Galaxy And Mass Assembly (GAMA): Deconstructing the galaxy stellar mass function by star formation and environment

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Bibliographic Details
Main Authors:	Sbaffoni, A., Liske, J., Robotham, A. S. G., Davies, L. J. M., Driver, S. P., Taylor, E. N.
Format:	Preprint
Published:	2025
Subjects:	Astrophysics of Galaxies
Online Access:	Acceder al recurso
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author	Sbaffoni, A. Liske, J. Robotham, A. S. G. Davies, L. J. M. Driver, S. P. Taylor, E. N.
author_facet	Sbaffoni, A. Liske, J. Robotham, A. S. G. Davies, L. J. M. Driver, S. P. Taylor, E. N.
contents	Using the equatorial Galaxy and Mass Assembly (GAMA) dataset, we investigate how the low-redshift galaxy stellar mass function (GSMF) varies across different galaxy populations and as a function of halo mass. We find that: (i) The GSMF of passive and star-forming galaxies are well described by a double and a single Schechter function, respectively, although the inclusion of a second component for the star-forming population yields a more accurate description. Furthermore, star-forming galaxies dominate the low-mass end of the total GSMF, whereas passive galaxies mainly shape the intermediate-to-high-mass regime. (ii) The GSMF of central galaxies dominates the high-mass end, whereas satellites and ungrouped galaxies shape the intermediate-to-low-mass regime. Additionally, we find a relative increase in the abundance of low-mass galaxies moving from dense group environments to isolated systems. (iii) More massive halos host more massive galaxies, have a higher fraction of passive systems, and show a steeper decline in the number of intermediate-mass galaxies. Finally, our results reveal larger differences between passive and star-forming GSMFs than predicted by a phenomenological quenching model, but generally confirm the environmental quenching trends for centrals and satellites reported in other works.
format	Preprint
id	arxiv_https___arxiv_org_abs_2512_19310
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Galaxy And Mass Assembly (GAMA): Deconstructing the galaxy stellar mass function by star formation and environment Sbaffoni, A. Liske, J. Robotham, A. S. G. Davies, L. J. M. Driver, S. P. Taylor, E. N. Astrophysics of Galaxies Using the equatorial Galaxy and Mass Assembly (GAMA) dataset, we investigate how the low-redshift galaxy stellar mass function (GSMF) varies across different galaxy populations and as a function of halo mass. We find that: (i) The GSMF of passive and star-forming galaxies are well described by a double and a single Schechter function, respectively, although the inclusion of a second component for the star-forming population yields a more accurate description. Furthermore, star-forming galaxies dominate the low-mass end of the total GSMF, whereas passive galaxies mainly shape the intermediate-to-high-mass regime. (ii) The GSMF of central galaxies dominates the high-mass end, whereas satellites and ungrouped galaxies shape the intermediate-to-low-mass regime. Additionally, we find a relative increase in the abundance of low-mass galaxies moving from dense group environments to isolated systems. (iii) More massive halos host more massive galaxies, have a higher fraction of passive systems, and show a steeper decline in the number of intermediate-mass galaxies. Finally, our results reveal larger differences between passive and star-forming GSMFs than predicted by a phenomenological quenching model, but generally confirm the environmental quenching trends for centrals and satellites reported in other works.
title	Galaxy And Mass Assembly (GAMA): Deconstructing the galaxy stellar mass function by star formation and environment
topic	Astrophysics of Galaxies
url	https://arxiv.org/abs/2512.19310