case western reserve university



Active Galactic Nuclei in Clusters of Galaxies

Paul Martini (OSU)

AGN in clusters of galaxies are commonly invoked to explain the absence of cold gas in cluster cores and the presence of giant cavities in the hot intracluster medium. Yet although AGN appear to play significant roles in clusters, they appear to be substantially rarer in rich environments than in the lower-density field. I will present results from a sensitive and comprehensive survey of eight low-redshift clusters that has spectroscopically-confirmed the presence of a large AGN population. This survey has systematically quantified the AGN population in clusters for the first time and discovered five times as many AGN in clusters as expected from previous work. I will describe the spatial, kinematic, and host galaxy types of these cluster AGN and discuss their implications for cluster galaxy evolution and heating the intracluster medium.