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The quenching of star formation in satellite galaxies is observed over a widerange of dark matter halo masses and galaxy environments. In the recent Guo etal (2011) and Fu et al (2013) semi-analytic + N-body models, the gaseousenvironment of the satellite galaxy is governed by the properties of the darkmatter subhalo in which it resides. This quantity depends of the resolution ofthe N-body simulation, leading to a divergent fraction of quenched satellitesin high- and low-resolution simulations. Here, we incorporate an analytic modelto trace the subhaloes below the resolution limit. We demonstrate that we thenobtain better converged results between the Millennium I and II simulations,especially for the satellites in the massive haloes ($\rm logM_{halo}=[14,15]$). We also include a new physical model for the ram-pressurestripping of cold gas in satellite galaxies. However, we find very cleardiscrepancies with observed trends in quenched satellite galaxy fractions as afunction of stellar mass at fixed halo mass. At fixed halo mass, the quenchedfraction of satellites does not depend on stellar mass in the models, butincreases strongly with mass in the data. In addition to the over-prediction oflow-mass passive satellites, the models also predict too few quenched centralgalaxies with low stellar masses, so the problems in reproducing quenchedfractions are not purely of environmental origin. Further improvements to thetreatment of the gas-physical processes regulating the star formation historiesof galaxies are clearly necessary to resolve these problems.

monthly notices of the royal astronomical society

Resolution-independent modeling of environmental effects in  semi-analytic models of galaxy formation that include ram-pressure stripping  of both hot and cold gas