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High-redshift Cool-core Galaxy Clusters Detected via the Sunyaev-Zel'dovich Effect in the South Pole Telescope Survey

Semler, D. L. and Lueker, M. and Padin, S. and Shirokoff, E. and Vieira, J. D. (2012) High-redshift Cool-core Galaxy Clusters Detected via the Sunyaev-Zel'dovich Effect in the South Pole Telescope Survey. Astrophysical Journal, 761 (2). Art. No. 183. ISSN 0004-637X. doi:10.1088/0004-637X/761/2/183.

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We report the first investigation of cool-core properties of galaxy clusters selected via their Sunyaev-Zel'dovich (SZ) effect. We use 13 galaxy clusters uniformly selected from 178 deg2 observed with the South Pole Telescope (SPT) and followed up by the Chandra X-ray Observatory. They form an approximately mass-limited sample (>3 × 10^(14) M_☉ h^(–1)_(70)) spanning redshifts 0.3 < z < 1.1. Using previously published X-ray-selected cluster samples, we compare two proxies of cool-core strength: surface brightness concentration (c_(SB)) and cuspiness (α). We find that c_(SB) is better constrained. We measure c_(SB) for the SPT sample and find several new z > 0.5 cool-core clusters, including two strong cool cores. This rules out the hypothesis that there are no z > 0.5 clusters that qualify as strong cool cores at the 5.4σ level. The fraction of strong cool-core clusters in the SPT sample in this redshift regime is between 7% and 56% (95% confidence). Although the SPT selection function is significantly different from the X-ray samples, the high-z c_(SB) distribution for the SPT sample is statistically consistent with that of X-ray-selected samples at both low and high redshifts. The cool-core strength is inversely correlated with the offset between the brightest cluster galaxy and the X-ray centroid, providing evidence that the dynamical state affects the cool-core strength of the cluster. Larger SZ-selected samples will be crucial in understanding the evolution of cluster cool cores over cosmic time.

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Additional Information:© 2012 American Astronomical Society. Received 2012 August 16; accepted 2012 October 30; published 2012 December 6. The South Pole Telescope program is supported by the National Science Foundation through grant ANT-0638937. The Munich group is supported by The Cluster of Excellence “Origin and Structure of the Universe,” funded by the Excellence Initiative of the Federal Government of Germany, EXC project No. 153. Galaxy cluster research at the University of Chicago is partially supported by Chandra award No. GO2-13006A issued by the Chandra X-ray Observatory Center. Partial support is also provided by the NSF Physics Frontier Center grant PHY-0114422 to the Kavli Institute of Cosmological Physics at the University of Chicago, the Kavli Foundation, and the Gordon and Betty Moore Foundation. Galaxy cluster research at Harvard is supported by NSF grant AST-1009012. Galaxy cluster research at SAO is supported in part by NSF grants AST-1009649 and MRI-0723073. The McGill group acknowledges funding from the National Sciences and Engineering Research Council of Canada, Canada Research Chairs program, and the Canadian Institute for Advanced Research. X-ray research at the CfA is supported through NASA contract NAS 8-03060. Support for X-ray analysis is provided by the National Aeronautics and Space Administration through Chandra award No. GO0-1114 issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics Space Administration under contract NAS8-03060. R.J.F. is supported by a Clay Fellowship. B.A.B is supported by a KICP Fellowship. M. Bautz and M.M acknowledge support from contract 2834-MIT-SAO-4018 from the Pennsylvania State University to the Massachusetts Institute of Technology. M.M acknowledges support from NASA Hubble fellowship grant HST-HF-51308.01. M.D. acknowledges support from an Alfred P. Sloan Research Fellowship, C.J. acknowledges support from the Smithsonian Institution, and B.S. acknowledges support from the Brinson Foundation. The authors thank Marcella Brusa for her helpful discussion.
Funding AgencyGrant Number
Federal Government of Germany Excellence Initiative EXC Project153
NASA Chandra AwardGO2-13006A
NSF Physics Frontier CenterPHY-0114422
Caltech Kavli Nanoscience InstituteUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
National Sciences and Engineering Research Council of Canada (NSERC)UNSPECIFIED
Canada Research Chairs programUNSPECIFIED
Canadian Institute for Advanced Research (CIAR)UNSPECIFIED
NASANAS 8-03060
NASA Chandra AwardGO0-11143
Clay FellowshipUNSPECIFIED
Pennsylvania State University2834-MIT-SAO-4018
NASA Hubble fellowship grantHST-HF-51308.01
Alfred P. Sloan Research FellowshipUNSPECIFIED
Smithsonian InstitutionUNSPECIFIED
Brinson FoundationUNSPECIFIED
Subject Keywords:galaxies: clusters: general; X-rays: galaxies: clusters
Issue or Number:2
Record Number:CaltechAUTHORS:20130114-074449785
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Official Citation:High-redshift Cool-core Galaxy Clusters Detected via the Sunyaev-Zel'dovich Effect in the South Pole Telescope Survey D. R. Semler et al. 2012 ApJ 761 183
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36340
Deposited By: Ruth Sustaita
Deposited On:14 Jan 2013 16:53
Last Modified:09 Nov 2021 23:21

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