2023/09/05 by Aoi Hashiguchi, Hashiguchi, Aoi, Yoshiki Toba +43
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #High Energy Astrophysical Phenomena (astro-ph.HE) #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.2309.01926
openalex publication_date 2023/09/05 · openalex created_date 2023/09/11 · openalex updated_date 2026/08/01
One of the key questions on active galactic nuclei (AGN) in galaxy clusters is how AGN could affect the formation and evolution of member galaxies and galaxy clusters in the history of the Universe. To address this issue, we investigate the dependence of AGN number fraction (f\rm AGN) on cluster redshift (z\rm cl) and distance from the cluster center (R/R\rm 200). We focus on more than 27,000 galaxy groups and clusters at 0.1 < z\rm cl < 1.4 with more than 1 million member galaxies selected from the Subaru Hyper Suprime-Cam. By combining various AGN selection methods based on infrared (IR), radio, and X-ray data, we identify 2,688 AGN. We find that (i) f\rm AGN increases with z\rm cl and (ii) f\rm AGN decreases with R/R\rm 200. The main contributors to the rapid increase of f\rm AGN towards high-z and cluster center are IR- and radio-selected AGN, respectively. Those results indicate that the emergence of the AGN population depends on the environment and redshift, and galaxy groups and clusters at high-z play an important role in AGN evolution. We also find that cluster-cluster mergers may not drive AGN activity in at least the cluster center, while we have tentative evidence that cluster-cluster mergers would enhance AGN activity in the outskirts of (particularly massive) galaxy clusters.