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A comprehensive study of the radio properties of brightest cluster galaxies.

Hogan, M.T. and Edge, A.C. and Hlavacek-Larrondo, J. and Grainge, K.J.B. and Hamer, S.L. and Mahony, E.K. and Russell, H.R. and Fabian, A.C. and McNamara, B.R. and Wilman, R.J. (2015) 'A comprehensive study of the radio properties of brightest cluster galaxies.', Monthly notices of the Royal Astronomical Society., 453 (2). pp. 1201-1222.


We examine the radio properties of the brightest cluster galaxies (BCGs) in a large sample of X-ray selected galaxy clusters comprising the Brightest Cluster Sample (BCS), the extended BCS and ROSAT-ESO Flux Limited X-ray cluster catalogues. We have multifrequency radio observations of the BCG using a variety of data from the Australia Telescope Compact Array, Jansky Very Large Array and Very Long Baseline Array telescopes. The radio spectral energy distributions of these objects are decomposed into a component attributed to on-going accretion by the active galactic nuclei (AGN) that we refer to as ‘the core’, and a more diffuse, ageing component we refer to as the ‘non-core’. These BCGs are matched to previous studies to determine whether they exhibit emission lines (principally Hα), indicative of the presence of a strong cooling cluster core. We consider how the radio properties of the BCGs vary with cluster environmental factors. Line emitting BCGs are shown to generally host more powerful radio sources, exhibiting the presence of a strong, distinguishable core component in about 60 per cent of cases. This core component more strongly correlates with the BCG's [O III] 5007 Å line emission. For BCGs in line emitting clusters, the X-ray cavity power correlates with both the extended and core radio emission, suggestive of steady fuelling of the AGN over bubble-rise time-scales in these clusters.

Item Type:Article
Keywords:Galaxies: clusters: general, Galaxies: jets, Radio continuum: galaxies.
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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:07 July 2015
Date deposited:04 November 2015
Date of first online publication:24 August 2015
Date first made open access:No date available

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