Journal
ASTROPHYSICAL JOURNAL
Volume 761, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/0004-637X/761/2/183
Keywords
galaxies: clusters: general; X-rays: galaxies: clusters
Categories
Funding
- National Science Foundation [ANT-0638937]
- The Cluster of Excellence Origin and Structure of the Universe
- Excellence Initiative of the Federal Government of Germany, EXC [153]
- Chandra X-ray Observatory Center [GO2-13006A]
- NSF Physics Frontier Center [PHY-0114422]
- Kavli Foundation
- Gordon and Betty Moore Foundation
- NSF [AST-1009012, AST-1009649, MRI-0723073]
- National Sciences and Engineering Research Council of Canada
- Canada Research Chairs program
- Canadian Institute for Advanced Research
- NASA [NAS 8-03060, HST-HF-51308.01]
- National Aeronautics and Space Administration [GO0-1114, NAS8-03060]
- Clay Fellowship
- KICP Fellowship
- Pennsylvania State University [2834-MIT-SAO-4018]
- Alfred P. Sloan Research Fellowship
- Smithsonian Institution
- Brinson Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009649, 1009012] Funding Source: National Science Foundation
- Division Of Physics
- Direct For Mathematical & Physical Scien [1125897] Funding Source: National Science Foundation
Ask authors/readers for more resources
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 deg(2) observed with the South Pole Telescope (SPT) and followed up by the Chandra X-ray Observatory. They form an approximately mass-limited sample (>3 x 10(14) M-circle dot h(70)(-1)) 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 (alpha). 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 5.4 sigma 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available