Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 445, Issue 2, Pages 2125-2145Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu1886
Keywords
galaxies: evolution; galaxies: luminosity function, mass function; galaxies: structure
Categories
Funding
- European Research Council [DEGAS-259586]
- Royal Society
- Science and Technology Facilities Council [ST/L00075/1]
- BIS National E-infrastructure capital grant [ST/K00042X/1]
- STFC [ST/H008519/1]
- STFC DiRAC [ST/K003267/1]
- Durham University
- STFC [ST/L00075X/1, ST/K00042X/1, ST/F002289/1, ST/I003088/1, ST/L005042/1, ST/J004650/1, ST/H00131X/1, ST/H008578/1, ST/K003577/1, ST/F002300/1, ST/J001465/1, ST/L000652/1, ST/J002291/1, ST/I001166/1, ST/I00162X/1, ST/H008519/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002289/1, ST/H00131X/1, ST/J004650/1, ST/K00042X/1, ST/K003577/1, ST/L00075X/1, ST/F002300/1, ST/L000652/1, ST/J002291/1, ST/L005042/1, ST/H008578/1, ST/I001166/1, ST/J001465/1, ST/H008519/1, ST/I003088/1, ST/I00162X/1] Funding Source: researchfish
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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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