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The AGN dependence on cluster mass

Published online by Cambridge University Press:  07 April 2020

Elias Koulouridis Open the ORCID record for Elias Koulouridis [Opens in a new window] ,
Marina Ricci  and
and the XXL collaboration
Elias Koulouridis
Affiliation:
IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France Univ. Paris Diderot, AIM, Sorbonne Paris Cité, CEA, CNRS, F-91191 Gif-sur-Yvette, France email: ilias.koulouridis@cea.fr
Marina Ricci
Affiliation:
Laboratoire Lagrange, Université Cte dAzur, Observatoire de la Cte dAzur, CNRS, Blvd de l’Observatoire, CS 34229, 06304, Nice cedex 4, France
and the XXL collaboration
Affiliation:
Laboratoire Lagrange, Université Cte dAzur, Observatoire de la Cte dAzur, CNRS, Blvd de l’Observatoire, CS 34229, 06304, Nice cedex 4, France
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Abstract

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We present the results of a study of the AGN density in a homogeneous and well studied sample of 167 bona-fide X-ray galaxy clusters (0.1<z<0.5). Our aim is to study the AGN activity in 167 XXL X-ray galaxy clusters as a function of the cluster mass and the location of the AGN in the cluster. We report a significant AGN excess in our low-mass cluster sub-sample between 0.5r500 and 2r500. In contrast, the high-mass sub-sample presents no AGN excess. The AGN excess in poor clusters indicates AGN triggering, supporting previous studies that reported enhanced galaxy merging in the cluster outskirts. This effect is probably prevented by high velocity dispersions in high-mass clusters. Comparing also with previous studies of massive or high-redshift clusters, we conclude that the AGN fraction in cluster galaxies anti-correlates strongly with cluster mass.

Keywords

galaxies: activegalaxies: Clusters: generalX-rays: galaxies: clustersgalaxies: interactionsgalaxies: evolutioncosmology: large scale structure of Universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S342: Perseus in Sicily: From Black Hole to Cluster Outskirts , May 2018 , pp. 145 - 148
Copyright
© International Astronomical Union 2020

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