2025/03/27 by A. Sbaffoni, Sbaffoni, A., J. Liske +7
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.2503.21363
openalex publication_date 2025/03/27 · openalex created_date 2025/10/11 · openalex updated_date 2026/07/28
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\odot h70-2)] = 10.76 ± 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.