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We present the results from a study of the host galaxies of 15 opticallyselected AGNs with 0.5<z<1.1 from GEMS. GEMS is a Hubble Space Telescopeimaging survey of a ~28"x28" contiguous field centered on the Chandra DeepField South in the F606W and F850LP filter bands. It incorporates the SEDs andredshifts of ~10000 objects, obtained by the COMBO-17 project. We have detectedthe host galaxies of all 15 AGNs in the F850LP-band (and 13/15 in theF606W-band), recovering their fluxes, morphologies and structural parameters.We find that 80% of the host galaxies have early-type (bulge-dominated)morphologies, while the rest have structures characteristic of late-type(disk-dominated) galaxies. We find that 25% of the early types, and 30% of thelate types, exhibit disturbances consistent with galaxy interactions. The hostsshow a wide range of colors, from those of red-sequence galaxies to blue colorsconsistent with ongoing star formation. Roughly 70% of the morphologicallyearly-type hosts have rest-frame blue colors, a much larger fraction than thosetypical of non-active morphologically early-type galaxies in this redshift andluminosity range. Yet, we find that the early-type hosts are structurallysimilar to red-sequence ellipticals, inasmuch as they follow an absolutemagnitude versus half-light size correlation that are consistent with the meanrelation for early-type galaxies at similar redshifts

Colors of Active Galactic Nucleus Host Galaxies at 0.5 < z < 1.1 from the GEMS Survey