Journal
ASTROPHYSICAL JOURNAL
Volume 794, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/794/1/67
Keywords
galaxies: clusters: general; galaxies: clusters: intracluster medium; early universe; X-rays: galaxies: clusters
Categories
Funding
- NASA [HST-HF51308.01, 12800071, 12800088, 13800883]
- Space Telescope Science Institute
- Association of Universities for Research in Astronomy, Inc., for NASA [NAS 5-26555]
- National Science Foundation [ANT-0638937, PLR-1248097]
- 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
- U.S. Department of Energy [DE-AC02-06CH11357]
- NASA through the Einstein Fellowship Program [PF2-130094]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1009649] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1125897] Funding Source: National Science Foundation
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1248097] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1009012] Funding Source: National Science Foundation
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Confirming earlier results from this data set, we find an absence of strong cool cores at high z, manifested in this analysis as a significantly lower observed pressure in the central 0.1R(500) of the high-z cool-core subset of clusters compared to the low-z cool-core subset. Overall, our observed pressure profiles agree well with earlier lower-redshift measurements, suggesting minimal redshift evolution in the pressure profile outside of the core. We find no measurable redshift evolution in the entropy profile at r <= 0.7R(500)-this may reflect a long-standing balance between cooling and feedback over long timescales and large physical scales. We observe a slight flattening of the entropy profile at r >= R500 in our high-z subsample. This flattening is consistent with a temperature bias due to the enhanced (similar to 3x) rate at which group-mass (similar to 2 keV) halos, which would go undetected at our survey depth, are accreting onto the cluster at z similar to 1. This work demonstrates a powerful method for inferring spatially resolved cluster properties in the case where individual cluster signal-to-noise is low, but the number of observed clusters is high.
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