AGN Activity in Brigtest Cluster Galaxies (BCGs)

Abstract

The aim of our study is to classify the Brightest Cluster Galaxies (BCG), which are the brightest and most massive galaxies in the universe and to determine fraction of BCGs showing AGN activity. Within the scope of the study, we combine BCGs from galaxy cluster catalogs which presented by Hao et al. (2010) and Wen et al. (2009) constructed from the SDSS (Sloan Digital Sky Survey) data and BCGs identified from CFHTLS (Canada-France-Hawaii Telescope Legacy Survey) Deep fields (Alis, 2009). Our combined sample contains 42490 BCGs. We determine activity types of BCGs by means of BPT diagrams and WISE color-color diagrams. 140 BCGs show AGN activity out of 42490. In addition, we calculated star formation rates (SFR) by using Hα emission lines for 5569 BCGs with suitable spectral data and investigated the correlation between SFR and redshift.