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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, I. and Bland-Hawthorn, J. and Brough, S. and Driver, S.P. and Robotham, A.S.G. and Vázquez-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., 445 (2). pp. 2125-2145.


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.

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Publisher statement:This article has been published 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.
Date accepted:08 September 2014
Date deposited:08 April 2016
Date of first online publication:15 October 2014
Date first made open access:No date available

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