Environmental dependence of AGN activity and star formation in galaxy clusters from Magneticum simulations

Abstract

(Abridged) Cluster environment has a strong impact on the star formation rate and AGN activity in cluster galaxies. In this work, we investigate the behaviour of different galaxy populations in galaxy clusters and their vicinity by means of cosmological hydrodynamical simulations. We studied galaxies with stellar mass $\log M_{\ast }(M_{\odot })>10.15$ in galaxy clusters with mass $M_{500}>10^{13}{M}_{\odot }$ extracted from box2b (640 comoving Mpc/$h$) of the Magneticum Pathfinder suite of cosmological hydrodynamical simulations at redshifts 0.25 and 0.90. We examined the influence of stellar mass, distance to the nearest neighbouring galaxy, clustercentric radius, substructure membership and large-scale surroundings on the fraction of galaxies hosting an AGN, star formation rate and the ratio between star-forming and quiescent galaxies. We found that in low-mass galaxies, AGN activity and star formation are similarly affected by the environment and decline towards the cluster centre. In massive galaxies, the impact is different; star-formation level increases in the inner regions and peaks between 0.5 and 1 $R_{500}$ with a rapid decline in the centre, whereas AGN activity declines in the inner regions and rapidly rises below $R_{500}$ towards the centre - likely due to stellar mass stripping and the consequent selection of galaxies with more massive black holes. After disentangling the contributions of neighbouring cluster regions, we found an excess of AGN activity in massive galaxies on the cluster outskirts ($\sim 3R_{500}$). We also found that the local density, substructure membership and stellar mass strongly influence star formation and AGN activity but verified that they cannot fully account for the observed radial trends.

arXiv commentPublished in A&A, 14 pages, 12 figures, 1 table

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