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Session: Extragalactic Astronomy and Astrophysics

Name: Ms. Eleftheria Drigga (NOA, AUTH)
Coauthors: No coauthors were included.
Type: Oral
Title: Properties and Evolution of Active Galactic Nuclei in Galaxy Clusters
Abstract:

There is compelling evidence that the presence of AGN is closely linked to the large-scale environment, and that AGN in clusters are strongly affected by their environment, albeit in a complicated way. As the most massive self-gravitating entities of the universe, clusters are ideal laboratories to investigate the impact of dense environments on AGN demographics. The AGN fraction in cluster galaxies was found to depend on the distance from the cluster centre, the mass of the cluster and the redshift. Interestingly, in contrast to the lack of AGN in the centres of massive clusters, a number of studies have found an excess of X-ray detected AGN in cluster outskirts, supporting the presence of an in-falling population. Several studies have suggested that these observational results are due to ram pressure stripping by the hot ICM, galaxy mergers and interactions, which may play an important role in AGN triggering and evolution. In this talk, I will focus on recent results from the XXL survey and other X-ray or SZ selected cluster samples that span a wide redshift range. These results provide observational evidence of the physical mechanisms that drive AGN and galaxy evolution within clusters.