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

Oliva-Altamirano, P., Brough, S., Lidman, C., Couch, W. J., Hopkins, A. M., Colless, M., Taylor, E., Robotham, A. S. G., Gunawardhana, M. L. P., Ponman, T., Baldry, I., Bauer, A. E., Bland-Hawthorn, J., Cluver, M., Cameron, E., Conselice, C. J., Driver, S., Edge, A. C., Graham, A. W., van Kampen, E., Lara-Lopez, M. A., Liske, J., Lopez-Sanchez, A. R., Loveday, J., Mahajan, S., Peacock, J., Phillipps, S., 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: 762-775. doi:10.1093/mnras/stu277


Author Oliva-Altamirano, P.
Brough, S.
Lidman, C.
Couch, W. J.
Hopkins, A. M.
Colless, M.
Taylor, E.
Robotham, A. S. G.
Gunawardhana, M. L. P.
Ponman, T.
Baldry, I.
Bauer, A. E.
Bland-Hawthorn, J.
Cluver, M.
Cameron, E.
Conselice, C. J.
Driver, S.
Edge, A. C.
Graham, A. W.
van Kampen, E.
Lara-Lopez, M. A.
Liske, J.
Lopez-Sanchez, A. R.
Loveday, J.
Mahajan, S.
Peacock, J.
Phillipps, S.
Pimbblet, K. A.
Sharp, R. G.
Title Galaxy and Mass Assembly (GAMA): testing galaxy formation models through the most massive galaxies in the Universe
Journal name Monthly Notices of the Royal Astronomical Society   Check publisher's open access policy
ISSN 1365-2966
0035-8711
Publication date 2014-05-01
Year available 2014
Sub-type Article (original research)
DOI 10.1093/mnras/stu277
Open Access Status DOI
Volume 440
Issue 1
Start page 762
End page 775
Total pages 14
Place of publication Oxford, United Kingdom
Publisher Oxford University Press
Collection year 2015
Language eng
Formatted 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.
Keyword Galaxies: clusters: general
Galaxies: elliptical and lenticular, cD
Galaxies: evolution
Galaxies: groups: general
Galaxies: haloes
Galaxies: star formation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2015 Collection
 
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