AGN host galaxies at z∼0.4-1.3:: Bulge-dominated and lacking merger-AGN connection

We investigate morphological structure parameters and local environments of distant moderate-luminosity active galactic nucleus (AGN) host galaxies in the overlap between the HST/ACS observations of the Great Observatories Origins Deep Survey (GOODS) and the two Chandra Deep Fields. We compute near-neighbor counts and BViz asymmetry (A) and concentration (C) indices for approximate to 35,500 GOODS/ACS galaxies complete to, including z(850) < 26.6, the resolved hosts of 322 X-ray-selected AGNs. Distributions of (1) z(850) asymmetry for 130 z(850) < 23 AGN hosts and (2) near-neighbor counts for 173 z(850) < 24 AGN hosts are both consistent with non-AGN control samples. This implies no close connection between recent galaxy mergers and moderate-luminosity AGN activity out to appreciable look-back times (z less than or similar to 1.3), approaching the epoch of peak AGN activity in the universe. The distribution of z(850) the AGN hosts is offset by Delta C approximate to +0.5 compared to the non-AGN, a 6.4 sigma discrepancy much larger than can be explained by the possible influence of unresolved emission from the AGN or a circumnuclear starburst. The local universe association between AGN and bulge-dominated galaxies thus persists to substantial look-back time. We discuss implications in the context of the low-redshift supermassive central black hole mass correlation with host galaxy properties, including concentration.