The influence of environment on satellite galaxies in the GAEA semi-analytic model
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The influence of environment on satellite galaxies in the GAEA semi-analytic model. / Xie, Lizhi; De Lucia, Gabriella; Hirschmann, Michaela; Fontanot, Fabio.
In: Monthly Notices of the Royal Astronomical Society, Vol. 498, No. 3, 24.08.2020, p. 4327-4344.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The influence of environment on satellite galaxies in the GAEA semi-analytic model
AU - Xie, Lizhi
AU - De Lucia, Gabriella
AU - Hirschmann, Michaela
AU - Fontanot, Fabio
PY - 2020/8/24
Y1 - 2020/8/24
N2 - Reproducing the observed quenched fraction of satellite galaxies has been a long-standing issue for galaxy formation models. We modify the treatment of environmental effects in our state-of-the-art GAlaxy Evolution and Assembly (GAEA) semi-analytic model to improve our modelling of satellite galaxies. Specifically, we implement gradual stripping of hot gas, ram-pressure stripping of cold gas, and an updated algorithm to account for angular momentum exchanges between the gaseous and stellar disc components of model galaxies. Our updated model predicts quenched fractions that are in good agreement with local observational measurements for central and satellite galaxies, and their dependencies on stellar mass and halo mass. We also find consistency between model predictions and observational estimates of quenching times for satellite galaxies, H I, H-2 fractions of central galaxies, and deficiencies of H I, H-2, SFR of galaxies in cluster haloes. In the framework of our updated model, the dominant quenching mechanisms are hot gas stripping for low-mass satellite galaxies, and AGN feedback for massive satellite galaxies. The ram-pressure stripping of cold gas only affects the quenched fraction in massive haloes with M-h > 10(13.5) M-circle dot, but is needed to reproduce the observed H I deficiencies.
AB - Reproducing the observed quenched fraction of satellite galaxies has been a long-standing issue for galaxy formation models. We modify the treatment of environmental effects in our state-of-the-art GAlaxy Evolution and Assembly (GAEA) semi-analytic model to improve our modelling of satellite galaxies. Specifically, we implement gradual stripping of hot gas, ram-pressure stripping of cold gas, and an updated algorithm to account for angular momentum exchanges between the gaseous and stellar disc components of model galaxies. Our updated model predicts quenched fractions that are in good agreement with local observational measurements for central and satellite galaxies, and their dependencies on stellar mass and halo mass. We also find consistency between model predictions and observational estimates of quenching times for satellite galaxies, H I, H-2 fractions of central galaxies, and deficiencies of H I, H-2, SFR of galaxies in cluster haloes. In the framework of our updated model, the dominant quenching mechanisms are hot gas stripping for low-mass satellite galaxies, and AGN feedback for massive satellite galaxies. The ram-pressure stripping of cold gas only affects the quenched fraction in massive haloes with M-h > 10(13.5) M-circle dot, but is needed to reproduce the observed H I deficiencies.
KW - methods: numerical
KW - galaxies: evolution
KW - galaxies: haloes
KW - galaxies: star formation
KW - QUENCHING TIME-SCALES
KW - COLD DARK-MATTER
KW - STAR-FORMATION
KW - HIERARCHICAL-MODELS
KW - MOLECULAR-HYDROGEN
KW - CLUSTER GALAXIES
KW - STELLAR FEEDBACK
KW - ANGULAR-MOMENTUM
KW - DWARF GALAXIES
KW - GAS DEFICIENCY
U2 - 10.1093/mnras/staa2370
DO - 10.1093/mnras/staa2370
M3 - Journal article
VL - 498
SP - 4327
EP - 4344
JO - Royal Astronomical Society. Monthly Notices
JF - Royal Astronomical Society. Monthly Notices
SN - 0035-8711
IS - 3
ER -
ID: 252293037