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Galaxy And Mass Assembly (GAMA) : testing galaxy formation models through the most massive galaxies in the Universe.

Oliva-Altamirano, P. and Brough, S. and Lidman, C. and Couch, W.J. and Hopkins, A.M. and Colless, M. and Taylor, E. and Robotham, A.S.G. and Gunawardhana, M.L.P. and Ponman, T. and Baldry, I. and Bauer, A.E. and Bland-Hawthorn, J. and Cluver, M. and Cameron, E. and Conselice, C.J. and Driver, S. and Edge, A.C. and Graham, A.W. and van Kampen, E. and Lara-López, M.A. and Liske, J. and López-Sánchez, A.R. and Loveday, J. and Mahajan, S. and Peacock, J. and Phillipps, S. and Pimbblet, K.A. and Sharp, R.G. (2014) 'Galaxy And Mass Assembly (GAMA) : testing galaxy formation models through the most massive galaxies in the Universe.', Monthly notices of the Royal Astronomical Society., 440 (1). pp. 762-775.

Abstract

We have analysed the growth of Brightest Group Galaxies and Brightest Cluster Galaxies (BGGs/BCGs) over the last 3 billion years using a large sample of 883 galaxies from the Galaxy And Mass Assembly survey. By comparing the stellar mass of BGGs and BCGs in groups and clusters of similar dynamical masses, we find no significant growth between redshift z = 0.27 and 0.09. We also examine the number of BGGs/BCGs that have line emission, finding that approximately 65 per cent of BGGs/BCGs show Hα in emission. From the galaxies where the necessary spectroscopic lines were accurately recovered (54 per cent of the sample), we find that half of this (i.e. 27 per cent of the sample) harbour ongoing star formation with rates up to 10 M⊙ yr−1, and the other half (i.e. 27 per cent of the sample) have an active nucleus (AGN) at the centre. BGGs are more likely to have ongoing star formation, while BCGs show a higher fraction of AGN activity. By examining the position of the BGGs/BCGs with respect to their host dark matter halo, we find that around 13 per cent of them do not lie at the centre of the dark matter halo. This could be an indicator of recent cluster–cluster mergers. We conclude that BGGs and BCGs acquired their stellar mass rapidly at higher redshifts as predicted by semi-analytic models, mildly slowing down at low redshifts.

Item Type:Article
Keywords:Galaxies: clusters: general, Galaxies: elliptical and lenticular, cD, Galaxies: evolution, Galaxies: groups: general, Galaxies: haloes, Galaxies: star formation.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1093/mnras/stu277
Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2014 The Authors Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:29 July 2014
Date of first online publication:May 2014
Date first made open access:No date available

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