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Triggering active galactic nuclei in galaxy clusters


Marshall, MA and Shabala, SS and Krause, MGH and Pimbblet, KA and Croton, DJ and Owers, MS, Triggering active galactic nuclei in galaxy clusters, Monthly Notices of the Royal Astronomical Society, 474, (3) pp. 3615-3628. ISSN 0035-8711 (2018) [Refereed Article]


Copyright Statement

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.

DOI: doi:10.1093/mnras/stx2996


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 < 2.5 × 10−13 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 Details

Item Type:Refereed Article
Keywords:galaxy formation, galaxy evolution, galaxy clusters, active galaxies
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Cosmology and extragalactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Marshall, MA (Miss Madeline Marshall)
UTAS Author:Shabala, SS (Associate Professor Stas Shabala)
UTAS Author:Krause, MGH (Dr Martin Krause)
ID Code:123651
Year Published:2018
Funding Support:Australian Research Council (DE130101399)
Web of Science® Times Cited:21
Deposited By:Mathematics and Physics
Deposited On:2018-01-16
Last Modified:2019-02-27
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