  We present the results from a study of the host galaxies of 15 optically
selected AGNs with 0.5<z<1.1 from GEMS. GEMS is a Hubble Space Telescope
imaging survey of a ~28"x28" contiguous field centered on the Chandra Deep
Field South in the F606W and F850LP filter bands. It incorporates the SEDs and
redshifts of ~10000 objects, obtained by the COMBO-17 project. We have detected
the host galaxies of all 15 AGNs in the F850LP-band (and 13/15 in the
F606W-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 the
late types, exhibit disturbances consistent with galaxy interactions. The hosts
show a wide range of colors, from those of red-sequence galaxies to blue colors
consistent with ongoing star formation. Roughly 70% of the morphologically
early-type hosts have rest-frame blue colors, a much larger fraction than those
typical of non-active morphologically early-type galaxies in this redshift and
luminosity range. Yet, we find that the early-type hosts are structurally
similar to red-sequence ellipticals, inasmuch as they follow an absolute
magnitude versus half-light size correlation that are consistent with the mean
relation for early-type galaxies at similar redshifts.
