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Galaxy And Mass Assembly (GAMA) : the dependence of the galaxy luminosity function on environment, redshift and colour

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Date
01/12/2014
Author
McNaught-Roberts, Tamsyn
Norberg, Peder
Baugh, Carlton
Lacey, Cedric
Loveday, J.
Peacock, J.
Baldry, I.
Bland-Hawthorn, J.
Brough, S.
Driver, Simon P.
Robotham, A. S. G.
Vazquez-Mata, J. A.
Keywords
Galaxies: evolution
Galaxies: luminosity function, mass function
Galaxies: structure
Digital-sky-survey
Cluster galaxies
Special type
Evolution
Density
Catalog
Field
Bimodality
Morphology
Universe
QB Astronomy
QC Physics
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Abstract
We use 80 922 galaxies in the Galaxy And Mass Assembly (GAMA) survey to measure the galaxy luminosity function (LF) in different environments over the redshift range 0.04 <z <0.26. The depth and size of GAMA allows us to define samples split by colour and redshift to measure the dependence of the LF on environment, redshift and colour. We find that the LF varies smoothly with overdensity, consistent with previous results, with little environmental dependent evolution over the last 3 Gyr. The modified GALFORM model predictions agree remarkably well with our LFs split by environment, particularly in the most overdense environments. The LFs predicted by the model for both blue and red galaxies are consistent with GAMA for the environments and luminosities at which such galaxies dominate. Discrepancies between the model and the data seen in the faint end of the LF suggest too many faint red galaxies are predicted, which is likely to be due to the over-quenching of satellite galaxies. The excess of bright blue galaxies predicted in underdense regions could be due to the implementation of AGN feedback not being sufficiently effective in the lower mass haloes.
Citation
McNaught-Roberts , T , Norberg , P , Baugh , C , Lacey , C , Loveday , J , Peacock , J , Baldry , I , Bland-Hawthorn , J , Brough , S , Driver , S P , Robotham , A S G & Vazquez-Mata , J A 2014 , ' Galaxy And Mass Assembly (GAMA) : the dependence of the galaxy luminosity function on environment, redshift and colour ' , Monthly Notices of the Royal Astronomical Society , vol. 445 , no. 2 , pp. 2125-2145 . https://doi.org/10.1093/mnras/stu1886
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
DOI
https://doi.org/10.1093/mnras/stu1886
ISSN
0035-8711
Type
Journal article
Rights
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 the Royal Astronomical Society. All rights reserved.
Description
TMR acknowledges support from a European Research Council Starting Grant (DEGAS-259586). PN acknowledges the support of the Royal Society through the award of a University Research Fellowship and the European Research Council, through receipt of a Starting Grant (DEGAS-259586). This work was supported by the Science and Technology Facilities Council [ST/L00075/1].
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/6022

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