Galaxy And Mass Assembly (GAMA): Environment-dependent galaxy stellar mass functions in the low-redshift Universe
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
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2025
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| author | Sbaffoni, A. Liske, J. Driver, S. P. Robotham, A. S. G. Taylor, E. N. |
| author_facet | Sbaffoni, A. Liske, J. Driver, S. P. Robotham, A. S. G. Taylor, E. N. |
| contents | 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: $\log [M^{\star} / (M_{\odot} \, h_{70}^{-2})] = 10.76 \pm 0.01$, $Φ_1^{\star} = (3.75 \pm 0.09) \times 10^{-3}$ Mpc$^{-3}$ $h_{70}^3$, $α_{1} = -0.86 \pm 0.03$, $Φ_2^{\star} = (0.13 \pm 0.05) \times 10^{-3}$ Mpc$^{-3}$ $h_{70}^3$, and $α_{2} = -1.71 \pm 0.06$. This result is consistent with previous GAMA studies in terms of $M^{\star}$, although we find lower values for both $α_{1}$ and $α_{2}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_21363 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Galaxy And Mass Assembly (GAMA): Environment-dependent galaxy stellar mass functions in the low-redshift Universe Sbaffoni, A. Liske, J. Driver, S. P. Robotham, A. S. G. Taylor, E. N. Astrophysics of Galaxies 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: $\log [M^{\star} / (M_{\odot} \, h_{70}^{-2})] = 10.76 \pm 0.01$, $Φ_1^{\star} = (3.75 \pm 0.09) \times 10^{-3}$ Mpc$^{-3}$ $h_{70}^3$, $α_{1} = -0.86 \pm 0.03$, $Φ_2^{\star} = (0.13 \pm 0.05) \times 10^{-3}$ Mpc$^{-3}$ $h_{70}^3$, and $α_{2} = -1.71 \pm 0.06$. This result is consistent with previous GAMA studies in terms of $M^{\star}$, although we find lower values for both $α_{1}$ and $α_{2}$. |
| title | Galaxy And Mass Assembly (GAMA): Environment-dependent galaxy stellar mass functions in the low-redshift Universe |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2503.21363 |