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To investigate the role of feedback from Active Galactic Nuclei (AGN) indriving the evolution of their host galaxies, we have carried out a study ofthe environments and optical properties of galaxies harboring X-ray luminousAGN in the Cl1604 supercluster at z~0.9. Making use of Chandra, HST/ACS andKeck/DEIMOS observations, we examine the integrated colors, morphologies andspectral properties of nine moderate-luminosity (L_x ~ 10^43 erg s^-1) type 2Seyferts detected in the Cl1604 complex. We find that the AGN are predominantlyhosted by luminous spheroids and/or bulge dominated galaxies which have colorsthat place them in the valley between the blue cloud and red sequence incolor-magnitude space, consistent with predictions that AGN hosts shouldconstitute a transition population. Half of the hosts have bluer overall colorsas a result of blue resolved cores in otherwise red spheroids and a majorityshow signs of recent or pending interactions. We also find a substantial numberexhibit strong Balmer absorption features indicative of post-starburstgalaxies, despite the fact that we detect narrow [OII] emission lines in all ofthe host spectra. If the [OII] lines are due in part to AGN emission, as wesuspect, then this result implies that a significant fraction of these galaxies(44%) have experienced an enhanced level of star formation within the last ~1Gyr which was rapidly suppressed. Overall we find that the properties of thenine host galaxies are generally consistent with a scenario in which recentinteractions have triggered both increased levels of nuclear activity and anenhancement of centrally concentrated star formation, followed by a rapidtruncation of the latter, possibly as a result of feedback from the AGN itself.[Abridged]

Properties of Galaxies Hosting X-ray Selected Active Galactic Nuclei in the Cl1604 Supercluster at z=0.9