2024/02/17 by Yoshiki Toba, Aoi Hashiguchi, Toba, Yoshiki +37
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE) #Scientific Research and Discoveries
paper · pdf · doi:10.48550/arxiv.2402.11188
openalex publication_date 2024/02/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Herein, we present the statistical properties of active galactic nuclei (AGNs) for approximately 1 million member galaxies of galaxy groups and clusters, with 0.1 < cluster redshift (z\rm cl) < 1.4, selected using Subaru Hyper Suprime-Cam, the so-called CAMIRA clusters. In this research, we focused on the AGN power fraction (f\rm AGN), which is defined as the proportion of the contribution of AGNs to the total infrared (IR) luminosity, L\rm IR (AGN)/L\rm IR, and examined how f\rm AGN depends on (i) z\rm cl and (ii) the distance from the cluster center. We compiled multiwavelength data using the ultraviolet--mid-IR range. Moreover, we performed spectral energy distribution fits to determine f\rm AGN using the CIGALE code with the SKIRTOR AGN model. We found that (i) the value of f\rm AGN in the CAMIRA clusters is positively correlated with z\rm cl, with the correlation slope being steeper than that for field galaxies, and (ii) f\rm AGN exhibits a high value at the cluster outskirts. These results indicate that the emergence of AGN population depends on the redshift and environment and that galaxy groups and clusters at high redshifts are important in AGN evolution. Additionally, we demonstrated that cluster--cluster mergers may enhance AGN activity at the outskirts of particularly massive galaxy clusters. Our findings are consistent with a related study on the CAMIRA clusters that was based on the AGN number fraction.