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

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: $ \log [M^{\star} / (M_{\odot}\,h_{70}^{-2})] = 10.76 \pm 0.01 $, Φ1⋆ = (3.75 ± 0.09)×10−3 Mpc−3 h703, α1 = −0.86 ± 0.03, Φ2⋆ = (0.13 ± 0.05)×10−3 Mpc−3 h703, and α2 = −1.71 ± 0.06. This result is consistent with previous GAMA studies in terms of M⋆, although we find lower values for both α1 and α2.