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*=(M⊙ h-2 70 )] = 10:76± 0:01, Φ*1 = (3:75± 0:09)×10-3 Mpc-3 h3 70, α1 = -0:86± 0:03, Φ*2 = (0:13± 0:05) ×10-3 Mpc-3 h3 70, 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.