THE REDSHIFT EVOLUTION OF THE MEAN I EMPERATURE, PRESSURE, AND ENTROPY PROFILES IN 80 SPT-SELECTED GALAXY CLUSTERS

McDonald M.; Benson, BA; Vikhlinin, A.; Aird, KA; Allen, SW; Bautz, M.; Bayliss, M.; Bleem, LE; Bocquet S.; Brodwin M.; Carlstrom, JE; Chang, CL; Cho, HM; Clocchiatti, A.; Crawford, TM; et. al.

Keywords: early universe, galaxies: clusters: general, x-rays: galaxies: clusters, galaxies: clusters: intracluster medium

Abstract

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.

Más información

Título según WOS: THE REDSHIFT EVOLUTION OF THE MEAN I EMPERATURE, PRESSURE, AND ENTROPY PROFILES IN 80 SPT-SELECTED GALAXY CLUSTERS
Título según SCOPUS: The redshift evolution of the mean temperature, pressure, and entropy profiles in 80 spt-selected galaxy clusters
Título de la Revista: ASTROPHYSICAL JOURNAL
Volumen: 794
Número: 1
Editorial: UNIV CHICAGO PRESS
Fecha de publicación: 2014
Idioma: English
DOI:

10.1088/0004-637X/794/1/67

Notas: ISI, SCOPUS