Accepted Cycle 13 Observing Proposals

CLUSTERS OF GALAXIES

Proposal Number	Subject Category	PI Name	Title
13800006	CLUSTERS OF GALAXIES	Murray	XMM-XXL Follow-up
13800010	CLUSTERS OF GALAXIES	Murray	Characterizing the Most Massive Clusters in the Local Universe
13800025	CLUSTERS OF GALAXIES	Garmire	Assembling a Large Sample of Fossil Groups
13800037	CLUSTERS OF GALAXIES	Murray	Measureing the properties of high redshift clusters
13800042	CLUSTERS OF GALAXIES	Murray	The outskirts of Abell 133
13800049	CLUSTERS OF GALAXIES	Murray	4C73.18: Catching a black hole as it transitions from very bright to very dim
13800057	CLUSTERS OF GALAXIES	Murray	Chandra extended cluster cosmology sample
13800069	CLUSTERS OF GALAXIES	Murray	Chandra Observations of a Sample of High Redshift SZE Galaxy Clusters
13800084	CLUSTERS OF GALAXIES	Predehl	Exploring the Physical Limits of Deep Galaxy cluster Surveys in X-rays - The case of XMMU J1532.2-0837 at z=1.36
13800085	CLUSTERS OF GALAXIES	Predehl	Astrophysical study with a merging cluster at an intermediate redshift
13800123	CLUSTERS OF GALAXIES	Mulchaey	The Impact of Brightest Cluster Galaxy Formation on the Intracluster Medium
13800223	CLUSTERS OF GALAXIES	Kraft	Particle Acceleration at a Strong Shock - A Deep Chandra Observation of NGC 4552
13800242	CLUSTERS OF GALAXIES	Maughan	The X-ray Scaling Relations of Low-Mass Galaxy Clusters
13800321	CLUSTERS OF GALAXIES	Allen	A Chandra Study of the Large-Scale Shock Front in Abell 2219
13800358	CLUSTERS OF GALAXIES	Simionescu	Imaging gas clumping in the outskirts of nearby clusters of galaxies
13800359	CLUSTERS OF GALAXIES	Sanders	Examining incredible structure in the core of the Coma cluster
13800423	CLUSTERS OF GALAXIES	David	The Merging Double Cluster Abell 1758
13800424	CLUSTERS OF GALAXIES	De Grandi	Abell 545 an uncommon merging cluster with radio halo and candidate shock
13800432	CLUSTERS OF GALAXIES	Jones	RXJ1347: Still the most X-ray luminous cluster in the Universe, but no longer so relaxed
13800464	CLUSTERS OF GALAXIES	Ponman	GAMA groups and cosmic feedback
13800509	CLUSTERS OF GALAXIES	Vikhlinin	CHANDRA EXPLORATION OF THE COSMIC MELTING POT IN THE VIRIALIZATION REGION OF A RICH GALAXY CLUSTER
13800542	CLUSTERS OF GALAXIES	Hlavacek-Larrondo	RXJ1532.9+3021: a cool core cluster of galaxies with an extreme Brightest Cluster Galaxy
13800562	CLUSTERS OF GALAXIES	Wegner	Dark and Luminous Matter in the Twin Clusters of Abell 2465
13800566	CLUSTERS OF GALAXIES	Cassano	Understanding the connection between radio halos and cluster mergers
13800569	CLUSTERS OF GALAXIES	Miller	To The Outer Limits of Clusters with Chandra and Suzaku
13800581	CLUSTERS OF GALAXIES	Forman	Abell 115: It Takes Two to Tango - The interaction of Relativistic and Thermal Plasma in a Merging Subcluster
13800663	CLUSTERS OF GALAXIES	Mazzotta	A DETAILED CHANDRA/HST STUDY OF THE FIRST z approx 1 CLUSTER BLINDLY DISCOVERED IN THE PLANCK ALL SKY SURVEY
13800690	CLUSTERS OF GALAXIES	Ogrean	Diffusive Shock Acceleration in a Double Radio Relic Cluster
13800738	CLUSTERS OF GALAXIES	EDGE	The most overlooked strong cool core cluster - RXCJ1350.3+0940
13800764	CLUSTERS OF GALAXIES	Hughes	Chandra Observations of the Brightest Sunyaev-Zeldovich Effect Cluster
13800811	CLUSTERS OF GALAXIES	Markevitch	DIGGING FOR FOSSILS OF A DISRUPTED COOLING FLOW IN ABELL 401
13800830	CLUSTERS OF GALAXIES	Hicks	Expanding the Frontiers with Chandra: Observations of the Most Massive z>0.6 Cluster of Galaxies Known
13800855	CLUSTERS OF GALAXIES	Humphrey	No Need for Gas Clumping at the Virial Radius in a Galaxy Group/Cluster?
13800883	CLUSTERS OF GALAXIES	Benson	Cosmology and Cluster Evolution from the 80 Most Massive Clusters in 2000 deg^2 from the South Pole Telescope Survey
13800889	CLUSTERS OF GALAXIES	Sun	One of the most powerful AGN outbursts in an enigmatic cluster ?
13800933	CLUSTERS OF GALAXIES	Garmire	Chandra Observation of the Most Massive Galaxy Clusters Detected in the South Pole Telescope Survey
13800948	CLUSTERS OF GALAXIES	Murray	RXJ1347-1145: the most luminous cluster in the Universe
13800951	CLUSTERS OF GALAXIES	Garmire	Completing X-ray Observations of the 20 Most Massive Clusters from the South Pole Telescope 2500 Square-Degree Survey

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800006

Title: XMM-XXL Follow-up

PI Name: Stephen Murray

XMM-XXL survey will cover 20 square degrees in two selected areas. Chandra follow-up observations of selected clusters identified with XMM will help to separate AGN emission from the cluster emission to improve estimates of cluster properties, especially the temperature and mass.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
02:20:05.80	-05:08:27.60	XXL1762	ACIS-I	NONE	150

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800010

Title: Characterizing the Most Massive Clusters in the Local Universe

PI Name: Stephen Murray

The Planck ESZ sample of clusters of galaxies is arguably the most complete sample of the most massive clusters in the low redshift (z<0.5) Universe. We propose observations of the 81 Planck clusters with S/N > 6, which have not been adequately observed with Chandra. For 54 of these, only X-ray observations from the ROSAT All Sky Survey (RASS) are available. The high angular resolution images will measure the cluster morphology, allowing the identification of merging systems and cool core clusters. From these observations, we will obtain hydrostatic masses for relaxed clusters, as well as mass proxies, including gas mass, gas temperature and Y_x. These will be used to produce the most accurate cluster mass function in the low redshift Universe for massive clusters.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
03:59:45.70	+00:06:13.00	G189.84-37.24	ACIS-I	NONE	4
10:26:02.00	+12:47:46.70	G228.49+53.12	ACIS-I	NONE	9
10:58:25.40	+56:46:49.40	G149.24+54.18	ACIS-I	NONE	9
16:31:28.80	-75:07:43.30	G315.70-18.04	ACIS-I	NONE	9
21:22:22.50	+23:12:11.50	G072.80-18.72	ACIS-I	NONE	9
03:52:31.00	-74:00:18.40	G288.61-37.65	ACIS-I	NONE	9
18:25:08.00	+30:26:03.10	G058.28+18.59	ACIS-I	NONE	9
08:41:55.10	-17:29:58.60	G241.97+14.85	ACIS-I	NONE	10
12:59:21.60	+60:05:22.90	G121.11+57.01	ACIS-I	NONE	14
22:26:29.90	+78:19:28.60	G115.71+17.52	ACIS-I	NONE	14

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800025

Title: Assembling a Large Sample of Fossil Groups

PI Name: Gordon Garmire

We propose GTO observations of 5 fossil group (FG) candidates. These targets have been identified from the maxBCG optical cluster survey by selecting groups with extremely luminous and dominant brightest cluster galaxies (BCGs). These observations will confirm the presence of a cluster-scale gravitational potential and provide an estimate of the ICM temperature; when combined with our previous sample of 11 FGs from Cycle 10 and 4 proposed in GO this round, they will represent the largest X-ray sample of bona-fide fossil groups. Follow-up ground-based spectroscopy and deep X-ray observations of the sample will allow comparison of scaling relations to those of normal groups and clusters, and help to unravel the origin of these puzzling systems.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
08:28:06.60	+26:54:42.60	SDSS J0828+2654	ACIS-S	NONE	10
11:20:57.40	+50:22:19.00	SDSS J1120+5022	ACIS-S	NONE	10
11:57:53.30	+67:38:01.30	SDSS J1157+6738	ACIS-S	NONE	15
12:27:09.80	+68:03:56.60	SDSS J1227+6803	ACIS-S	NONE	15
09:07:43.60	+10:56:50.50	SDSS J0907+1056	ACIS-S	NONE	20

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800037

Title: Measureing the properties of high redshift clusters

PI Name: Stephen Murray

This 40 ks observation of MS1006.0+1202 a moderate redshift (z=0.22), luminous (Lx=7 10e44 ergs/s) cluster will be used with the existing observation to better define its structure. Along with these data and a deeper proposed observation, we will determine if the present structure arises from a merger or an extremely energetic AGN outburst.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
10:08:47.50	+11:48:02.60	MS1006.0+1202	ACIS-I	NONE	40

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800042

Title: The outskirts of Abell 133

PI Name: Stephen Murray

We propose to study the distribution of baryons in the outskirts of Abell 133 by cross-correlating the Chandra X-ray image with the deep optical images obtained with Magellan/IMACs. We will search for the X-ray signature of the stellar material associated with the cluster galaxies, signs of enrichment on the cluster ICM by galaxies, and for condensation of the hot intracluster gas in the galaxies potential wells.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
01:02:25.50	-21:33:58.40	A133D	ACIS-I	NONE	50
01:04:02.10	-21:49:57.70	A133F	ACIS-I	NONE	50

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800049

Title: 4C73.18: Catching a black hole as it transitions from very bright to very dim

PI Name: Stephen Murray

This 20 ks observation of 4C73.18 will be used with the existing 9 ks observation and a deep potential observation to characterize the surrounding hot atmosphere and cavities. 4C73.18 may be near the end of its radiative "quasar" phase, but currently still near its Eddington luminosity, but surrounded by a hot gas atmosphere.We will determine the mechanical energy of the AGN outburst required to produce the X-ray cavities.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
19:27:48.50	+73:58:01.60	4C73.18	ACIS-S	NONE	20

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800057

Title: Chandra extended cluster cosmology sample

PI Name: Stephen Murray

This 50 ks observation of CHECCS000105-2503 is part of a distant cluster sample that will allow a systematic study of cluster structure and scaling relations at the highest accessible redshifts and will provide an increased redshift leverage for cosmological model contraints.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
00:01:05.40	-25:03:45.30	CHECCS000105-2503	ACIS-I	NONE	50

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800069

Title: Chandra Observations of a Sample of High Redshift SZE Galaxy Clusters

PI Name: Stephen Murray

We propose to obtain X-ray observations of a set of high redshift clusters selected from a complete sample of SZE selected galaxy clusters from the South Pole Telescope (SPT) survey. The SZE selection produces an approximately mass limited sample (at all redshifts) over the existing SPT survey.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
00:40:48.50	-44:07:52.30	SPT-CLJ0040-4407	ACIS-I	NONE	8
04:11:15.90	-48:19:05.20	SPT-CLJ0411-4819	ACIS-I	NONE	8
21:45:51.40	-56:44:49.60	SPT-CLJ2145-5644	ACIS-I	NONE	15
04:17:23.10	-47:48:40.70	SPT-CLJ0417-4748	ACIS-I	NONE	22

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800084

Title: Exploring the Physical Limits of Deep Galaxy cluster Surveys in X-rays - The case of XMMU J1532.2-0837 at z=1.36

PI Name: Peter Predehl

We propose to explore the physical limits of deep galaxy cluster surveys in X-rays based using XMMU J1532.2-0837 at z=1.36.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
15:32:13.20	-08:37:01.40	XMMU J1532.2-0837	ACIS-S	NONE	25

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800085

Title: Astrophysical study with a merging cluster at an intermediate redshift

PI Name: Peter Predehl

We propose a 7.5 ks CHANDRA snapshot observation of RXCJ1253.8-2622, which is a newly discovered X-ray cluster at an intermediate redshift (z=0.22) in the REFLEX2 catalogue. It is a potentially interesting merging cluster with a large spatial extent exhibiting an optically rich and complex morphological structure with the major galaxy concentration. Our goal with this proposal is to obtain a clear picture of the morphology of the cluster to reconstruct the merger configuration and the bulk temperature for a mass assessment.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
12:53:47.00	-26:24:30.00	RXC J1253.8-2622	ACIS-I	NONE	7.5

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800123

Title: The Impact of Brightest Cluster Galaxy Formation on the Intracluster Medium

PI Name: John Mulchaey

We propose Chandra and HST observations of a unique X-ray cluster in which the Brightest Cluster Galaxy (BCG) is in the late stages of formation. The Chandra observations will be used to study how the properties of the intracluster medium are impacted by BCG formation and the HST data will be used to map out the intracluster stellar light. We will test whether the formation of the BCG has destroyed the cool core and determine the role of intracluster stars in enriching the intracluster medium. The proposed observations will be combined with our existing Chandra and HST data for clusters where the BCG is in the early stages of formation, allowing us to develop a more complete evolutionary picture of how BCG formation has affected the intracluster medium.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
07:20:54.00	+71:08:58.00	RXJ0720.8+7109	ACIS-S	NONE	125

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800223

Title: Particle Acceleration at a Strong Shock - A Deep Chandra Observation of NGC 4552

PI Name: Ralph Kraft

We propose a 150 ks Chandra/ACIS-S observation of the nearby early-type galaxy NGC 4552. A previous 50 ks observation detected a strong shock (Mach 1.7) in the gas associated with a nuclear outflow. We re-examined these data and find a non-thermal component in the spectrum of the shocked gas. This component could be synchrotron emission from ultra-relativistic electrons generated at the shock. If confirmed, it would demonstrate that NGC 4552 is a transitionary object between Cen A, where the supersonic inflation of the lobes created a synchrotron shock, and the lower Mach number, purely thermal shocks seen in most radio galaxies. NGC 4552 is also falling into Virgo, and this observation will constrain subsonic gas motions induced in the cores of supersonic mergers.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
12:35:39.80	+12:33:23.00	NGC 4552	ACIS-S	NONE	150

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800242

Title: The X-ray Scaling Relations of Low-Mass Galaxy Clusters

PI Name: Ben Maughan

We request short (10 ks) observations of two nearby, low-mass clusters of galaxies in order to complete a flux limited sample of 24 low-mass clusters. The complete sample will be used to study the X-ray scaling relations of low-mass clusters to probe the non-gravitational processes which become important at low masses. This will be the largest statistically complete Chandra sample of low-mass clusters, and will permit crucial corrections for selection biases in the study of low mass scaling relations for the first time.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
08:10:24.20	+42:16:19.00	cl0810+4216	ACIS-I	NONE	10
15:01:18.30	-08:30:33.00	cl1501-0830	ACIS-I	NONE	10

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800321

Title: A Chandra Study of the Large-Scale Shock Front in Abell 2219

PI Name: Steven Allen

Abell 2219 (z=0.225) is the third galaxy cluster in which a clear, large-scale shock front, viewed approximately edge-on and generated by ongoing merging activity, has been discovered. It is highly X-ray luminous and 2.5 times brighter in X-rays than either 1E0657-56 or A520. We propose a 150ks ACIS-I observation to obtain the first precise measurements of the pre- and post-shock gas temperature, enabling improved estimates of the Mach number and shock velocity. The observed gradient of the temperature jump across the shock will constrain the process of post-shock electron-ion equilibration. We will probe the origin of very hot (kT>20 keV) gas observed in the cluster center. High quality radio, optical-dynamical, and ground- and space-based gravitational lensing data are in hand.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
16:40:20.00	+46:42:39.00	Abell 2219	ACIS-I	NONE	150

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800358

Title: Imaging gas clumping in the outskirts of nearby clusters of galaxies

PI Name: Aurora Simionescu

Using Suzaku data, we found that the apparent baryon fraction exceeds the cosmic mean beyond half of the virial radius of the Perseus Cluster, which comprises the first observational evidence that the gas in the cluster outskirts has a clumpy distribution. We have also found strong indications that the same process is at play in the outskirts of the Virgo Cluster. The gas clumps are denser, and thus much brighter, than the ambient intracluster gas. We propose a set of Chandra observations which will allow us to image these clumps for the first time in order to assess their shapes and determine their size and density distribution. This will provide important constraints for numerical models of ICM physics and for simulations of the formation and ongoing growth of galaxy clusters.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
03:17:14.70	+42:19:42.60	Perseus_NWclumping1	ACIS-I	NONE	37.5
03:17:14.70	+42:20:03.50	Perseus_NWclumping2	ACIS-I	NONE	37.5
03:17:16.90	+42:20:03.80	Perseus_NWclumping3	ACIS-I	NONE	37.5
03:17:17.00	+42:19:43.00	Perseus_NWclumping4	ACIS-I	NONE	37.5

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800359

Title: Examining incredible structure in the core of the Coma cluster

PI Name: Jeremy Sanders

We propose to make Chandra observations of the core of the Coma cluster that are an order of magnitude deeper than currently exist. With this substantial increase in detail we will study the quasi-linear structures that we have discovered from existing XMM data, which do not look like conventional hydrodynamical turbulence. The new observations will tell us much about the intracluster medium, including the degree of turbulence, the viscosity and the mixing of metals. We will look for shocks, sound waves and other features associated with the merger. We plan to also examine gas clumping and the coronae around the central galaxies. The Coma cluster is the best multiwavelength studied cluster and the 3rd X-ray brightest. This new observation will provide an excellent legacy resource.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
12:59:49.00	+27:57:48.00	Coma cluster	ACIS-I	NONE	125
12:59:49.00	+27:57:48.00	Coma cluster	ACIS-I	NONE	125
12:59:49.00	+27:57:48.00	Coma cluster	ACIS-I	NONE	125
12:59:49.00	+27:57:48.00	Coma cluster	ACIS-I	NONE	125

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800423

Title: The Merging Double Cluster Abell 1758

PI Name: Laurence David

A1758 comprises two X-ray luminous clusters (A1758N and A1758S), each of which is undergoing a major merger. The redshift of the Fe lines in the XMM-Newton spectra show that the velocity difference between A1758N and A1758S is approximately 2,000 km/s, indicating that these clusters likely form a gravitationally bound system. A1758N is undergoing a merger between two 7 keV clusters, while A1758S is in the early states of a merger between two 5 keV clusters. With our proposed 150 ksec ACIS observation we will search for merger shocks and cold fronts in both merging clusters. Through a combination of X-ray, lensing, NIR and optical data for A1758, we can develop a better understanding of the merger dynamics and the impact of the mergers on the properties of the host galaxies.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
13:32:37.50	+50:30:06.50	Abell 1758	ACIS-I	NONE	150

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800424

Title: Abell 545 an uncommon merging cluster with radio halo and candidate shock

PI Name: Sabrina De Grandi

We propose an observation of A545, a cluster whose radio, optical and X-ray data point to a system undergoing a major merger on the sky plane, with a candidate shock at ~400 kpc from the center. The unique discovery of an extended central stellar halo with no associated BCG is particularly intriguing as it suggests that this system may be undergoing a critical dynamic phase, rarely observed. The new XMM AO10 observation of A545 that we have obtained will suffer of the limited spatial resolution with respect the exquisite capabilities of Chandra. We plan to use a 30 ks Chandra exposure to constrain the surface brightness across the candidate shock and to produce thermodynamical maps of the center of A545 with regions on scales, which are unreachable with the XMM resolution.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
05:32:27.70	-11:30:49.60	ABELL 545	ACIS-S	NONE	30

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800432

Title: RXJ1347: Still the most X-ray luminous cluster in the Universe, but no longer so relaxed

PI Name: Christine Jones

We propose a deep Chandra ACIS observation of the distant (z=0.451) massive cluster RXJ1347.5-1145, the most luminous known cluster in the Universe. Our goals are to understand the gas sloshing phenomenon, in which a merging subcluster causes bulk motion of the gas in the core of the primary cluster. RXJ1347 is a prime example of this process and has the advantage of having the perturbing subcluster identified. Extensive multiwavelength observations of RXJ1347 range from high resolution SZ measurments to deep HST 14 filter images. These combined with simulations and deep Chandra data will allow us to measure the mass of the cluster components, the distribution of dark matter as well as hot gas, the timescale and nature of the merger, and how well mass proxies characterize the total mass.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
13:47:31.00	-11:45:13.00	RXJ 1347.5-1145	ACIS-I	NONE	125

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800464

Title: GAMA groups and cosmic feedback

PI Name: Trevor Ponman

The hot intergalactic gas within groups is highly sensitive to cosmic feedback. In principle, the dispersion in the entropy and other properties of this gas imposes strong constraints on feedback models. However, in practice no survey of the gas properties in an unbiased sample of group halos has yet been conducted, since X-ray selection imposes obvious biases, whilst existing optically selected samples are vulnerable to serious contamination by spurious groups. Using the much deeper reach of the GAMA spectroscopic survey, in conjunction with its mock catalogue, we have selected an `ultra-clean' sample of group halos, allowing a first study with Chandra of the distribution of hot gas properties, for comparison with cosmological feedback simulations.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
11:39:44.00	-01:01:46.40	G12-34	ACIS-I	NONE	15
09:19:16.40	+01:02:10.70	G09-72	ACIS-I	NONE	10
11:46:08.30	-01:07:09.90	G12-11	ACIS-I	NONE	16
12:18:49.70	-01:02:49.00	G12-18	ACIS-I	NONE	11
11:44:23.30	-01:51:04.60	G12-36	ACIS-I	NONE	25
12:09:01.90	-00:57:54.60	G12-14	ACIS-I	NONE	35
14:28:45.50	+00:42:29.20	G15-6	ACIS-I	NONE	52
11:44:50.50	-01:36:04.80	G12-63	ACIS-I	NONE	25
14:50:59.70	-00:02:15.00	G15-28	ACIS-I	NONE	27

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800509

Title: CHANDRA EXPLORATION OF THE COSMIC MELTING POT IN THE VIRIALIZATION REGION OF A RICH GALAXY CLUSTER

PI Name: Alexey Vikhlinin

The virialization zone of rich galaxy clusters, R500

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
01:01:59.80	-21:32:20.70	A133-1	ACIS-I	NONE	250
01:01:13.90	-22:02:30.80	A133-3	ACIS-I	NONE	250
01:03:04.80	-21:37:39.50	A133-4	ACIS-I	NONE	250
01:02:19.00	-22:07:50.70	A133-5	ACIS-I	NONE	250
01:04:09.80	-21:42:56.70	A133-6	ACIS-I	NONE	250
01:03:24.20	-22:13:09.00	A133-8	ACIS-I	NONE	250
01:01:36.90	-21:47:25.90	A133-2	ACIS-I	NONE	250
01:03:47.00	-21:58:02.90	A133-7	ACIS-I	NONE	250

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800542

Title: RXJ1532.9+3021: a cool core cluster of galaxies with an extreme Brightest Cluster Galaxy

PI Name: Julie Hlavacek-Larrondo

We propose to obtain deep Chandra observations of RXJ1532.9+3021 (90ks), a luminous cool core cluster of galaxies harbouring one of the most extreme Brightest Cluster Galaxies (BCG). The BCG is ultra luminous in the infrared; has one of the most massive molecular gas detections; and is particularly blue, suggesting strong star formation. This object is exceptional, and provides a unique opportunity for studying the heating and cooling balance in clusters. We also find evidence of two giant cavities, with some of the largest bubble heating powers known (but deeper X-ray data are needed for confirmation). By adding 90 ks to the data, we will increase the exposure by an order of magnitude, allowing us to study in detail the feedback processes that arise in this uniquely interesting cluster.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
15:32:53.80	+30:20:57.60	RXJ1532.9+3021	ACIS-S	NONE	90

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800562

Title: Dark and Luminous Matter in the Twin Clusters of Abell 2465

PI Name: Gary Wegner

Abell 2465 (z=0.245) is a binary cluster system with nearly equal mass components, confirmed by both optical and X-ray observations. This clean double geometry is optimal for modelling and examining the merger scenarios of galaxy clusters which are of cosmological interest. Spectroscopic and weak lensing analyses of Abell 2465 reveal that the cluster pair has unusual properties including enhanced star formation and a separation of its X-ray and luminous galaxy components from the dark matter. Such effects provide probes of dark matter and gravity. The proposed 70 ks Chandra observation will provide the depth and resolution to study these and other effects that the merger has had on the cluster gas.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
22:39:30.20	-05:44:21.00	Abell 2465	ACIS-I	NONE	70

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800566

Title: Understanding the connection between radio halos and cluster mergers

PI Name: Rossella Cassano

The GMRT Survey of Radio Halos (RH) allowed the first statistical measure of the occurrence of RH in galaxy clusters, showing that only 30 percent of X-ray luminous clusters host RH. We obtained a Chandra archival proposal (cycle 11) to study the dynamical status of clusters of the GMRT Survey and discover that RH form in merging clusters, while clusters without RH are statistically more relaxed. We propose to complete this study by observing the remaining 10 GMRT clusters without X-ray archival Chandra data. These observations will improve our statistics and allow us to determine the fraction of merging clusters without RH and to compare their dynamical properties with those of merging clusters with RH. This is crucial to unveil the conditions necessary to generate RH.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
05:10:44.70	-08:01:06.00	RXCJ0510.7-0801	ACIS-I	NONE	21
23:41:16.80	-09:01:39.00	Abell 2645	ACIS-I	NONE	27
13:11:31.50	+22:00:05.00	Z5768	ACIS-I	NONE	27
13:06:00.40	+26:30:58.00	Z5699	ACIS-I	NONE	30
15:12:12.60	-22:54:59.00	RXCJ1512.2-2254	ACIS-I	NONE	35
00:27:49.80	+26:16:26.00	RXJ0027.6+2616	ACIS-I	NONE	23

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800569

Title: To The Outer Limits of Clusters with Chandra and Suzaku

PI Name: Eric Miller

We propose ACIS-I snapshot observations of the outskirts of three galaxy clusters. When combined with awarded Suzaku observations of overlapping regions, these data will enable us to identify X-ray point sources (cluster and background AGN) that are undetectable by Suzaku and that dominate the uncertainty in the X-ray background. The combination of Chandra and Suzaku data is vital to our search for non-equilibrium structures in these seemingly relaxed systems. In addition, we will obtain a full census of bright cluster AGN out to r200, thereby improving constraints on evolution of the AGN fraction in these systems.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
09:17:53.30	+51:43:41.00	A773	ACIS-I	NONE	20
10:40:44.90	+39:57:08.50	A1068	ACIS-I	NONE	20
23:51:39.30	-26:05:02.70	A2667	ACIS-I	NONE	20

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800581

Title: Abell 115: It Takes Two to Tango - The interaction of Relativistic and Thermal Plasma in a Merging Subcluster

PI Name: William Forman

We propose a 310 ks ACIS-I observation of the merging cluster A115 whose northern subcluster, A115-N, hosts 3C28 which shows two wispy "tails" pointing in the direction of subcluster motion! With 360 ks (310 ks new, plus 50 ks archival), we can study the hydrodynamics of the gas flow in and around A115-N to determine flow velocities that are traced by the radio plasma. We will measure and compare the circulation time of the gas to the aging time of the radio emitting electrons, understand the structure of the relativistic plasma (i.e., thin sheath or filled cavity) by measuring distortions in the X-ray surface brightness, investigate magnetic draping, and develop a 3D model for the merger using extensive optical spectroscopy with the velocity of A115-N measured from the X-ray analysis.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
00:55:56.50	+26:22:10.00	Abell 115	ACIS-I	NONE	310

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800663

Title: A DETAILED CHANDRA/HST STUDY OF THE FIRST z approx 1 CLUSTER BLINDLY DISCOVERED IN THE PLANCK ALL SKY SURVEY

PI Name: Pasquale Mazzotta

PLCKG266.6-27.3 is the first Planck blindly discovered cluster of galaxies at z=1. Consistent with expectations for high z Planck-detected clusters, a 10ks XMM observation confirms that it is an exceptional system: with its L500=15 10^44 ergs^-1, T500=11.6\pm1.4keV, and M500=7.8\pm1.0 10^14 M it is the most luminous cluster known at z > 0.5 and one of the most (if not the most) massive cluster at redshift z>1. Furthermore, unlike other high redshift clusters, PLCKG266.6-27.3 is likely to be a relaxed system so potentially ideal to make accurate hydrostatic mass measurements. We propose a joint Chandra-HST observation of PLCKG266.6-27.3 to confirm the relaxed dynamical status and, for the first time, to compare weak lensing and hydrostatic measurements in a z=1 cluster.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
06:15:52.00	-57:46:51.60	PLCKG266.6-27.3	ACIS-I	NONE	245

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800690

Title: Diffusive Shock Acceleration in a Double Radio Relic Cluster

PI Name: Georgiana Ogrean

Galaxy cluster mergers result in shocks within the ICM. Because these shocks are collisionless, their interactions are mediated by electromagnetic fields, and it is possible for a fraction of the thermal distribution of particles to be accelerated and transformed into nonthermal populations of cosmic rays through diffusive shock acceleration (DSA). Current theories of DSA have difficulties in explaining the required efficiency of particle acceleration in merger shock waves. We aim to use Chandra to study the gas dynamics in the galaxy cluster CIZA J2242.8+5301, a disturbed cluster hosting a 2-Mpc long double radio relic. The small width and the smooth appearance of the northern relic makes CIZA J2242.8+5301 a unique textbook-case laboratory for shock acceleration at merger shock waves.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
22:42:48.10	+53:02:48.80	CIZA J2242.8+5301	ACIS-I	NONE	200

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800738

Title: The most overlooked strong cool core cluster - RXCJ1350.3+0940

PI Name: ALASTAIR EDGE

We request a Chandra observation of a remarkably strong cool core cluster which, through historical accident, has been completely neglected in the past 20 years. The radio, optical and sub-mm properties of the central cluster galaxy are comparable to many of the best studied cool core clusters (A1068, A1835 and Zw3146) but it is in fact the lowest redshift of all of these systems. A 20ks observation will allow us to make a direct comparison of the X-ray properties of the cluster to other strong cool cores and ensure that this system comes in from the cold.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
13:50:22.20	+09:40:10.80	RXCJ1350.3+0940	ACIS-S	NONE	20

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800764

Title: Chandra Observations of the Brightest Sunyaev-Zeldovich Effect Cluster

PI Name: John Hughes

We propose deep Chandra observations of ACT-CL J0102-4915, the brightest Sunyaev-Zeldovich effect cluster discovered by the Atacama Cosmology Telescope and South Pole Telescope surveys. These surveys covered approximately 3000 square degrees and are essentially complete to high redshift. Our recent Chandra and VLT optical data reveal ACL-CL J0102-4915 to be undergoing a major merger. It is likely a high redshift (z=0.870) counterpart to the famous ``bullet'' cluster. New Chandra data will determine the properties of the merger shock and the HST/ACS data will provide a weak lensing mass map.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
01:02:53.00	-49:15:16.90	ACT J0102-4915	ACIS-I	NONE	300

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800811

Title: DIGGING FOR FOSSILS OF A DISRUPTED COOLING FLOW IN ABELL 401

PI Name: Maxim Markevitch

The currently favored solution for the cluster cooling flow problem is AGN feedback. Indeed, most cool-core clusters have signs of present or past AGN activity, such as X-ray cavities and radio lobes. We recently proposed another mechanism to heat a cooling flow that involves merger-induced sloshing of the core gas. Sloshing is also observed in most cool cores. A401 is a very peculiar relaxed cluster with a prominent cD galaxy that, contrary to expectation, does not have a cool core, nor a central AGN or signs of past activity. It has a radio minihalo, which are associated with cool cores. A401 may have had its core disrupted by sloshing, possibly induced by a past encounter with A399. The proposed deep exposure should reveal fossils of its past cool core and clarify how it was disrupted.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
02:58:57.50	+13:34:41.00	A401	ACIS-I	NONE	140

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800830

Title: Expanding the Frontiers with Chandra: Observations of the Most Massive z>0.6 Cluster of Galaxies Known

PI Name: Amalia Hicks

The recent explosion of cluster discoveries at high-z has sparked a revolution in cluster science. But as we push higher in redshift, detailed cluster analysis becomes more challenging, and is feasible only for the most massive systems. We propose an in-depth X-ray study of the baryonic content in the cluster RCS2327−0204 (z=0.70). All existing data indicate that it is the most massive galaxy cluster known at z>0.6. With the proposed observation we will construct detailed maps of the ICM, to firmly establish the thermodynamic state of the cluster and search for interesting features such as shocks, fronts, and AGN feedback. These data will also allow us to determine the total mass profile and confirm the 3-D shape of the cluster core via a combination of data from multiple wavebands.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
23:27:27.60	-02:04:38.00	RCS2327.4-0204	ACIS-S	NONE	150

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800855

Title: No Need for Gas Clumping at the Virial Radius in a Galaxy Group/Cluster?

PI Name: Philip Humphrey

Through a combination of high-quality Chandra and Suzaku data we have recently obtained novel constraints on the hot gas and dark matter out to the virial radius Rvir in the fossil group/cluster RXJ 1159+5531. We measure the gas fraction and entropy at Rvir that are fully consistent with gravity-only structure formation simulations. Since beyond R500 we have only Suzaku data, where also the background dominates the source over most energies, we propose new offset Chandra ACIS-I observations to resolve discrete sources and provide a more accurate characterization of the cosmic background. If our previous results are verified, it would suggest that the type of gas clumping proposed to explain the gas behaviour in some clusters is not common to all systems.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
12:00:41.60	+55:39:55.10	RXJ1159+5531 Offset 1	ACIS-I	NONE	50
11:59:29.10	+55:42:13.70	RXJ1159+5531 Offset 2	ACIS-I	NONE	50

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800883

Title: Cosmology and Cluster Evolution from the 80 Most Massive Clusters in 2000 deg^2 from the South Pole Telescope Survey

PI Name: Bradford Benson

We propose Chandra X-ray observations to complete a mass-limited sample of 80 clusters of galaxies between 0.4 < z < 1.2, uniformly selected by the Sunyaev-Zeldovich effect from 2000 deg^2 surveyed by the South Pole Telescope. This sample increases the number of clusters at a similar mass threshold with X-ray observations by factors of 4 and 8 at z>0.6, 0.8, respectively, thereby providing a unique legacy sample for Chandra. These observations will significantly improve cluster-based dark energy constraints, are coordinated to overlap with several current and future cluster surveys, and will be uniquely valuable for the study of the formation and evolution of massive clusters.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
00:13:19.10	-49:06:50.40	SPT-CLJ0013-4906	ACIS-I	NONE	15.4
21:35:38.60	-57:26:27.20	SPT-CLJ2135-5726	ACIS-I	NONE	18.7
02:12:26.40	-46:57:00.70	SPT-CLJ0212-4656	ACIS-I	NONE	30.7
03:48:17.70	-45:14:59.30	SPT-CLJ0348-4514	ACIS-I	NONE	14.2
20:35:12.20	-52:51:05.40	SPT-CLJ2035-5251	ACIS-I	NONE	20.4
01:42:11.90	-50:32:36.20	SPT-CLJ0142-5032	ACIS-I	NONE	31.9
01:06:25.80	-59:43:17.00	SPT-CLJ0106-5943	ACIS-I	NONE	19.3
21:46:34.80	-46:32:57.80	SPT-CLJ2146-4632	ACIS-I	NONE	80.8
03:34:10.20	-46:59:22.90	SPT-CLJ0334-4659	ACIS-I	NONE	29
00:14:46.70	-49:52:37.60	SPT-CLJ0014-4952	ACIS-I	NONE	60.7
04:49:06.80	-49:01:17.00	SPT-CLJ0449-4901	ACIS-I	NONE	61.3
04:56:26.80	-51:16:25.00	SPT-CLJ0456-5116	ACIS-I	NONE	55.2
04:41:47.30	-48:54:45.00	SPT-CLJ0441-4854	ACIS-I	NONE	76.3
03:07:46.70	-50:42:22.30	SPT-CLJ0307-5042	ACIS-I	NONE	47.2
20:43:18.00	-50:35:26.50	SPT-CLJ2043-5035	ACIS-I	NONE	81.4
00:58:17.50	-61:45:36.40	SPT-CLJ0058-6145	ACIS-I	NONE	61
01:51:23.90	-59:54:07.60	SPT-CLJ0151-5954	ACIS-I	NONE	89
02:56:23.20	-56:17:46.30	SPT-CLJ0256-5617	ACIS-I	NONE	52
04:46:02.60	-58:49:17.40	SPT-CLJ0446-5849	ACIS-I	NONE	58.8
02:43:25.80	-59:30:43.60	SPT-CLJ0243-5930	ACIS-I	NONE	51.5
01:02:40.70	-46:03:53.60	SPT-CLJ0102-4603	ACIS-I	NONE	66.8
06:55:50.60	-52:34:02.60	SPT-CLJ0655-5234	ACIS-I	NONE	22.1
02:00:35.20	-48:52:37.60	SPT-CLJ0200-4852	ACIS-I	NONE	25.7
01:56:08.40	-55:41:37.30	SPT-CLJ0156-5541	ACIS-I	NONE	85.3
03:52:55.70	-56:47:53.20	SPT-CLJ0352-5647	ACIS-I	NONE	49.5
01:23:09.60	-48:21:19.40	SPT-CLJ0123-4821	ACIS-I	NONE	79.8
03:10:29.20	-46:46:52.30	SPT-CLJ0310-4646	ACIS-I	NONE	40.3
00:37:45.20	-50:47:37.70	SPT-CLJ0037-5047	ACIS-I	NONE	82.6
		SPT-CLJ0000-0000	ACIS-I	NONE	38.46
		SPT-CLJ0000-0000	ACIS-I	NONE	38.46
		SPT-CLJ0000-0000	ACIS-I	NONE	38.46
		SPT-CLJ0000-0000	ACIS-I	NONE	38.46
		SPT-CLJ0000-0000	ACIS-I	NONE	38.46
		SPT-CLJ0000-0000	ACIS-I	NONE	38.46
		SPT-CLJ0000-0000	ACIS-I	NONE	38.46
		SPT-CLJ0000-0000	ACIS-I	NONE	38.46
		SPT-CLJ0000-0000	ACIS-I	NONE	38.46
		SPT-CLJ0000-0000	ACIS-I	NONE	38.46
		SPT-CLJ0000-0000	ACIS-I	NONE	38.46
		SPT-CLJ0000-0000	ACIS-I	NONE	38.46
04:26:03.90	-54:55:16.30	SPT-CLJ0426-5455	ACIS-I	NONE	38.5
04:06:53.60	-48:04:52.30	SPT-CLJ0406-4804	ACIS-I	NONE	28.6
00:33:54.20	-63:26:37.70	SPT-CLJ0033-6326	ACIS-I	NONE	23.1
21:48:42.00	-61:16:42.60	SPT-CLJ2148-6116	ACIS-I	NONE	39.8
02:52:44.90	-48:24:45.40	SPT-CLJ0252-4824	ACIS-I	NONE	33.8
		SPT-CLJ0000-0000	ACIS-I	NONE	38.46

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800889

Title: One of the most powerful AGN outbursts in an enigmatic cluster ?

PI Name: Ming Sun

Outbursts of SMBHs have significant impact on structure formation and evolution. Their imprint on the ICM (e.g., cavities and shocks) provides an historical chronicle of the SMBH activity. Perhaps the most exciting features of AGN outbursts are large X-ray cavities. They trace the biggest explosions in the Universe that have strong impact on cluster properties. These large outbursts also pose important constraints on the evolution of the central SMBH. We propose a 68 ks observation of a cluster where a candidate of an X-ray cavity with a diameter of 270 kpc was revealed from a short exposure. If confirmed, it will be the largest X-ray cavity known and the associated AGN outburst will be among the most energetic ones. The cluster also has other intriguing properties that will be followed.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
03:34:16.00	-01:11:17.40	RX J0334.2-0111	ACIS-I	NONE	68

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800933

Title: Chandra Observation of the Most Massive Galaxy Clusters Detected in the South Pole Telescope Survey

PI Name: Gordon Garmire

We propose to complete X-ray observations of the 30 most significant clusters identified from the Sunyaev-Zel'dovich (SZ) effect in the South Pole Telescope 2500 deg2 Survey. The unique SZ selection makes this a complete, mass-limited sample of very massive clusters, 1015 < M200 < 3 x 1015 Msun, that span a broad redshift range, 0.18 < z < 1.132. These observations will improve our understanding of the evolution of the most massive clusters in the universe by providing multiple X-ray observables and the superb high spatial resolution of Chandra. To complete this sample we request observations of 7 clusters requiring a total 77 ksec.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
03:04:15.40	-44:01:52.30	SPT-CLJ0304-4401	ACIS-I	NONE	15
23:44:42.00	-42:42:52.60	SPT-CLJ2344-4242	ACIS-I	NONE	12
05:55:24.10	-64:05:52.40	SPT-CLJ0555-6405	ACIS-I	NONE	11
02:34:42.00	-58:31:14.20	SPT-CLJ0234-5831	ACIS-I	NONE	10
23:25:10.30	-41:11:37.30	SPT-CLJ2325-4111	ACIS-I	NONE	9

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800948

Title: RXJ1347-1145: the most luminous cluster in the Universe

PI Name: Stephen Murray

This 40 ks observation of RXJ1347_1145 will be used with the existing observation and a deep potential observation to probe the gas sloshing phenomenon, in which a merger subcluster causes a bulk motion of the hot gas in the core of the primary clusters. RXJ1347 is a primary example of this process.The extensive multiwavelength observations of RXJ1347 range from high resolution (10") SZ measurements to deep HST 14 filter images. These combined with extensive simulations and a deep Chandra image will allow us to measure the mass of the cluster components, the distribution of dark matter, as well as hot gas, and the timescale and nature of the merger, including the structure of the shock and to determine how well various mass proxies characterize the total mass in RXJ1347

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
13:47:30.60	-11:45:08.60	RXJ1347.5-1145	ACIS-I	NONE	40

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 13800951

Title: Completing X-ray Observations of the 20 Most Massive Clusters from the South Pole Telescope 2500 Square-Degree Survey

PI Name: Gordon Garmire

We propose a 10 ks Chandra observation of SPT-CL J2031-4037 (z=0.342) to complete X-ray observations of the 20 most significant clusters at z> 0.3 from the South Pole Telescope 2500-square-degree survey. In Chandra cycle 13 we proposed GTO observations of the remaining 9 clusters in this sample without approved Chandra or XMM observations. One of these clusters, SPT-CLJ2031-4037, is also the subject of a GO proposal by another proposer. Because one of our main science goals is to understand the statistical properties of SZ-selected clusters, it is important that to obtain X-ray observations of every object in our uniformly-selected sample. To ensure this, we propose this observation of SPT-CLJ2031-4037 to the GO program to complete X-ray observations our 20-cluster, SZ-selected sample.

R.A.	Dec.	Target Name	Det.	Grating	Exp.Time
20:31:50.40	-40:37:07.70	SPT-CLJ2031-4037	ACIS-I	NONE	10

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.