  We use HST/ACS images and a photometric catalog of the COSMOS field to
analyze morphologies of the host galaxies of approximately 400 AGN candidates
at redshifts 0.3 < z < 1.0. We compare the AGN hosts with a sample of
non-active galaxies drawn from the COSMOS field to match the magnitude and
redshift distribution of the AGN hosts. We perform 2-D surface brightness
modeling with GALFIT to yield host galaxy and nuclear point source magnitudes.
X-ray selected AGN host galaxy morphologies span a substantial range that peaks
between those of early-type, bulge-dominated and late-type, disk-dominated
systems. We also measure the asymmetry and concentration of the host galaxies.
Unaccounted for, the nuclear point source can significantly bias results of
these measured structural parameters, so we subtract the best-fit point source
component to obtain images of the underlying host galaxies. Our concentration
measurements reinforce the findings of our 2-D morphology fits, placing X-ray
AGN hosts between early- and late-type inactive galaxies. AGN host asymmetry
distributions are consistent with those of control galaxies. Combined with a
lack of excess companion galaxies around AGN, the asymmetry distributions
indicate that strong interactions are no more prevalent among AGN than normal
galaxies. In light of recent work, these results suggest that the host galaxies
of AGN at these X-ray luminosities may be in a transition from disk-dominated
to bulge-dominated, but that this transition is not typically triggered by
major mergers.
