# Galaxy and Mass Assembly: luminosity and stellar mass functions in GAMA groups

Vázquez-Mata, JA, Loveday, J, Riggs, SD, Baldry, IK, Davies, LJM, Robotham, ASG, Holwerda, BW, Brown, MJI, Cluver, ME, Wang, L, Alpaslan, M, Bland-Hawthorn, J, Brough, S, Driver, SP, Hopkins, AM, Taylor, EN and Wright, AH (2020) Galaxy and Mass Assembly: luminosity and stellar mass functions in GAMA groups. Monthly Notices of the Royal Astronomical Society, 499 (1). pp. 631-652. ISSN 0035-8711

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## Abstract

How do galaxy properties (such as stellar mass, luminosity, star formation rate, and morphology) and their evolution depend on the mass of their host dark matter halo? Using the Galaxy and Mass Assembly (GAMA) group catalogue, we address this question by exploring the dependence on host halo mass of the luminosity function (LF) and stellar mass function (SMF) for grouped galaxies subdivided by colour, morphology and central/satellite. We find that spheroidal galaxies in particular dominate the bright and massive ends of the LF and SMF, respectively. More massive haloes host more massive and more luminous central galaxies. The satellite LF and SMF respectively show a systematic brightening of characteristic magnitude, and increase in characteristic mass, with increasing halo mass. In contrast to some previous results, the faint-end and low-mass slopes show little systematic dependence on halo mass. Semi-analytic models and simulations show similar or enhanced dependence of central mass and luminosity on halo mass. Faint and low-mass simulated satellite galaxies are remarkably independent of halo mass, but the most massive satellites are more common in more massive groups. In the first investigation of low-redshift LF and SMF evolution in group environments, we find that the red/blue ratio of galaxies in groups has increased since redshift \$z \approx 0.3\$ relative to the field population. This observation strongly suggests that quenching of star formation in galaxies as they are accreted into galaxy groups is a significant and ongoing process.

Item Type: Article This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. astro-ph.GA; astro-ph.GA Q Science > QB AstronomyQ Science > QC Physics Astrophysics Research Institute Oxford University Press Author 09 Oct 2020 09:36 05 Jan 2022 13:15 https://researchonline.ljmu.ac.uk/id/eprint/13812

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