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Abstract

We model the triggering of active galactic nuclei (AGN) in galaxy clusters using the semi-analytic galaxy formation model SAGE. We prescribe triggering methods based on the ram pressure galaxies experience as they move throughout the intracluster medium, which is hypothesized to trigger star formation and AGN activity. The clustercentric radius and velocity distribution of the simulated active galaxies produced by these models are compared with those of AGN and galaxies with intense star formation from a sample of low-redshift relaxed clusters from the Sloan Digital Sky Survey. The ram pressure triggering model that best explains the clustercentric radius and velocity distribution of these observed galaxies has AGN and star formation triggered if 2.5 × 10−14 Pa Pram −13 Pa and Pram > 2Pinternal; this is consistent with expectations from hydrodynamical simulations of ram-pressure-induced star formation. Our results show that ram pressure is likely to be an important mechanism for triggering star formation and AGN activity in clusters.

Item Type:	Article
Authors/Creators:	Marshall, MA and Shabala, SS and Krause, MGH and Pimbblet, KA and Croton, DJ and Owers, MS
Keywords:	galaxy formation, galaxy evolution, galaxy clusters, active galaxies
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Blackwell Publishing Ltd
ISSN:	0035-8711
DOI / ID Number:	https://doi.org/10.1093/mnras/stx2996
Copyright Information:	This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Related URLs:	Google Scholar: Shabala, SS UTAS Profile: Shabala, SS
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