The Dearth of Difference between Central and Satellite Galaxies I.
  Perspectives on star formation quenching and AGN activities
  We investigate the quenching properties of central and satellite galaxies,
utilizing the halo masses and central-satellite identifications from the SDSS
galaxy group catalog of Yang et al. We find that the quenched fractions of
centrals and satellites of similar stellar masses have similar dependence on
host halo mass. The similarity of the two populations is also found in terms of
specific star formation rate and 4000 \AA\ break. The quenched fractions of
centrals and satellites of similar masses show similar dependencies on
bulge-to-total light ratio, central velocity dispersion and halo-centric
distance in halos of given halo masses. The prevalence of optical/radio-loud
AGNs is found to be similar for centrals and satellites at given stellar
masses. All these findings strongly suggest that centrals and satellites of
similar masses experience similar quenching processes in their host halos. We
discuss implications of our results for the understanding of galaxy quenching.
