Obscured GOODS AGN and Their Host Galaxies at z < 1.25: The Slow Black
  Hole Growth Phase
  We compute black hole masses and bolometric luminosities for 87 obscured AGN
in the redshift range 0.25 < z < 1.25, selected from the GOODS deep
multi-wavelength survey fields via their X-ray emission. We fit the optical
images and obtain morphological parameters for the host galaxy, separating the
galaxy from its central point source, thereby obtaining a four-band optical SED
for each active nucleus. We calculate bolometric luminosities for these AGN by
reddening a normalized mean SED of GOODS broad-line AGN to match the observed
central point-source SED of each obscured AGN. This estimate of Lbol has a
smaller spread than simple bolometric corrections to the X-ray luminosity or
direct integration of the observed multi-wavelength SED, suggesting it is a
better measure. We estimate central black hole masses from the bulge
luminosities. The black hole masses span a wide range, 7 x 10^6 M_sun to 6 x
10^9 M_sun; the median black hole mass is 5 x 10^8 M_sun. The majority of these
AGN have L/L_Edd < 0.01, and we detect no significant evolution of the mean
Eddington ratio to z = 1.25. This implies that the bulk of black hole growth in
these obscured AGN must have occurred at z > 1 and that we are observing these
AGN in a slow- or no-growth state.
