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We investigate the origin of galaxy bimodality by quantifying the relativerole of intrinsic and environmental drivers to the cessation (or `quenching')of star formation in over half a million local Sloan Digital Sky Survey (SDSS)galaxies. Our sample contains a wide variety of galaxies at z=0.02-0.2, withstellar masses of 8 < log(M*/M_sun) < 12, spanning the entire morphologicalrange from pure disks to spheroids, and over four orders of magnitude in localgalaxy density and halo mass. We utilise published star formation rates and addto this recent GIM2D photometric and stellar mass bulge + disk decompositionsfrom our group. We find that the passive fraction of galaxies increases steeplywith stellar mass, halo mass, and bulge mass, with a less steep dependence onlocal galaxy density and bulge-to-total stellar mass ratio (B/T). At fixedinternal properties, we find that central and satellite galaxies have differentpassive fraction relationships. For centrals, we conclude that there is lessvariation in the passive fraction at a fixed bulge mass, than for any othervariable, including total stellar mass, halo mass, and B/T. This implies thatthe quenching mechanism must be most tightly coupled to the bulge. We arguethat radio-mode AGN feedback offers the most plausible explanation of theobserved trends.

Bulge mass is king: The dominant role of the bulge in determining the fraction of passive galaxies in the Sloan Digital Sky Survey