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Title: Evidence of a link between the evolution of clusters and their AGN fraction
Authors: Van Breukelen C.
Rawlings, S.
Clewley, L.
Mauch, T.
Simpson, C.
Akiyama, M.
Bonfield, D.
Jarvis, M. J.
Readhead, T.
Stobbart, A-M.
Watson, M.
Swinbank, M.
First Published: 1-May-2009
Citation: Monthly Notices of the Royal Astronomical Society, 2009, 395 (1), pp. 11-27
Abstract: We discuss the optical properties, X-ray detections and active galactic nucleus (AGN) populations of four clusters at z∼ 1 in the Subaru–XMM Deep Field (SXDF). The velocity distribution and plausible extended X-ray detections are examined, as well as the number of X-ray point sources and radio sources associated with the clusters. We find that the two clusters that appear virialized and have an extended X-ray detection contain few, if any, AGN, whereas the two pre-virialized clusters have a large AGN population. This constitutes evidence that the AGN fraction in clusters is linked to the clusters' evolutionary stage. The number of X-ray AGN in the pre-virialized clusters is consistent with an overdensity of a factor of ∼200; the radio AGN appear to be clustered with a factor of 3 to 6 higher. The median K-band luminosities of LK= 1.7 ± 0.7 L* for the X-ray sources and LK= 2.3 ± 0.1 L* for the radio sources support the theory that these AGN are triggered by galaxy interaction and merging events in sub-groups with low internal velocity distributions, which make up the cluster environment in a pre-virialization evolutionary stage.
DOI Link: 10.1111/j.1365-2966.2009.14513.x
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2009 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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