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We extend the phenomenological study of the evolving galaxy population ofPeng et al (2010) to the central/satellite dichotomy in Yang et al. SDSSgroups. We find that satellite galaxies are responsible for all theenvironmental effects in our earlier work. The fraction of centrals that arered does not depend on their environment but only on their stellar masses,whereas that of the satellites depends on both. We define a relative satellitequenching efficiency, which is the fraction of blue centrals that are quenchedupon becoming the satellite of another galaxy. This is shown to be independentof stellar mass, but to depend strongly on local overdensity. The red fractionof satellites correlate much better with the local overdensity, a measure oflocation within the group, than with the richness of the group, i.e. darkmatter halo mass. This, and the fact that satellite quenching depends on localdensity and not on either the stellar mass of the galaxy or the halo mass givesclues as to the nature of the satellite-quenching process. We furthermore showthat the action of mass-quenching on satellite galaxies is also independent ofthe DM mass of the parent halo. We then apply the Peng et al (2010) approach topredict the mass functions of central and satellite galaxies, split intopassive and active galaxies, and show that these match very well the observedmass functions from SDSS, further strengthening the validity of thisphenomenological approach. We highlight the fact that the observed M* is thesame for the star-forming centrals and satellites and the observed M* for thestar-forming satellites is independent of halo mass above 10^12M\odot, whichemphasizes the universality of the mass-quenching process that we identified inPeng et al (2010). Post-quenching merging modifies the mass function of thecentral galaxies but can increase the mass of typical centrals by only about25%.

Mass and Environment as Drivers of Galaxy Evolution II: The quenching of satellite galaxies as the origin of environmental effects