The Dependence of Cluster Galaxy Properties on the Central Entropy of Their Host Cluster

Kim, Jae-Woo; Ko, Jongwan; Hwang, Ho Seong; Edge, Alastair C.; Lee, Joon Hyeop; Lee, Jong Chul; Jeong, Hyunjin

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.

Citation

Kim, J., Ko, J., Hwang, H. S., Edge, A. C., Lee, J. H., Lee, J. C., & Jeong, H. (2017). The Dependence of Cluster Galaxy Properties on the Central Entropy of Their Host Cluster. Astrophysical Journal, 836(1), Article 105. https://doi.org/10.3847/1538-4357/aa5b8e

• Journal Article Type: Article
• Acceptance Date: Jan 20, 2017
• Online Publication Date: Feb 13, 2017
• Publication Date: Feb 13, 2017
• Deposit Date: Apr 28, 2017
• Publicly Available Date: May 3, 2017
• Journal: Astrophysical Journal
• Print ISSN: 0004-637X
• Electronic ISSN: 1538-4357
• Publisher: American Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 836
• Issue: 1
• Article Number: 105
• DOI: https://doi.org/10.3847/1538-4357/aa5b8e
• Public URL: https://durham-repository.worktribe.com/output/1388614
• Related Public URLs: arxiv.org/pdf/1703.02234.pdf