Paper

Galaxy And Mass Assembly (GAMA): Environment-dependent galaxy stellar mass functions in the low-redshift Universe

Liske, J, Taylor, E N, Sbaffoni, A, Robotham, A S G, Driver, S P

2025

Overview

From a carefully selected sample of \\(52\\,089\\) galaxies and \\(10\\,429\\) groups, we investigate the variation of the low-redshift galaxy stellar mass function (GSMF) in the equatorial Galaxy And Mass Assembly (GAMA) dataset as a function of four different environmental properties. We find that: (i) The GSMF is not strongly affected by distance to the nearest filament but rather by group membership. (ii) More massive halos tend to host more massive galaxies and exhibit a steeper decline with stellar mass in the number of intermediate-mass galaxies. This result is robust against the choice of dynamical and luminosity-based group halo mass estimates. (iii) The GSMF of group galaxies does not depend on the position within a filament, but for groups outside of filaments, the characteristic mass of the GSMF is lower. Finally, our global GSMF is well described by a double Schechter function with the following parameters: \\( [M^ / (M_ \\, h_70^-2)] = 10.76 0.01\\), \\(_1^ = (3.75 0.09) 10^-3\\) Mpc\\(^-3\\) \\(h_70^3\\), \\(_1 = -0.86 0.03\\), \\(_2^ = (0.13 0.05) 10^-3\\) Mpc\\(^-3\\) \\(h_70^3\\), and \\(_2 = -1.71 0.06\\). This result is consistent with previous GAMA studies in terms of \\(M^\\), although we find lower values for both \\(_1\\) and \\(_2\\).

• Publisher: Cornell University Library, arXiv.org
• Subject: Filaments / Galactic halos / Galaxies / Luminosity / Red shift / Stars & galaxies / Stellar mass