6 research outputs found
Global distribution and surface activity of macromolecules in offline simulations of marine organic chemistry
AGN host galaxies at z similar to 0.4-1.3: Bulge-dominated and lackingmerger-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 ~35,500
GOODS/ACS galaxies complete to z_850 ~ 26.6, including the resolved hosts of
322 X-ray-selected AGNs. Distributions of (1) z_850 asymmetry for 130 AGN hosts
at z_850 < 23 and (2) near-neighbor counts for 173 AGN hosts at z_850 < 24 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 < 1.3), approaching the epoch of peak AGN
activity in the universe. The distribution of z_850 concentrations for the AGN
hosts is offset by +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.Comment: Astrophysical Journal Letters, in press. Figure 1 available at full
resolution upon reques
The Hubble higher z supernova search: Supernovae to z ~ 1.6 and constraints on type Ia progenitor models
Erratum for the article 2004 ApJ 613 20