, SNR AND ISOLATED NS	Owen	IKT 16: A Composite SNR Discovered in the SMC?
13500494	SN, SNR AND ISOLATED NS	Ng	Hunting for Anti-magnetars with Chandra
13500514	SN, SNR AND ISOLATED NS	Patnaude	Multicycle Monitoring of the Young Galactic Supernova Remnant Cassiopeia A
13500556	SN, SNR AND ISOLATED NS	Racusin	Constraining the Energetics of Fermi-LAT GRBs with Chandra
13500575	SN, SNR AND ISOLATED NS	Acero	Exploring the fine morphology of the newly discovered nebula surrounding PSR J0855-4644
13500593	SN, SNR AND ISOLATED NS	Chandra	The X-ray Luminous Type IIn Supernova 2010jl
13500605	SN, SNR AND ISOLATED NS	Pavlov	Evolution of the Cas A CCO
13500615	SN, SNR AND ISOLATED NS	Sakamoto	Identification of the Host Galaxy of Swift Short GRBs by the Chandra Sub-arcsecond Position
13500634	SN, SNR AND ISOLATED NS	Pavlov	The puzzling outflow from the PSR B1259-63/SS 2883 binary
13500646	SN, SNR AND ISOLATED NS	Rea	Testing the magnetar model with the first low magnetic field soft gamma repeater
13500648	SN, SNR AND ISOLATED NS	Soderberg	The Energetics and Environments of Type Ibc Supernovae
13500674	SN, SNR AND ISOLATED NS	Kaspi	TINY HICCUPS TO TITANIC EXPLOSIONS: Tackling Transients in Anomalous X-ray Pulsars
13500695	SN, SNR AND ISOLATED NS	Pavan	CHANDRA OBSERVATIONS OF A PECULIAR NEWLY DISCOVERED DOUBLE-HEAD BOW-SHOCK PULSAR WIND NEBULA
13500696	SN, SNR AND ISOLATED NS	Patnaude	Monitoring the Late Time X-ray Emission from the Type IIL SN1979C
13500710	SN, SNR AND ISOLATED NS	Halpern	Investigating the Nature of the Unusual 59 ms Pulsar 'Calvera'
13500762	SN, SNR AND ISOLATED NS	Posselt	The pulsar wind nebula of PSR B1055-52
13500803	SN, SNR AND ISOLATED NS	Kargaltsev	Is HESS J1741-302 truly dark?
13500809	SN, SNR AND ISOLATED NS	Ray	X-ray and Radio emission from type IIP supernovae
13500890	SN, SNR AND ISOLATED NS	Saz Parkinson	Search for X-ray counterparts of Fermi LAT radio-quiet gamma-ray pulsars
13500898	SN, SNR AND ISOLATED NS	Fruchter	The Astrophysics of the Most Energetic Gamma-Ray Bursts
13500910	SN, SNR AND ISOLATED NS	Chiang	The X-Ray Evolution of Supernova 2004am
13500924	SN, SNR AND ISOLATED NS	De Luca	The proper motion of the nearby radio-quiet gamma-ray pulsar PSR J0357+3205
13500935	SN, SNR AND ISOLATED NS	Allen	A CASE OF MISTAKEN IDENTITY: DISRUPTED RECYCLED PULSARS OR ORPHANED ANTI-MAGNETARS?
13500943	SN, SNR AND ISOLATED NS	Yamaguchi	Spatial Structure of Overionized Plasma in Prototypical Mixed-Morphology Supernova Remnant G359.1-0.5

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500026

Title: Snap-shot survey of new galactic gamma-ray sources

PI Name: Gordon Garmire

In this exploratory program we will observe new gamma-ray pulsars and pulsar candidates. In addition to pulsars, we expect to resolve pulsar-wind nebulae and look for emission from SNRs around these young pulsars. Together with the gamma-ray data our observations will test models for multiwavelength emission from pulsars and pulsar-wind nebulae.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
13:11:45.40	-34:30:28.80	1FGL J1311.7-3429	ACIS-I	NONE	10
22:38:11.30	+58:59:53.20	PSR J2238+59	ACIS-I	NONE	10
16:27:03.00	-49:12:32.70	HESS J1626-490	ACIS-I	NONE	10
14:59:29.90	-60:53:16.00	PSR J1459-60	ACIS-I	NONE	10
02:48:18.60	+60:21:34.00	PSR J0248+6021	ACIS-I	NONE	10
17:31:17.60	-18:47:32.70	PSR J1731-1847	ACIS-I	NONE	10

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500027

Title: A timing and spectral imaging observation of the soft gamma-ray pulsar IGR J18490-0000

PI Name: Jelle Kaastra

We propose to observe the recently discovered soft gamma-ray pulsar IGR J18490-0000 for 25 ks with ACIS-S and for 25 ks with HRC-S in timing mode to perform both energy resolved imaging and spatially resolved timing of the near environment of the pulsar.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
18:49:01.60	-00:01:17.70	IGR J18490-0000	ACIS-S	NONE	25
18:49:01.60	-00:01:17.70	IGR J18490-0000	HRC-S	NONE	25

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500034

Title: Puppis A: the Micro-X Calorimeter Field of View 2012

PI Name: Claude Canizares

In January of 2012 the first astronomical use of a micro-calorimeter at the focus of a grazing-incidence telescope is scheduled to take place: a ~ 300 second observation of a region of Puppis A by the Micro-X rocket payload (http://space.mit.edu/micro-x/). This follow-up Chandra observation will be centered at the actual post-facto Micro-X field-of-view. The custom 15 ks ACIS-S3 observation will greatly aid in interpretation of the Micro-X data. The S3 is used to increase counts below 1 keV, e.g., at 0.6 keV ACIS-S3 has 4x the area of the ACIS-I FI devices. Note that this single unique-field observation is not expected to be in conflict with other more general Puppis A observing proposal(s), e.g., deep ACIS-I pointing(s).

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
08:22:48.00	-42:45:36.00	Puppis A - micro-X field	ACIS-S	NONE	15

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500072

Title: Chandra Cycle 13 Spatial and Spectral Monitoring of SNR 1987A

PI Name: David Burrows

Regular monitoring of SNR 1987A, the only supernova remnant in which we can study the early developmental stages in detail, is critical to testing models of SNR evolution, nonequilibrium ionization processes, and thin plasma spectra. SNR 1987A presents a unique opportunity to observe the birth and early evolution of a supernova remnant at high spatial and spectral resolution for the first time. We propose to continue our program of monitoring SNR1987A at roughly six month intervals in Cycle 13.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
05:35:28.00	-69:16:11.10	SNR 1987A	ACIS-S	HETG	75

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500078

Title: RXJ0720.4-3125: a precessing isolated neutron star?

PI Name: Peter Predehl

RX J0720.4-3125 belongs to a group of radio-quiet isolated neutron stars, whose spectra are characterized by a blackbody spectrum plus one or more broad absorption features. It is unique in that its blackbody temperature, and the depth of the absorption feature is variable. The cause for this spectral evolution is unclear, but one proposed model is free precession of a neutron star with two hot spots. However, the exact precession period, if it exists, is not well known, but must be of the order of 14 yr. Alternatively, an unknown cause may have heated the atmosphere or changed the magnetic field configuration. In that case one may expect that at some point the source changes back to the situation before 2003.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
07:20:25.00	-31:25:50.20	RXJ0720.4-3125	HRC-S	LETG	35

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500093

Title: Spatially-Resolved Spectroscopy of the IC443 Pulsar Wind Nebula and Environs

PI Name: Martin Weisskopf

We propose a 152 ksec observation of the Chandra-discovered Pulsar Wind Nebula in the supernova remnant IC443. This PWN is a rare transitional system where the overall morphology is affected by the interaction with the SNR shell, but the pulsar is still powerful enough to sustain an X-ray emitting nebula. We are proposing a spatially-resolved spectroscopic investigation of this transitional object to develop realistic models that would fill the gap between young Crab-like PWNe and much older plerions. The proposed research also addresses a number of other very specific objectives with regards to this system such as the surface temperature and proper motion of the neutron star, the properties of the termination shock in the pulsar wind, and interaction of the shocked wind with SNR matter.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
06:17:05.00	+22:21:27.00	IC443	ACIS-S	NONE	152

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: 13500127

Title: Measuring magnetar distance from the dust echo of a bright burst

PI Name: Andrea Tiengo

In 2009 we discovered, around the magnetar 1E 1547.0-5408, three bright X-ray expanding rings due to scattering of the radiation of a strong burst by three dust layers in our Galaxy. We propose rapid follow-up observations with Chandra in the case that a similar phenomenon is again detected in a magnetar. This would provide the first high resolution two-dimensional images of an X-ray expanding ring around an astrophysical object and constrain the source distance and energetics of the emission producing the dust echo. Moreover, the time evolution of the ring intensity and spectrum, depending on the dust grains composition and size, is a powerful tool to test the different interstellar dust models. This proposal was accepted in Cycle 12 but it has not been triggered yet.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
		Magnetar scattering halo	ACIS-I	NONE	70

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500159

Title: Unveiling the nature of cyclic behavior in the period evolution of the Anomalous X ray Pulsar XTE j1810-197

PI Name: Federico Bernardini

This program is aimed at obtaining a phase-coherent timing solution for the period evolution of XTEJ1810-197 (XTEJ), continuing the successful X-ray monitoring of this unique Anomalous X-ray Pulsar (AXP).AXPs are isolated neutron star (NS) whose emission is likely due to the decay of an extremely strong magnetic field, 10e+(14-15) G.The requested pointings are aimed at studying the period evolution of XTEJ, by means of phase connected timing analysis, with the goal of demonstrating the presence of a long term (5 yr) precession of its rotation axis. XTEJ could be a unique precessing Magnetar candidate (overall, only 3 precessing NSs are known).This could shed light on the physical properties of the NS crust/core core and, thus, on the physical properties of matter at extremely high density.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
18:09:51.10	-19:43:51.90	XTE J1810-197	ACIS-S	NONE	20
18:09:51.10	-19:43:51.90	XTE J1810-197	ACIS-S	NONE	20

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500163

Title: Expansion Measurements of the Southwestern Rim of RCW86

PI Name: Satoru Katsuda

We propose to perform a second-epoch observation of the southwestern rim of RCW86 in order to measure the proper motions of the forward shock. This remnant emits both thermal and nonthermal X-rays, and is delineated by nonradiative Balmer-dominated filaments. These properties make it an excellent laboratory for the study of particle acceleration. However, the distance to the remnant has not yet been precisely determined, with measurements scattered around either 1kpc or 3kpc. A combination of the proper motion and the actual shock velocity from optical spectroscopy will provide a stringent constraint on the distance for the first time. In addition, comparisons of proper motions at several locations will provide an opportunity to investigate the inhomogeneities of the ambient medium.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
14:40:46.30	-62:39:46.40	RCW86	ACIS-S	NONE	92

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500195

Title: Measuring the Spin-Down and Dipole Magnetic Field of the CCO Pulsar 1E 1207.4-5209

PI Name: Jules Halpern

We propose to make a definite measurement of the spin-down rate of the unique CCO pulsar 1E 1207.4-5209 by obtaining a phase-coherent timing solution, which is the only feasible way of measuring the P-dot of such a weakly magnetized NS. 1E 1207.4-5209 is the best isolated pulsar for which a direct comparison can be made of its global dipole magnetic field via spin-down, with the local B-field on the surface, as indicated by its cyclotron absorption spectrum. Existing data suggest that these independent measures agree to within a factor of 4, with the absence of a definite P-dot the limiting uncertainty. We can eliminate the error on P-dot and determine if the B-field measurements are identical for all practical purposes in 1E 1207.4-5209, the prototypical anti-magnetar.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
12:10:00.90	-52:26:28.40	1E1207.4-5209	ACIS-S	NONE	99
12:10:00.90	-52:26:28.40	1E1207.4-5209	ACIS-S	NONE	99

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500196

Title: The Energetic New Magnetar in HESS J1713-381/CTB 37B

PI Name: Jules Halpern

The spin-down power of the 3.82 s pulsar in the SNR CTB 37B is among the largest of magnetars, and it may be the youngest one as well. In addition, its spin-down rate increased by a factor of 2 last year. We propose to continue to monitor its spin-down. Magnetars with the largest spin-down power are SGRs, and a marked increase in their spin-down torque often precedes an outburst. In this regard, CXOU J171405.7-381031 is very similar to SGR/AXP 1E 1547.0-5408, the magnetar with the largest spin-down power. By analogy with 1E 1547.0-5408, we may be observing the behavior of a magnetar just before it becomes an SGR. Continued study of its spin-down will also enable us to evaluate whether CXOU J171405.7-381031 can contribute to the TeV emission from HESS J1713-381, in which it resides.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
17:14:05.70	-38:10:30.90	CXOU J171405.7-381031	ACIS-S	NONE	20

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500202

Title: Joint Chandra and HST Monitoring of the Crab Nebula

PI Name: Martin Weisskopf

In 2010 Sep the Crab surprised the astrophysical community with a powerful 4-day-long gamma-ray flare, detected by the Agile and Fermi satellites. Chandra and HST images taken post flare, were limited by the lack of a reference image taken before the flare. While the study of future flaring activity will be covered by a companion TOO proposal, here we propose a joint Chandra HST program. The scientific purpose of this proposal is to: 1) establish an X-ray and optical baseline of the system prior to any gamma-ray flare as an aid for establishing the location of the flare and, 2) to identify and quantify the spatial and spectral variations in X-rays and/or the optical over time.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
05:34:31.60	+22:00:56.40	Crab	ACIS-S	NONE	40

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500205

Title: Pre-Planned Target of Opportunity Observations of the Crab Nebula upon the Occurrence of the Next Gamma-Ray Flare

PI Name: Martin Weisskopf

The Crab Nebula (with its central pulsar) has been an ongoing source of stimulus to high-energy astrophysics over the past 50 years. The recent stunning discovery of rapidly variable ~1 GeV synchrotron photons demonstrate that the nebula structure differs from the description found in the majority of recent theoretical models. Locating these sources, our scientific goal, would be a giant step towards understanding them.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
05:34:31.60	+22:00:56.40	Crab	ACIS-S	NONE	50

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500310

Title: Chandra Observations of New X-ray Supernovae

PI Name: David Pooley

We propose to continue our X-ray studies of Type II and Type Ib/c supernovae (SNe). The Swift satellite has ushered in a new era of studying SNe in the X-rays, obtaining densely sampled X-ray lightcurves for the nearby core-collapse SNe. However, its spatial resolution is often not good enough to separate a SN from nearby sources. We propose short Chandra observations to alleviate this. These observations will assess the X-ray environment of newly discovered Swift SNe to determine any possible source confusion or contamination of the SN flux. Our strategy makes the best use of the capabilities of each observatory.

Target Name	Det.	Grating	Exp.Time
SN1	ACIS-S	NONE	10
SN2	ACIS-S	NONE	10
SN3	ACIS-S	NONE	10
SN4	ACIS-S	NONE	10

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500311

Title: Probing the Unique Morphology and Plasma Conditions of W49B with Chandra

PI Name: Laura Lopez

We propose a 220-ks Chandra ACIS-S3 observation of the galactic supernova remnant (SNR) W49B. W49B has several unique morphological and spectral features which are not found in other galactic SNRs: it is the only galactic SNR with large-scale segregation of its nucleosynthetic products, its X-ray spectrum is suggestive of rapid cooling uncommon in SNRs, and it is the only core-collapse SNR to date with detected He-like lines from the heavy elements chromium and manganese. The deep Chandra observation of W49B will facilitate X-ray morphological and spatially-resolved spectral analyses that will elucidate the physical conditions and nature of W49B, including explosion vs. environment effects, localization of over-ionized plasma, and constraints on the morphology and abundances of Cr and Mn.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
19:11:06.60	+09:05:60.00	W49B	ACIS-S	NONE	220

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: 13500433

Title: PROMPT STUDY OF MAGNETAR OUTBURSTS WITH CHANDRA

PI Name: Nanda Rea

The discovery of transient magnetars has opened a new perspective in the field confirming that a relatively large number of members of this class has not been discovered yet, and suggesting that others would manifest themselves in the future through outbursts. This proposal is aimed at gathering new insights on the physics of magnetars through the study of their outbursts. In particular, we are asking for 85ks of Chandra time divided in 4 observations throughout the outburst from a known or still unknown magnetar candidate.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
		NEWMAGNETAR	ACIS-S	NONE	85
18:09:51.10	-19:43:51.70	XTE J1810-197	ACIS-S	NONE	85
01:00:43.10	-72:11:34.00	CXOUJ0110-7211	ACIS-S	NONE	85
01:46:22.40	+61:45:03.30	4U0142+614	ACIS-S	NONE	85
10:50:07.10	-59:53:21.40	1E1048.1-5937	ACIS-S	NONE	85
18:41:19.40	-04:56:10.90	1E1841-04	ACIS-S	NONE	85
18:44:54.70	-02:56:53.40	AXJ1844-0256	ACIS-S	NONE	85
20:13:52.80	+34:19:55.20	SGR 2013+34	ACIS-S	NONE	85
23:01:08.30	+58:52:44.50	1E 2259+584	ACIS-S	NONE	85
16:35:51.80	-47:35:23.30	SGR 1627-41	ACIS-S	NONE	85
18:08:39.30	-20:24:39.50	SGR 1806-20	ACIS-S	NONE	85
05:26:00.90	-66:04:36.30	SGR 0526-66	ACIS-S	NONE	85
05:01:06.20	+45:16:35.00	SGR 0501+4516	ACIS-S	NONE	85
18:46:24.50	-02:58:28.00	PSR J1846-0258	ACIS-S	NONE	85
18:33:44.40	-08:31:07.70	SGR 1833-0832	ACIS-S	NONE	85
16:22:44.80	-49:50:54.40	PSR 1622-4950	ACIS-S	NONE	85
17:14:05.70	-38:10:30.90	CXO 171405-381031	ACIS-S	NONE	85
17:08:46.00	-40:08:53.00	RXSJ170849-400910	ACIS-S	NONE	85
19:07:14.30	+09:19:20.10	SGR 1900+14	ACIS-S	NONE	85
15:50:55.30	-54:19:02.00	1E 1547.0-5408	ACIS-S	NONE	85
04:18:33.90	+57:32:22.90	SGR 0418+4729	ACIS-S	NONE	85

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500446

Title: Identification campaign of supernova remnant candidates in the Milky Way

PI Name: Regina H. H. Huang

There are 274 supernova remnants (SNRs) that have been identified in the Milky Way. Most of these SNRs are discovered in radio surveys. In view of various selection effects, the current sample of SNRs is clearly incomplete. ROSAT all-sky survey data have provided another window to search for SNRs. We have reexamined this catalogue and chosen some bright and promising SNR candidates as the starting point of a long-term identification campaign. We propose a set of Chandra observations to have a full coverage of these targets in order to investigate their spectra and morphologies in details as well as to search for the associated compact stellar remnants produced in the supernova explosions.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
15:47:32.00	-37:55:09.00	G337.2+13	ACIS-I	NONE	25
19:07:05.00	+04:31:11.00	G38.7-1.4	ACIS-I	NONE	30

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500457

Title: Guitar with a bow: a jet-like X-ray-emitting feature associated a fast-moving pulsar

PI Name: Q. Daniel Wang

The Guitar Nebula is known to be a ram-pressure confined pulsar wind nebula associated with the very fast-moving pulsar B2224+65. Existing observations at two epochs have shown an unexpected 2 arcmin long X-ray-emitting jet-like feature emanating from the pulsar and offset from its proper motion direction by 118 degree. We propose a deep third epoch observation of this system in order to measure the X-ray spectral gradient across the feature as well as to confirm its proper motion, its morphological variation with time, and the presence of a counter jet. We will then critically test scenarios proposed to explain this system, which represents a class of similarly enigmatic objects recently discovered locally and in the central region of our Galaxy.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
22:25:51.90	+65:35:35.10	B2224+65	ACIS-S	NONE	100

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500459

Title: Investigating the Emission of Extraordinarily Luminous and Unusual Supernovae

PI Name: David Pooley

In the past few years, the Texas Supernova (SN) Search and its successor the ROTSE SN Verification Project (RSVP) have found several of the most luminous SNe ever detected. Explaining such high luminosities has been challenging, and, in each case, one must consider the "standard" interaction of the SN ejecta with the surrounding material as a (partial) source of this extraordinary luminosity before considering more exotic scenarios (e.g., pair-formation instability). Deep Chandra observations are a sensitive probes of interaction and are the only way to detect or set meaningful limits on the X-ray flux from such a SN given the typical distances involved. The continuation of RSVP as well as the new Palomar Transient Factory ensure a reliable stream of sources for future discovery.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
		Luminous SN	ACIS-S	NONE	100

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500489

Title: IKT 16: A Composite SNR Discovered in the SMC?

PI Name: Richard Owen

We propose a 40 ks Chandra ACIS-S observation of IKT 16, a SNR in the SMC which contains a candidate PWN. XMM-Newton observations strongly support the identification of this system as a composite SNR, but the spatial resolution of the EPIC cameras is insufficient to resolve its small-scale structure. Our proposed observation is essential to find the extent of this central source accurately and thus confirm its identity as the first composite SNR found in the SMC.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
00:58:16.70	-72:18:06.00	IKT 16	ACIS-S	NONE	40

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500494

Title: Hunting for Anti-magnetars with Chandra

PI Name: Chi-Yung Ng

Central compact objects (CCOs) are an enigmatic class of neutron stars whose X-ray emission mechanism remains a mystery. Recent spin-down measurements revealed the CCO PSR J1852+0040 as an anti-magnetar, a pulsar with a very weak surface magnetic field, which is hard to reconcile with the high surface temperature and large pulsed fraction observed. We propose new Chandra observations to complete our on-going census of all weak-field radio pulsars to search for more anti-magnetars. Any detection will confirm CCOs as a subset of radio pulsars, strongly constraining the physics of anti-magnetars.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
16:53:29.70	-43:15:01.00	PSR J1653-4315	ACIS-S	NONE	5
18:10:55.50	-18:20:39.00	PSR J1810-1820	ACIS-S	NONE	5
17:02:36.40	-42:17:01.20	PSR J1702-4217	ACIS-S	NONE	8
16:50:44.70	-43:41:30.80	PSR J1650-4341	ACIS-S	NONE	8

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500514

Title: Multicycle Monitoring of the Young Galactic Supernova Remnant Cassiopeia A

PI Name: Daniel Patnaude

Cas A is one of only a handful of young supernova remnants to exhibit variations in thermal and nonthermal emission on timescales of about a year, and is the only remnant to show direct evidence for an evolving, young central neutron star. Here we propose for four 50 ksec observations of Cas A spaced by approximately one year with the first near the beginning of Cycle 13, and the last near the end of Cycle 15, which are designed to probe the structure and composition of supernova ejecta by following its evolution as it is heated by the reverse shock, test theories of particle acceleration at supernova shocks, and monitor the surface temperature evolution of the neutron star to test theories of nuclear and condensed matter physics, and in particular superfluidity and superconductivity.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
23:23:26.70	+58:49:03.00	Cassiopeia A	ACIS-S	NONE	50

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500556

Title: Constraining the Energetics of Fermi-LAT GRBs with Chandra

PI Name: Judith Racusin

We propose to observe late-time X-ray afterglows of the most energetic subset of Fermi-LAT detected GRBs in order to constrain their jet break times, opening angles, and collimation corrected energy outputs. This new and exceptional population of GRBs demonstrate several new features not previously observed, and appear to be brighter on average than Swift era optical and X-ray afterglows, which makes them excellent candidates for broadband observations and detailed modeling. Observations of the X-ray afterglows by Swift-XRT do not reveal jet break signatures in these objects, suggesting that they occur later when the afterglows are too faint for XRT, but possibly still observable by Chandra.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
		GRB AO13-1	ACIS-S	NONE	60

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500575

Title: Exploring the fine morphology of the newly discovered nebula surrounding PSR J0855-4644

PI Name: Fabio Acero

PSR J0855-4644 is an energetic pulsar (Edot=1.1x10e36 erg/s) with a period of 65 ms discovered near the South-East rim of the SNR RX J0852.0-4622. The position of the pulsar is in spatial coincidence with an enhancement in X-rays and TeV gamma-rays, which could represent its pulsar wind nebula. We have revealed with recent XMM observation the X-ray counterpart of the pulsar together with an extended emission thus confirming the suggestion of a PWN. Interestingly, the core of the PWN (r<1 arcmin) exhibits some knots of X-ray emission separated by 180 suggesting a jet-like structure. The primary aim of this proposal is to study the small scale structures of the core of the nebula in order to confirm the presence of jets in the nebula and to search for a torus surrounding the pulsar.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
08:55:36.40	-46:44:14.60	PSR J0855-4644	ACIS-S	NONE	40

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500593

Title: The X-ray Luminous Type IIn Supernova 2010jl

PI Name: Poonam Chandra

Supernova SN 2010jl is a very bright Type IIn supernova shown to have X-ray emission early on. Our {\it Chandra} ACIS-S observations taken a month after the supernova discovery show a high temperature and large absorption column density indicating the forward shock origin of the X-rays where the absorption column is associated with the mass loss near the forward shock wave. This is the first time an external circumstellar X-ray absorption has been clearly observed in a supernova. This gives us a rare opportunity to follow the evolution of the external column density which gives unique information on the circumstellar structure and the shock interaction. In this proposal we request for 80 ks of {\it Chandra} ACIS-S time to carry out observations of SN 2010jl at two epochs.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
09:42:53.30	+09:29:41.80	SN 2010jl	ACIS-S	NONE	80

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500605

Title: Evolution of the Cas A CCO

PI Name: George Pavlov

The 330 yr old central compact object (CCO) in the Cas A SNR is likely a neutron star (NS) which does not show the usual pulsar activity and has a thermal-like spectrum. Ten years of Chandra observations have provided some evidence of gradual decline of the CCO's surface temperature. If true, this result is very important as it tightly constrains the properties of the superdense matter in the NS interiors. However, the data sets that show the temperature decline suffer from serious systematic uncertainties. We propose to repeat the only "clean" observation of the Cas A CCO, which will allow us to measure the temperature change in 6 years, undistorted by systematic errors, and unambiguously verify the claimed temperature decline.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
23:23:27.90	+58:48:42.60	Cas A CCO	ACIS-S	NONE	72

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500615

Title: Identification of the Host Galaxy of Swift Short GRBs by the Chandra Sub-arcsecond Position

PI Name: Takanori Sakamoto

We propose a ToO program to observe short GRBs detected by Swift to identify the afterglow in X-rays by a sub-arcsecond position from Chandra. Our ToO program will increase the number of short GRBs having an unambiguous host galaxy identification, and also should provide a much less biased sample host galaxies of short GRBs. We request a maximum of 6 ToOs for 20 ksec each based on the estimation of previous Swift short GRB observations. Our trigger criteria are 1) Swift short GRBs localized by Swift/XRT and 2) no afterglow confirmation in optical within 5 hours after the burst. We request <1-3 days response to our ToO, so that the afterglow can be observed while still bright.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
		SHORT GRB TOO	ACIS-S	NONE	20

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500634

Title: The puzzling outflow from the PSR B1259-63/SS 2883 binary

PI Name: George Pavlov

PSR B1259-63 is a middle-aged radio pulsar in an eccentric binary (e=0.87, P= 3.4 yr) with a high-mass Be companion. We observed this system near apastron in Chandra Cycle 10 and discovered extended emission, which apparently consists of elongated and compact components, tentatively interpreted as a pulsar jet and a bent tail of the pulsar wind nebula blown out of the binary by the wind of the massive component. To test the models of pulsar wind nebulae and study the colliding winds in high-mass binary systems, we propose two Chandra ACIS observations to examine the expected variation of the extended emission with the binary phase.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
13:02:47.60	-63:50:08.70	PSR B1259-63	ACIS-I	NONE	124

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500646

Title: Testing the magnetar model with the first low magnetic field soft gamma repeater

PI Name: Nanda Rea

Soft gamma repeaters (SGRs) are part of a small group of bursting neutron stars, probably powered by extreme B fields, aka magnetars. We have recently discovered an SGR with a low-B field (Rea et al. 2010, Science, 330, 944), SGR 0418+5729. X-ray observations show that its dipolar B cannot be greater than 7.2x10^{12}G, well in the range of ordinary radio pulsars. This discovery has large implications not only for the magnetar model, but for the pulsars population in general. We have been already awarded of a monitoring program through the joint XMM/Chandra call, however the source had showed an unexpected drop in flux which is forcing us to ask for more exposure time to reach our scientific aim: have a final measure or a deeper upper limit on SGR 0418+5729's dipolar magnetic field.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
04:18:33.90	+57:32:22.90	SGR 0418+5729	ACIS-S	NONE	90

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500648

Title: The Energetics and Environments of Type Ibc Supernovae

PI Name: Alicia Soderberg

Twenty-five years have passed since the peculiar class of Type Ibc supernovae were first recognized as a distinct flavor of core-collapse explosions. However, it is only recently that SNe Ibc have enjoyed a surge of interest thanks to their association with GRBs. Today, the most crucial question is whether SNe Ibc and GRBs arise from similar or distinct progenitor systems. Progress requires a detailed study of ordinary SNe Ibc which out-number GRBs by a factor of 100. Here we propose to continue our successful Chandra ToO program for SNe Ibc that is complemented by Swift/XRT and EVLA observations from our on-going programs.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
		SN Ibc2	ACIS-S	NONE	10
		SN Ibc1	ACIS-S	NONE	10

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500674

Title: TINY HICCUPS TO TITANIC EXPLOSIONS: Tackling Transients in Anomalous X-ray Pulsars

PI Name: Victoria Kaspi

The past decade has seen major progress in neutron star astrophysics, with the discovery of magnetars in general, and the recognition that the Anomalous X-ray Pulsars (AXPs) fall in this class. AXPs have recently revealed surprising and dramatic variability behavior, which theorists have begun to show are highly constraining of physical models of magnetars, including their crusts, atmospheres, coronae and magnetospheres. In this proposal, we request Chandra/ACIS-S Target-of-Opportunity observations of one major Anomalous X-ray Pulsar (AXP) outburst in AO13, in order to study in detail the evolution of the spectrum, pulsed fraction and pulse profile, for quantitative confrontation with recently developed models for the structure and electrodynamics of magnetars.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
10:50:08.90	-59:53:20.40	1E 1048.1-5937	ACIS-S	NONE	75
17:08:47.20	-40:08:50.70	RXS J1708-4009	ACIS-S	NONE	75
01:46:22.30	+61:45:07.00	4U 0142+61	ACIS-S	NONE	75
18:41:19.20	-04:56:12.50	1E 1841-045	ACIS-S	NONE	75
18:44:53.00	-02:56:40.00	AX J1845-0258	ACIS-S	NONE	75
01:00:43.10	-72:11:33.80	CXOU J0110043.1-721134	ACIS-S	NONE	75
16:47:10.20	-45:52:17.00	CXOU J164710.2-455216	ACIS-S	NONE	75
18:46:24.50	-02:58:28.00	PSR J1846-0258	ACIS-S	NONE	75
15:50:55.30	-54:19:02.00	1E 1547.0-5408	ACIS-S	NONE	75
17:14:05.70	-38:10:30.90	CXOU J171405.7-381031	ACIS-S	NONE	75
16:22:44.80	-49:50:54.40	PSR J1622-4950	ACIS-S	NONE	75
23:01:07.90	+58:52:46.00	1E 2259+586	ACIS-S	NONE	75
18:09:51.10	-19:43:51.70	XTE J1810-197	ACIS-S	NONE	75

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500695

Title: CHANDRA OBSERVATIONS OF A PECULIAR NEWLY DISCOVERED DOUBLE-HEAD BOW-SHOCK PULSAR WIND NEBULA

PI Name: Lucia Pavan

We discovered in archival X-ray data a cometary-like source near SNR MSH 11-61A. The source is characterized by a double-head connected with an elongated tail, suggesting it is a new member of bow-shock pulsar wind nebulae. This interpretation is also supported by the likely association with the still unidentified INTEGRAL source, IGR J11014-6103. We ask a 50 ks observation of the source exploiting the unique angular resolution and low background of the ACIS telescope on-board Chandra to: i) study in-depth for the first time the morphology and spectral properties of the tail,ii) disentangle the X-ray emission of the two head sources to unveil their nature, and iii) cover entirely the INTEGRAL error circle around IGRJ11014-6103 to firmly establish the association between the two sources.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
11:01:47.20	-61:01:24.20	2XMMi J110147.1-610124	ACIS-I	NONE	50

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500696

Title: Monitoring the Late Time X-ray Emission from the Type IIL SN1979C

PI Name: Daniel Patnaude

Models for the evolution of supernovae that expand into stellar winds predict that the X-ray emission will drop with time. However, since it was first recovered with ROSAT, the X-ray emission from SN 1979C in M100 has remained remarkably constant. Here we propose for two new observations of SN 1979C each of 80 ks in duration, with the first in Cycle 13 and the followup in Cycle 15. With these longer observations, we will not only monitor the steady emission, but we will also be able to characterize the spectrum in order to compare it the various models which have been proposed to describe the near constant X-ray emission.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
12:22:58.60	+15:47:51.70	SN 1979C	ACIS-S	NONE	80

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500710

Title: Investigating the Nature of the Unusual 59 ms Pulsar 'Calvera'

PI Name: Jules Halpern

Originally selected as an isolated neutron star candidate in the ROSAT All-Sky Survey, "Calvera" was recently discovered to be a 59 ms pulsar. But a claimed detection of the same 59 ms period in 20 months of Fermi data requires no period derivative, severely restricting the dipole magnetic field, distance, and spin-down luminosity to small values. If true, this would be important, as the X-ray temperature indicates that Calvera is younger than its spin-down age. It could be the first "orphan CCO", or a mildly recycled pulsar. However, the Fermi detection is almost certainly spurious, leaving the spin-down rate poorly constrained. We propose to measure it using X-ray timing, a robust method that will address the nature of this unique neutron star.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
14:12:55.80	+79:22:03.70	1RXS J141256.0+792204	ACIS-S	NONE	40

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500762

Title: The pulsar wind nebula of PSR B1055-52

PI Name: Bettina Posselt

Pulsar wind nebulae (PWNe) are common around young, energetic pulsars. Little is known, however, about the properties of PWNe around older pulsars because of their faintness. The 0.5 Myr old gamma-ray pulsar PSR B1055-52 is one of the few, nearby (<1kpc) middle-aged pulsars, for which detection and study of the PWN in X-rays are feasible but have not been carried out yet. The pulsar has energetics, age, X-ray spectrum and distance similar to those of Geminga and PSR B0656+14, for both of which PWNe have been found. In the case of PSR B1055-52, we expect a compact, faint bow-shock PWN which can only be resolved by Chandra. We propose a deep ACIS-I imaging observation of B1055-52 to constrain the properties of the relativistic pulsar wind and its interaction with the ambient medium.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
10:57:59.00	-52:26:57.20	PSR B1055-52	ACIS-I	NONE	60

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500803

Title: Is HESS J1741-302 truly dark?

PI Name: Oleg Kargaltsev

As the number of Galactic TeV sources approaches 100, there appear to be cases where the origin of the TeV emission is difficult to explain. Most of the firmly classified sources are pulsar-wind nebulae, SNRs and HMXBs, but there remain quite a few with uncertain identifications and several with no plausible counterparts at all. Recent Suzaku observations have found two X-ray sources which may be related to the double TeV source HESS J1740-302A/B. One possible counterpart might be a pulsar accompanied by a PWN, but the nature of the other X-ray source is unclear. To understand the nature of these X-ray sources and their connection to the TeV source, we propose two high-resolution observations with Chandra ACIS.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
17:41:26.00	-30:06:46.00	HESS J1741-302A	ACIS-I	NONE	45

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500809

Title: X-ray and Radio emission from type IIP supernovae

PI Name: Alak Ray

Type-IIP supernovae are common core collapse SNe but few have been detected in X-ray and radio. These radiation can be due to relativistic electrons and the high seed photon density of optical, UV and IR bands during the visual lightcurve plateau phase can affect the radio and X-ray emission. Supernova shocks can also produce thermal X-rays. Each process has unique signatures on radio/X-ray light curves and spectra. They can characterize the progenitors and the partial loss of their envelopes prior to the explosion, shedding light on the `red supergiant problem', the lack of more massive progenitors of observed type IIP SNe than 17 Msun that may end up in black holes. Requested observations and followup may constrain the properties of the radiating plasma in magnetic fields.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
		SN ToO-1	ACIS-S	NONE	40

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500890

Title: Search for X-ray counterparts of Fermi LAT radio-quiet gamma-ray pulsars

PI Name: Pablo Saz Parkinson

The discovery by Fermi LAT of a large population of radio-quiet gamma-ray pulsars has profound implications for our understanding of the pulsar emission mechanism as well as for arriving at a more complete census of Galactic neutron stars. Because these pulsars are undetectable in radio, many of their properties are uncertain, including the distance. X-ray observations provide a crucial window to characterize these objects. We propose a set of exploratory observations of all remaining radio-quiet gamma-ray pulsars with no significant coverage, with the goal of identifying the X-ray counterpart of such pulsars, a necessary first step in any subsequent X-ray study of such objects.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
07:34:45.70	-15:59:18.10	PSR J0734-1559	ACIS-S	NONE	15
18:46:26.00	+09:19:46.00	PSR J1846+0919	ACIS-S	NONE	15

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500898

Title: The Astrophysics of the Most Energetic Gamma-Ray Bursts

PI Name: Andrew Fruchter

The Large Area Telescope (LAT) of Fermi has found a sample of highly relativistic gamma-ray bursts (GRBs), which may be among the most energetic bursts ever discovered. Here we propose to use Chandra and HST to follow the late time X-ray and optical light curves of a LAT detected burst that also has excellent early multiwavelength coverage. Our observations, in conjunction with the Fermi data, will allow us to measure the energy and the bulk Lorentz factor of the explosion. Recent work on some of the most powerful GRBs begins to substantially constrain physical models of the progenitors. The energetics of the highly relativistic LAT bursts may greatly strengthen these constraints and provide new insight into the currently unknown mechanism that determines the energy in a GRB.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
		LAT Burst 1	ACIS-S	NONE	120

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500910

Title: The X-Ray Evolution of Supernova 2004am

PI Name: Yi-Kuan Chiang

Using archival and our proposed Chandra observations of M82, we found a candidate of an X-ray supernova, SN 2004am, that shows rising X-ray flux for several years after explosion. With new data taken after 2009, we found that the X-ray flux is decreasing. The peculiar long-term X-ray light curve after SN 2004am explosion and the pre-explosion X-ray emission link the supernova event to an accretion-powered binary system. We here propose follow up Chandra observations to monitor the decrease of the X-ray evolution of SN 2004am and investigate the nature of the X-ray source.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
09:55:46.60	+69:40:38.10	SN2004am	ACIS-S	NONE	20

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500924

Title: The proper motion of the nearby radio-quiet gamma-ray pulsar PSR J0357+3205

PI Name: Andrea De Luca

PSR\, J0357+32 is a radio-quiet $\gamma$-ray pulsar detected by the {\em Fermi}-LAT. The relatively high $\gamma$-ray flux with respect to the modest rotational energy loss rate suggests that PSR\, J0357+32 is relatively close-by, probably at $\approx$ 500 pc. An observation of PSR J0357+32 with Chandra in AO11 allowed us to detect the X-ray counterpart of the pulsar. Most interesting, Chandra data unveiled the existence of a huge (9 arcmin long) extended feature apparently protruding from the pulsar. The most natural interpretation of the feature - a bow-shock pulsar wind nebula - is challenged by its very unusual phenomenology and by energetic arguments.A measure of the pulsar proper motion with Chandra could easily clarify the nature of its puzzling X-ray tail.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
03:57:52.30	+32:05:20.60	PSR J0357+3205	ACIS-S	NONE	60

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500935

Title: A CASE OF MISTAKEN IDENTITY: DISRUPTED RECYCLED PULSARS OR ORPHANED ANTI-MAGNETARS?

PI Name: Bruce Allen

We recently discovered PSR J2007+2722 (Knispel et al., 2010), an isolated radio pulsar whose slow spin-down implies a low surface dipole magnetic field <2.1 10^10 G. It is thought to belong to an exotic class of a dozen objects known as Disrupted Recycled Pulsars (DRPs), lying on the same evolutionary path as Double Neutron Stars. However, recent work on young pulsars with anomalously low magnetic fields (anti-magnetars) suggests that similar DRPs might actually be misidentified anti-magnetars. We propose to test this idea by looking for X-ray emission from the most promising DRPs. Detection of even a few X-ray photons would establish that they are not old recycled pulsars, but are part of a potentially large population of previously unrecognized younger anti-magnetars.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
13:20:12.70	-35:12:26.00	PSR J1320-3512	ACIS-S	NONE	3.5
13:39:56.60	-47:12:05.50	PSR J1339-4712	ACIS-S	NONE	3.5
13:33:44.80	-44:49:26.20	PSR J1333-4449	ACIS-S	NONE	3.5
10:38:26.90	+00:32:43.60	PSR J1038+0032	ACIS-S	NONE	3.5
16:11:51.30	-58:47:42.30	PSR J1611-5847	ACIS-S	NONE	3.5
18:16:36.50	-56:43:42.10	PSR J1816-5643	ACIS-S	NONE	3.5
15:48:23.30	-48:21:49.70	PSR J1548-4821	ACIS-S	NONE	3.5
22:35:43.70	+15:06:49.10	PSR J2235+1506	ACIS-S	NONE	3.5
17:53:35.20	-19:14:58.00	PSR J1753-1914	ACIS-S	NONE	3.5
13:55:21.30	-62:06:20.10	PSR J1355-6206	ACIS-S	NONE	3.5

Subject Category: SN, SNR AND ISOLATED NS

Proposal Number: 13500943

Title: Spatial Structure of Overionized Plasma in Prototypical Mixed-Morphology Supernova Remnant G359.1-0.5

PI Name: Hiroya Yamaguchi

Recent X-ray observations have discovered overionized plasmas in several supernova remnants (SNRs). Since SNRs normally have underionized plasmas, this new result is dramatically changing our understanding of the dynamics and evolution of SNRs. The SNRs dominated by overionized plasmas seem to be correlated with the mixed-morphology (MM) class, suggesting that the plasma conditions are related to the other unusual properties of these SNRs. To reveal the formation processes of their morphology and overionization, we propose a high-resolution ACIS-I observation of the prototypical MM-SNR G359.1-0.5 with a 100 ks exposure. Our immediate objectives are to investigate the spatial distribution of the overionized plasma and to search for a central compact remnant associated with this SNR.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
17:45:22.00	-29:57:14.00	G359.1-0.5	ACIS-I	NONE	100

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 © 1998-2024. All rights reserved.