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Mon. Not. R. Astron. Soc. 000, 1–19 (2013) Printed 11 December 2014 (MN LATEX style ?le v2.2) Hot gas in massive halos drives both mass quenching and environment quenching J. M. Gabor,1? R. Dave′2,3,4 1CEA-Saclay, IRFU, SAp, F-91191 Gif-sur-Yvette, France 2University of the Western Cape, Bellville, Cape Town 7535, South Africa 3South African Astronomical Observatories, Observatory, Cape Town 7925, South Africa 4African Institute for Mathematical Sciences, Muizenberg, Cape Town 7945, South Africa 11 December 2014 ABSTRACT Observed galaxies with high stellar masses or in dense environments have low speci?c star formation rates, i.e. they are quenched. Based on cosmological hydrodynamic simulations that include a prescription where quenching occurs in regions dominated by hot ( 105.4 K) gas, 12 we argue that this hot gas quenching in halos 10 Mdrives both mass quenching (i.e. central quenching) and environment quenching (i.e. satellite quenching). These simulations reproduce a broad range of locally observed trends among quenching, halo mass, stellar mass, environment, and distance to halo center. Mass quenching is independent of environment 12 13 because ～ 10 ? 10 M“mass quenching halos” inhabit a large range of environments. On the other hand, environment quenching is independent of stellar mass because galaxies of all stellar masses may live in dense environments as satellites of groups and clusters. As in