2011ApJ...734..121S -
Astrophys. J., 734, 121 (2011/June-3)
Obscured GOODS active galactic nuclei and their host galaxies at z < 1.25: the slow black hole growth phase.
SIMMONS B.D., VAN DUYNE J., URRY C.M., TREISTER E., KOEKEMOER A.M., GROGIN N.A. (The GOODS Team)
Abstract (from CDS):
We compute black hole masses and bolometric luminosities for 87 obscured active galactic nuclei (AGNs) 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 spectral energy distribution (SED) for each active nucleus. We calculate bolometric luminosities for these AGNs by reddening a normalized mean SED of GOODS broad-line AGNs 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, 7x106 M☉ to 6x109 M☉; the median black hole mass is 5x108 M☉. The majority of these AGNs have L/LEdd ≤ 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 AGNs must have occurred at z ≲ 1 and that we are observing these AGNs in a slow- or no-growth state.
Abstract Copyright:
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Journal keyword(s):
galaxies: active - galaxies: bulges - galaxies: fundamental parameters - galaxies: nuclei - galaxies: Seyfert - methods: data analysis
Simbad objects:
89
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