# Accepted Cycle 11 Observing Proposals

## CLUSTERS OF GALAXIES

Proposal NumberSubject CategoryPI NameTitle
11800028CLUSTERS OF GALAXIESGarmireChandra Observations of SZ-selected Galaxy Clusters Detected by the South Pole Telescope
11800049CLUSTERS OF GALAXIESPredehlX-ray view of a unique relic radio mini-halo in a poor cluster of galaxies
11800052CLUSTERS OF GALAXIESMurrayChandra observations of low-z galaxy groups
11800055CLUSTERS OF GALAXIESMurrayCHandra Extended Cluster Cosmology Sample (CHECCS)
11800058CLUSTERS OF GALAXIESMurrayA Chandra Study of a Complete Sample of SZE Selected Galaxy Clusters
11800074CLUSTERS OF GALAXIESMurrayChandra Observations of the Merging Clusters A98 and A1750
11800084CLUSTERS OF GALAXIESGittiInvestigating AGN feedback in cool cores detected in H\alpha
11800090CLUSTERS OF GALAXIESEbelingThe distribution and interactions of luminous and dark matter in strong-lensing clusters at z>0.3
11800102CLUSTERS OF GALAXIESFabianExtending the Deep Image of the Perseus Cluster: The Outer Bubbles, Filaments and Ripples
11800193CLUSTERS OF GALAXIESSandersTesting AGN feedback with AWM7
11800194CLUSTERS OF GALAXIESDavidTesting the Universality of the Gas Mass Fraction in Clusters of Galaxies
11800242CLUSTERS OF GALAXIESEbelingMACSJ0358.8-2955: much more distant and exciting than we thought
11800319CLUSTERS OF GALAXIESEllingsonMassive Galaxy Clusters at High Redshift from the Spitzer SpARCS Survey
11800323CLUSTERS OF GALAXIESBonamenteCosmology with a complete sample of 0.15
11800341CLUSTERS OF GALAXIESFabianThe X-ray Luminous Cluster underlying the z=1.04 blazar PKS 1229-02: Does it have a cool core?
11800350CLUSTERS OF GALAXIESRussellCompleting the cycle of cooling, star formation and AGN heating in Brightest Cluster Galaxies
11800376CLUSTERS OF GALAXIESBoehringerChandra Study of the very X-ray Luminous Distant Galaxy Cluster XMMUJ1230+1339 at z = 0.975
11800387CLUSTERS OF GALAXIESKraftHeating group gas via the supersonic inflation of radio lobes: a deep Chandra observation of 3C 449
11800471CLUSTERS OF GALAXIESMohrChandra Observations of a Complete Sample of SZE Selected Galaxy Clusters
11800515CLUSTERS OF GALAXIESStawarzPowerful Radio Sources in the Centers of Nearby Clusters
11800517CLUSTERS OF GALAXIESSunStrong shocks, cavities and AGN heating in galaxy groups
11800539CLUSTERS OF GALAXIESMachacekBlack Hole Masses and the Merger of High Velocity Dispersion Galaxy NGC6861 with NGC6868 in the AS0851 Galaxy Group
11800560CLUSTERS OF GALAXIESMaozMACS1354+77: A new bullet' cluster?
11800640CLUSTERS OF GALAXIESOguriThe Chandra View of the Largest Quasar Lens SDSS J1029+2623
11800671CLUSTERS OF GALAXIESIrwinChandra Observations of Two Unusual Lensing Groups of Galaxies
11800700CLUSTERS OF GALAXIESDonahueThe Strongest Cool Core Cluster in the REXCESS X-ray Cluster Sample
11800709CLUSTERS OF GALAXIESWernerStudy of the interaction between the puzzling AGN and the hot gas in the cooling core of Sersic 159-03
11800792CLUSTERS OF GALAXIESvon der LindenAnatomy of a merger: the curious case of MACS J0417.5-1154
11800852CLUSTERS OF GALAXIESRykoffThe X-Ray, SZ, and Optical Scaling Relations of Massive Galaxy Clusters

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800028

Title: Chandra Observations of SZ-selected Galaxy Clusters Detected by the South Pole Telescope

PI Name: Gordon Garmire

We propose a 180 ks program to observe 7 cluster candidates from the South Pole Telescope cluster survey. These clusters have been identified via the Sunayev-Zel'dovich effect (SZ) as S/N>5.5 candidates using the South Pole Telescope. This is part of a combined GO/GTO (in conjunction with the HRC team) program to establish an unbiased, SZ-flux limited sample of ~100 clusters to be observed with Chandra. Chandra observations of clusters detected by the SPT survey will provide an accurate measurement of the high mass end of the mass function, where the sensitivity to the underlying cosmology is largest.

R.A. Dec. Target Name Det. Grating Exp.Time
23:37:25.20-59:42:28.80SPT-CL2337-5942ACIS-INONE20
05:59:41.30-52:49:08.40SPT-CL0600-5249ACIS-INONE20
23:31:50.20-50:51:50.40SPT-CL2332-5052ACIS-INONE20
00:00:59.30-57:48:28.80SPT-CL0001-5749ACIS-INONE20
23:59:40.60-50:09:39.60SPT-CL0000-5010ACIS-INONE20
05:46:36.00-53:45:21.60SPT-CL0547-5345ACIS-INONE60

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800049

Title: X-ray view of a unique relic radio mini-halo in a poor cluster of galaxies

PI Name: Peter Predehl

MRC 0116+111 (z = 0.132) is a poor cluster of galaxies containing one of the most luminous known radio mini-halos. It differs from all other known mini-halos: it shows a double-lobe like diffuse structure surrounding a cD galaxy, but no signs of current AGN activity. Its morphology and integrated radio spectral index indicate that the relic electrons have been re-accelerated. X-ray data of this unusual system are completely lacking. This system presents the best opportunity to study the dynamical evolution of radio jet inated plasma bubbles in the cluster gas when the central AGN becomes inactive. The proposed observation will allow us to detect the system down to a luminosity of 8e40 erg/s. Non-detection will put a lower limit of B = 6.75 uG on the volume averaged magnetic field.

R.A. Dec. Target Name Det. Grating Exp.Time
01:19:01.40+11:23:25.00MRC 0116+111ACIS-SNONE18.5

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800052

Title: Chandra observations of low-z galaxy groups

PI Name: Steve Murray

We propose to observe two objects which will complete a sample of galaxy groups by Sun et al. Chandra data will be used to measure the temperature and metallicity profiles to r=r500, and to derive mass and entropy profiles.

R.A. Dec. Target Name Det. Grating Exp.Time
21:37:51.20-42:51:08.00cl2137−4251ACIS-SNONE25
04:22:28.80-50:09:01.00cl0422−5009ACIS-SNONE15

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800055

Title: CHandra Extended Cluster Cosmology Sample (CHECCS)

PI Name: Steve Murray

We propose to extend the available Chandra observations of well defined galaxy cluster samples for cosmological studies towards higher redshift. The CHandra Extended Cluster Cosmology Sample (CHECCS) comprises the highest flux objects at z>0.8 serendipitously selected from 20 sq. deg. of deep and clean XMM-Newton archival data. The CHECCS follow-up observations will allow a systematic study of galaxy cluster structure and scaling relations at the highest accessible redshifts for Chandra and will provide an increased redshift leverage for cosmological model constraints.

R.A. Dec. Target Name Det. Grating Exp.Time
02:36:05.10-52:25:10.00XMMUJ0236-5225ACIS-INONE40
01:52:41.30-13:38:54.30XMMUJ0152-1338ACIS-INONE40

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800058

Title: A Chandra Study of a Complete Sample of SZE Selected Galaxy Clusters

PI Name: Steve Murray

We propose an investigation of a complete sample of clusters selected through their Sunyaev-Zeldovich signature. These clusters, detected using the South Pole Telescope from an area of several hundred square degrees, represent the first clusters detected from an SZ survey to be observed in X-rays. The Chandra observations will provide cluster mass estimates through the mass proxies including gas temperature, gas mass, and Yx.

R.A. Dec. Target Name Det. Grating Exp.Time
23:41:11.80-51:19:51.60SPT2341-5120ACIS-INONE20
23:42:45.10-54:11:20.40SPT2343-5411ACIS-INONE20
05:51:35.30-57:09:21.60SPT0552-5709ACIS-INONE20
23:43:00.70-55:21:46.80SPT2343-5522ACIS-INONE20
05:09:19.90-53:42:07.20SPT0509-5342ACIS-INONE20
05:33:35.50-50:05:24.00SPT0534-5005ACIS-INONE20
05:28:02.60-52:59:52.80SPT0528-5300ACIS-INONE30

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800074

Title: Chandra Observations of the Merging Clusters A98 and A1750

PI Name: Steve Murray

We propose ACIS observations for two X-ray bright merging clusters with the primary goal being to understand changes in the gas density, temperature, pressure, and entropy distribution of the ICM brought about through major mergers. The two clusters A98 and A1750 are in an early stage of subcluster interaction. For each cluster, we will generate maps of the gas density, temperature, entropy and pressure. We will search for surface brightness edges due to shocks or cold fronts'' and measure their Mach numbers. We will determine the extent of gas mixing. We will compare these results to the ICM properties in relaxed clusters to determine the impact of mergers on the cluster gas.

R.A. Dec. Target Name Det. Grating Exp.Time
00:46:29.30+20:28:05.00A98sACIS-SNONE20
00:46:24.80+20:37:17.00A98nACIS-SNONE20
13:31:08.30-01:40:58.80A1750nACIS-INONE20
13:30:50.30-01:52:28.00A1750sACIS-INONE20

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800084

Title: Investigating AGN feedback in cool cores detected in H\alpha

PI Name: Myriam Gitti

Chandra has changed our understanding of the cool cores of galaxy clusters from a relatively simple place where gas is cooling and flowing towards the center to a very dynamic place where heating from the central AGN and cooling, as inferred from active star formation, molecular gas and H\alpha nebulosity, find an uneasy balance. With the aim to get a comprehensive picture of the AGN feedback mechanism, we propose to investigate the X-ray/radio interaction in a compilation of targets selected among the brightest X-ray clusters and the most luminous emitters in H\alpha, which is a promising diagnostic of cool gas in cluster cores. We request joint Chandra and VLA observations of four objects for a total exposure of 287ks and 28h, respectively (44ks and 3h for the top-priority target).

R.A. Dec. Target Name Det. Grating Exp.Time
17:44:14.40+32:59:24.00Zw 1742.1+3306ACIS-SNONE44

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800090

Title: The distribution and interactions of luminous and dark matter in strong-lensing clusters at z>0.3

PI Name: Harald Ebeling

We propose ACIS-I observations of 7 very X-ray luminous clusters at 0.3
R.A. Dec. Target Name Det. Grating Exp.Time
07:12:20.40+59:32:21.00MACSJ0712.3+5931ACIS-INONE26
21:35:12.10-01:02:56.00MACSJ2135.2-0102ACIS-INONE27
01:50:21.30-10:05:30.00MACSJ0150.3-1005ACIS-INONE27
09:40:53.70+07:44:25.00MACSJ0940.9+0744ACIS-INONE28

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800102

Title: Extending the Deep Image of the Perseus Cluster: The Outer Bubbles, Filaments and Ripples

PI Name: Andrew Fabian

Our existing 900ks image of the core of the Perseus cluster has revealed a wealth of detail on the bubbles, shocks and ripples caused by the action of the central AGN on the surrounding ICM. Most of the advances are directly due to the high surface brightness of the Perseus cluster (higher than any other cluster) and to the high spatial resolution of Chandra. This resolution is degraded significantly 4 arcmin or more off-axis, meaning that the region studied at the highest resolution is quite small. Here we propose three further exposures totalling 700ks to extend the highest resolution region, covering areas to the N and S of the nucleus where the current data suggest the presence of further intriguing and important structures due to the AGN activity.

R.A. Dec. Target Name Det. Grating Exp.Time
03:19:44.20+41:25:18.00Perseus cluster, Abell 426ACIS-INONE300
03:19:39.50+41:36:01.41Perseus cluster, Abell 426ACIS-INONE200

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800193

Title: Testing AGN feedback with AWM7

PI Name: Jeremy Sanders

We aim to test the theory that AGN are responsible for the prevention of significant gas cooling in the cores of galaxy clusters. AWM7 is the only cluster in the bright cluster sample of Dunn & Fabian (2006, 2008) with a short central cooling time no evidence of significant AGN feedback. The cluster is the 5th brightest in the sky from the HIFLUGCS ROSAT cluster sample. By doubling the signal to noise ratio of the existing Chandra observation and with a joint VLA observation, we propose to search for evidence of old or recent AGN feedback in this cluster. We will look for signs of AGN activity by looking for cavities, weak shocks or extended radio emission.

R.A. Dec. Target Name Det. Grating Exp.Time
02:54:27.50+41:34:45.00AWM7ACIS-INONE130

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800194

Title: Testing the Universality of the Gas Mass Fraction in Clusters of Galaxies

PI Name: Laurence David

The independence of the gas mass fraction in clusters of galaxies as a function of redshift is a key assumption in some precision cosmological studies. However, there is very little empirical evidence at the present time to support this claim. A recent study found that the gas mass fraction in a sample of optical selected clusters at intermediate redshifts (0.6 < z < 1.1) is substantially lower than that determined from nearby X-ray selected clusters. We propose a deep Chandra observation of the RCS 2318+0034 cluster, which has a reported gas mass fraction of 1.5%, compared to the average for X-ray selected nearby clusters of about 13%, to more accurately determine the gas mass fraction in this cluster.

R.A. Dec. Target Name Det. Grating Exp.Time
23:18:31.00+00:34:00.40RCS 2318+0034ACIS-INONE150

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800242

Title: MACSJ0358.8-2955: much more distant and exciting than we thought

PI Name: Harald Ebeling

We propose a short observation of MACSJ0358.8-2955, an extremely X-ray luminous cluster at z=0.434 (previously believed to be at z=0.17), to obtain first constraints on the spatial distribution of the gaseous intra-cluster medium in the cluster core. HST/ACS observations show the system to be highly disturbed as evinced by a string of giant elliptical galaxies and multiple gravitational arc systems delineating a very elongated critical line. At Lx=1.8e45 erg/s this system is not only the by far most X-ray luminous cluster known at any redshift that has yet to be observed by Chandra, it is also a prime candidate for a detailed study of cluster dynamics and the segregation of dark and luminous matter. The short observation proposed here will establish whether an in-depth study is warranted.

R.A. Dec. Target Name Det. Grating Exp.Time
03:58:53.00-29:55:35.00MACSJ0358.8-2955ACIS-INONE10

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800319

Title: Massive Galaxy Clusters at High Redshift from the Spitzer SpARCS Survey

PI Name: Erica Ellingson

We propose ACIS-S observations of a sample of four high redshift galaxy clusters with 0.87 < z < 1.34 discovered by the 42 square degree Spitzer Adaptation of the Red Sequence Survey (SpARCS). This survey is currently the largest optical/IR survey for high redshift clusters, and includes significant multi-wavelength follow-up. Extensive Gemini spectroscopic observations have confirmed that all of our targets are rich, massive clusters with velocity dispersions ranging from 650-1000 km/sec. Our Chandra observations are designed to detect the extended intra-cluster medium in the cluster cores, provide rough constraints on core gas densities, and probe the AGN population in these fields.

R.A. Dec. Target Name Det. Grating Exp.Time
16:16:41.00+55:45:26.00EN1-349ACIS-SNONE65
00:35:50.00-43:12:24.00ES1-351ACIS-SNONE65
16:13:14.00+56:49:29.00EN1-240ACIS-SNONE30

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800323

Title: Cosmology with a complete sample of 0.15
PI Name: Massimiliano Bonamente

We propose to re-observe 12 clusters from a complete sample of 35 luminous clusters in the redshift range 0.15
R.A. Dec. Target Name Det. Grating Exp.Time
07:32:17.80+31:37:33.70Abell 586ACIS-INONE10
11:57:22.50+33:39:18.10Abell 1423ACIS-INONE26
13:06:49.70+46:32:59.00Abell 1682ACIS-INONE21
15:39:38.30+34:24:21.00Abell 2111ACIS-INONE21
12:33:52.80+09:49:48.00ZwCl 5247ACIS-INONE21
23:37:39.70+00:17:36.90Abell 2631ACIS-INONE17
04:37:09.80+00:43:37.00RX J0437.1+0043ACIS-INONE32
23:11:26.90+03:35:18.60Abell 2552ACIS-INONE22

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800341

Title: The X-ray Luminous Cluster underlying the z=1.04 blazar PKS 1229-02: Does it have a cool core?

PI Name: Andrew Fabian

We propose a 100ks observation of the radio-loud quasar PKS 1229-02 at z=1.043 in order to study the surrounding diffuse X-ray emission revealed in an 18 ks archival Chandra image. The size and spectrum of the diffuse emission coupled with high Faraday rotation in the radio band strongly point to it being an X-ray luminous cool core cluster of galaxies. Such clusters are rarely found at high redshift, possibly because the central black hole is very active. The proposed data will give valuable information on the origin of the cool core phenomenon, which is central to radio mode AGN feedback.

R.A. Dec. Target Name Det. Grating Exp.Time
12:31:60.00-02:24:05.30PKS 1229-02ACIS-SNONE100

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800350

Title: Completing the cycle of cooling, star formation and AGN heating in Brightest Cluster Galaxies

PI Name: Helen Russell

Recent studies have shown that the energy input from AGN feedback, when averaged over the cluster lifetime, is capable of balancing cooling losses from the cluster gas. Spitzer observations have revealed that 30-50% of BCGs in cool core clusters exhibit star formation suggesting that current AGN heating may not be sufficiently strong to prevent cooling. We propose here to observe objects with low rates of star formation to investigate the transition into a cooling phase and the physical mechanism which triggers the formation of stars in BCGs. Combining X-ray-derived gas cooling times and estimates of AGN cavity power with IR-derived star formation rates will allow us to study the entire cycle of cooling, star formation and feedback in cluster cool cores.

R.A. Dec. Target Name Det. Grating Exp.Time
23:36:42.40+23:55:06.00Abell 2627ACIS-SNONE45
14:32:37.90+31:38:49.00Abell 1930ACIS-SNONE35
09:24:05.30+14:10:22.00Abell 795ACIS-SNONE30
00:43:52.10+24:24:22.00ZwCl 235ACIS-SNONE20

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800376

Title: Chandra Study of the very X-ray Luminous Distant Galaxy Cluster XMMUJ1230+1339 at z = 0.975

PI Name: Hans Boehringer

We propose a deep CHANDRA observation of one of the two most prominent X-ray luminous clusters at redshift around unity, XMMU J1230+1339 (Lx ~ 3 10e44 erg/s in 0.5 to 2.0 keV). The cluster found in our serendipitous XMM-Newton survey is also optically astonishingly rich. The main objective of the observation is to secure precise values of the global cluster parameters which can also be used as mass proxies: X-ray luminosity, temperature, gas mass and the Yx parameter. These properties and a good mass estimate are important for our detailed study of high z cluster galaxy populations, to establish scaling relations of clusters at this redshift, and to contribute to the compilation of a small sample of well characterized clusters at z > 0.8 for cosmological studies.

R.A. Dec. Target Name Det. Grating Exp.Time
12:30:16.90+13:39:04.00XMMUJ1230+1339ACIS-SNONE75

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800387

Title: Heating group gas via the supersonic inflation of radio lobes: a deep Chandra observation of 3C 449

PI Name: Ralph Kraft

We propose a 120 ks Chandra/ACIS-S observation of the hot gas around the canonical FRI radio galaxy 3C 449, which is embedded in a 1.5 keV group. An existing short archival observation shows evidence for a strong shock (Mach number 1.5-2.0) around the inner radio lobes. This is supported by the presence of an entropy spike in the gas (Sun et al. 2009). We will confirm the presence of this shock with the proposed observation, and measure the total energy, age, and time averaged power of the outburst. Confirmation of the presence of this strong shock would be the first such example in a group, and conclusively demonstrate that shock heating plays an important role in the thermodynamic evolution of the group gas.

R.A. Dec. Target Name Det. Grating Exp.Time
22:31:20.90+39:21:48.003C 449ACIS-SNONE120

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800471

Title: Chandra Observations of a Complete Sample of SZE Selected Galaxy Clusters

PI Name: Joseph Mohr

We propose to obtain X-ray observations of a complete sample of 16 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 200 deg^2 SPT survey. The Chandra observations provide X-ray mass estimates and morphologies, allowing (1) an initial calibration of the SZE flux-mass relation and (2) early tests of cosmology and the evolution of structure. Our 346ks request leverages 625ks of GTO time in AO10/11; these X-ray data are crucial to developing an understanding of the new window on the universe that SPT has opened and in laying the foundation for future studies using the full SPT survey (~1400deg^2 by 2010).

R.A. Dec. Target Name Det. Grating Exp.Time
23:31:50.20-50:51:50.40SPT-CL 2332-5052ACIS-INONE5.9
05:46:36.00-53:45:21.60SPT-CL 0547-5345ACIS-INONE23.9
00:00:59.30-57:48:28.80SPT-CL 0001-5749ACIS-INONE7.3
23:42:45.10-54:11:20.40SPT-CL 2343-5411ACIS-INONE64.1
23:59:40.60-50:09:39.60SPT-CL 0000-5010ACIS-INONE22.7
05:51:35.30-57:09:21.60SPT-CL 0552-5709ACIS-INONE16.5
23:43:00.70-55:21:46.80SPT-CL 2343-5522ACIS-INONE75
05:09:19.90-53:42:07.20SPT-CL 0509-5342ACIS-INONE5.9
23:55:49.70-50:56:09.60SPT-CL 2356-5056ACIS-INONE11.5
05:28:02.60-52:59:52.80SPT-CL 0528-5300ACIS-INONE38.5
05:33:35.50-50:05:24.00SPT-CL 0534-5005ACIS-INONE75

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800515

Title: Powerful Radio Sources in the Centers of Nearby Clusters

PI Name: Lukasz Stawarz

We propose joint Chandra/XMM observations of two powerful FRII radio galaxies at the centers of the two nearby Abell clusters 1836 and 578. The relevance of the proposed research comes from the fact that, on one hand, heating of clusters by AGN requires large jet powers (appropriate for FRII galaxies), while on the other hand, the majority of the currently studied cases of cD-hosted radio-loud AGN are in fact low-power FR I sources. As the two targets are the only FR II radio galaxies known at the centers of local (z<0.25) Abell clusters, the proposed observations will enable us for investigating the role of powerful jets in cluster heating, by constraining the source energetics and resolving various X-ray features within and outside the radio structures embedded in the clusters.

R.A. Dec. Target Name Det. Grating Exp.Time
07:24:54.10+66:59:10.40Abell 0578ACIS-SNONE40
14:01:41.90-11:36:25.10Abell 1836ACIS-INONE60

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800517

Title: Strong shocks, cavities and AGN heating in galaxy groups

PI Name: Ming Sun

Outbursts of SMBHs have significant impact on structure formation and evolution. Their imprint on ICM (e.g., shocks, cavities, elevated entropy) provides an historical chronicle of the SMBH activity. However, AGN heating has not been well studied in groups (especially for groups hosting strong radio AGN), although it should affect the group gas much more than the cluster gas. We propose deep observations of two groups with strong radio AGN. Both have promising candidates of strong shocks from the existing short observations, which also reveals a cavity with little radio emission. The results may yield the first strong shock detection in groups and also fill the unexplored regime of the L_{radio} - L_{jet power} plane for groups. Joint VLA observations for one groups are also requested.

R.A. Dec. Target Name Det. Grating Exp.Time
03:27:53.60+02:33:41.003C88ACIS-SNONE109

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800539

Title: Black Hole Masses and the Merger of High Velocity Dispersion Galaxy NGC6861 with NGC6868 in the AS0851 Galaxy Group

PI Name: Marie Machacek

We propose to probe the connection between the shape of the high mass end of the black hole scaling relations and galaxy interactions, AGN feedback, and black hole growth using ACIS-I X-ray observations of the merger of high velocity dispersion galaxy NGC6861 with NGC6868 in the AS0851 galaxy group. We will measure the temperature rise in the inner 300 pc of NGC6861 to investigate the mass of its central black hole and test the black hole mass - velocity dispersion correlation. We will measure temperatures and densities across cold fronts, shocks, tails and cavities to constrain the orbital parameters, dynamical forces and AGN feedback in the merger of NGC681 with NGC6868 to resolve the order of magnitude discrepancy between the black hole scaling relations for NGC6861.

R.A. Dec. Target Name Det. Grating Exp.Time
20:07:19.50-48:22:13.00NGC6861ACIS-INONE100
20:09:54.10-48:22:46.00NGC6868ACIS-INONE75

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800560

Title: MACS1354+77: A new bullet' cluster?

PI Name: Dan Maoz

The "bullet cluster", consisting of two galaxy clusters shortly after collision, has been an invaluable laboratory for physics on many scales: cosmological structure formation, merger evolution, dark matter physics, and shock hydrodynamics. Additional such systems, with different parameters (time post-collision, component mass ratios, collision and shock velocities, line-of-sight orientations) are needed. We have found a new candidate system of this kind at z=0.4, with multiple strong-lensing features that permit accurate modeling of the two, roughly equal, mass distributions. A brief exploratory Chandra observation will reveal if this object is another bullet-type case. Based on previous examples of merging clusters, this initial experiment will already enable a wealth of science.

R.A. Dec. Target Name Det. Grating Exp.Time
13:54:30.60+77:15:20.90MACSJ1354.6+7715ACIS-INONE33

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800640

Title: The Chandra View of the Largest Quasar Lens SDSS J1029+2623

PI Name: Masamune Oguri

We propose to observe SDSS J1029+2623, a rare lens system that consists of three z=2.197 quasar images and a massive lensing cluster at z=0.6. The maximum image separation of 22.5 arcsec makes it the largest lens among the 100 known lensed quasars. We will use 60 ksec ACIS-S observation to study this strong-lens selected cluster, by comparing its X-ray properties with independent strong and weak lensing constraints. The Chandra observation will also be useful to understand the anomalous flux ratios of the quasar images observed in optical. In particular, the X-ray spectrum of the faintest quasar image should be crucial to distinguish whether the anomaly is caused by microlensing or dust extinction.

R.A. Dec. Target Name Det. Grating Exp.Time
10:29:13.30+26:23:32.80SDSS J1029+2623ACIS-SNONE60

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800671

Title: Chandra Observations of Two Unusual Lensing Groups of Galaxies

PI Name: Jimmy Irwin

We propose Chandra observations of two unusual strong gravitational lenses found by the CASSOWARY gravitational lens survey. Both lenses appear to be high mass concentration groups/galaxies with extreme properties. The Cheshire Cat Lens is caused by what could be to be merging fossil groups at a redshift of 0.43. The implied projected mass within the 62 kpc Einstein Ring encloses a staggering 5e13 solar masses. The Cosmic Horseshoe Lens has a nearly perfectly circular Einstein Ring centered on a z=0.44 giant elliptical galaxy which could conceivably be one of the most massive galaxies in the Universe. Our observations will determine the temperature, density, and masses of these systems to reveal the nature of the objects responsible for these most unusual strong lenses.

R.A. Dec. Target Name Det. Grating Exp.Time
10:38:47.90+48:49:17.90Cheshire Cat LensACIS-SNONE70

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800700

Title: The Strongest Cool Core Cluster in the REXCESS X-ray Cluster Sample

PI Name: Megan Donahue

We propose to obtain high-resolution imaging of the most extreme cool core cluster in the REXCESS sample: RXJ2014.8-2430. REXCESS is a representative z~0.1 sample of 31 clusters spanning a wide range in luminosity, mass, and temperature. It was designed to avoid bias in X-ray morphology or central surface brightness. Nearly a million seconds of XMM time has been invested to measure the X-ray properties of these clusters, and they have extensive ground-based radio and optical observations. The unique radio, UV, and optical emission-line properties of RXJ2014 among the REXCESS clusters makes it the highest-priority REXCESS target for Chandra. Because of its high central brightness, a relatively short exposure will allow the study any AGN bubbles, shocks, and multi-phase gas in its core.

R.A. Dec. Target Name Det. Grating Exp.Time
20:14:51.70-24:30:22.90RXJ2014.8-2430ACIS-SNONE20

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800709

Title: Study of the interaction between the puzzling AGN and the hot gas in the cooling core of Sersic 159-03

PI Name: Norbert Werner

We propose a deep (100 ks) observation of the nearby, X-ray bright, cooling core cluster Sersic 159-03 (A S1101) which shows a broad multi-temperature structure indicating a strong interaction between the hot gas and the active galactic nucleus (AGN). Recent GMRT observations indicate the possible presence of two pairs of orthogonal radio jets. These features may be caused by a sudden change of the spin axis of the supermassive black hole or, alternatively, two different radio loud AGN may reside in the nucleus of the cD galaxy, possibly forming a gravitationally bound binary. Chandra will allow us to study in detail the interaction between the radio jets and the hot plasma, the energetics of the feedback, and discriminate on the twin AGN model for the core of the cD galaxy.

R.A. Dec. Target Name Det. Grating Exp.Time
23:13:58.50-42:43:39.00Sersic 159-03 (A S1101)ACIS-INONE100

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800792

Title: Anatomy of a merger: the curious case of MACS J0417.5-1154

PI Name: Anja von der Linden

MACS J0417.5-1154 is a remarkable merger of a very massive cluster and a smaller subcluster. A previous 11 ksec Chandra exposure shows the hot gas distribution to appear distinctly comet-like: the peak is centered on the cD galaxy of the main cluster; the tail, however, extends several hundred kpc and encompasses a pair of giant ellipticals. Optical imaging reveals a bridge of intra-cluster light between the three galaxies, strengthening the hypothesis that this is a merger system with a low impact parameter, seen after pericentric passage. The proposed 80 ksec Chandra observation will allow us to map the detailed thermodynamic state of the system, to study how the merging process affects the cluster cores, and investigate the origin and state of the stripped gas in the tail.

R.A. Dec. Target Name Det. Grating Exp.Time
04:17:34.30-11:54:26.60J0417.5-1154ACIS-INONE80

Subject Category: CLUSTERS OF GALAXIES

Proposal Number: 11800852

Title: The X-Ray, SZ, and Optical Scaling Relations of Massive Galaxy Clusters

PI Name: Eli Rykoff

A multi-wavelength approach to cluster cosmology is necessary to overcome systematic uncertainties in the relation between cluster mass and observable mass tracers. We propose short observations of 12 of the 25 richest optical clusters in the redshift range 0.2
R.A. Dec. Target Name Det. Grating Exp.Time
11:36:13.00+40:02:35.80A1319ACIS-SNONE10
12:33:53.00+15:11:40.70SDSS J1233+1511ACIS-INONE13
12:01:16.80+23:06:32.70SDSS J1201+2306ACIS-SNONE7
12:49:32.40+49:53:43.80A1622ACIS-INONE13
14:44:31.80+31:13:36.00A1961ACIS-SNONE7
01:04:55.40+00:03:36.30SDSS J0104+0003ACIS-INONE15
12:29:02.50+47:37:20.50A1550ACIS-SNONE7
09:28:04.50+20:31:45.20A801ACIS-SNONE7
09:22:07.70+03:45:58.80SDSS J0922+0345ACIS-INONE10
23:41:17.00-09:01:11.80A2645ACIS-SNONE5
11:23:58.80+21:28:49.70A1246ACIS-INONE5
13:27:01.00+02:12:19.50RXC J1327+0211ACIS-INONE7