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

McNaught-Roberts, T and Norberg, P and Baugh, C and Lacey, C and Loveday, J and Peacock, J and Baldry, IK and Bland-Hawthorn, J and Brough, S and Driver, SP and Robotham, ASG and Vazquez-Mata, JA (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, 445 (2). pp. 2125-2145. ISSN 0035-8711

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Abstract

We use 80922 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 Gyrs. 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 halos.

Item Type: Article
Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record "Galaxy And Mass Assembly (GAMA): the dependence of the galaxy luminosity function on environment, redshift and colour", MNRAS, 445(2), pp.2125-2145 is available online at:http://dx.doi.org/10.1093/mnras/stu1886
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: OXFORD UNIV PRESS
Related URLs:
Date Deposited: 06 Jul 2015 11:33
Last Modified: 07 Sep 2017 01:53
DOI or Identification number: 10.1093/mnras/stu1886
URI: http://researchonline.ljmu.ac.uk/id/eprint/1521

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