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The dependence of cluster galaxy properties on the central entropy of their host cluster.

Kim, Jae-Woo and Ko, Jongwan and Hwang, Ho Seong and Edge, Alastair C. and Lee, Joon Hyeop and Lee, Jong Chul and Jeong, Hyunjin (2017) 'The dependence of cluster galaxy properties on the central entropy of their host cluster.', Astrophysical journal., 836 (1). p. 105.

Abstract

We present a study of the connection between brightest cluster galaxies (BCGs) and their host galaxy clusters. Using galaxy clusters at $0.1\lt z\lt 0.3$ from the Hectospec Cluster Survey (HeCS) with X-ray information from the Archive of Chandra Cluster Entropy Profile Tables (ACCEPT), we confirm that BCGs in low central entropy clusters are well aligned with the X-ray center. Additionally, the magnitude difference between BCG and the second brightest galaxy also correlates with the central entropy of the intracluster medium. From the red-sequence (RS) galaxies, we cannot find significant dependence of RS color scatter and stellar population on the central entropy of the intracluster medium of their host cluster. However, BCGs in low-entropy clusters are systematically less massive than those in high-entropy clusters, although this is dependent on the method used to derive the stellar mass of BCGs. In contrast, the stellar velocity dispersion of BCGs shows no dependence on BCG activity and cluster central entropy. This implies that the potential of the BCG is established earlier and the activity leading to optical emission lines is dictated by the properties of the intracluster medium in the cluster core.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:https://doi.org/10.3847/1538-4357/aa5b8e
Publisher statement:© 2017. The American Astronomical Society. All rights reserved.
Date accepted:20 January 2017
Date deposited:03 May 2017
Date of first online publication:13 February 2017
Date first made open access:03 May 2017

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