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We study the significance of mergers in the quenching of star formation ingalaxies at z~1 by examining their color-mass distributions for differentmorphology types. We perform two-dimensional light profile fits to GOODS izimages of ~5000 galaxies and X-ray selected active galactic nucleus (AGN) hostsin the CANDELS/GOODS-north and south fields in the redshift range 0.7<z<1.3.Distinguishing between bulge-dominated and disk-dominated morphologies, we findthat disks and spheroids have distinct color-mass distributions, in agreementwith studies at z~0. The smooth distribution across colors for the diskgalaxies corresponds to a slow exhaustion of gas, with no fast quenching event.Meanwhile, blue spheroids most likely come from major mergers of star-formingdisk galaxies, and the dearth of spheroids at intermediate green colors issuggestive of rapid quenching. The distribution of moderate luminosity X-rayAGN hosts is even across colors, in contrast, and we find similar numbers anddistributions among the two morphology types with no apparent dependence onEddington ratio. The high fraction of bulge-dominated galaxies that host an AGNin the blue cloud and green valley is consistent with the scenario in which theAGN is triggered after a major merger, and the host galaxy then quickly evolvesinto the green valley. This suggests AGN feedback may play a role in thequenching of star formation in the minority of galaxies that undergo majormergers.

Morphology and the Color-Mass Diagram as Clues to Galaxy Evolution at z~1