Probing The Slow-growth Phase Of AGN At z 1 In GOODS

Details Probing The Slow-growth Phase Of AGN At z 1 In GOODS Probing The Slow-growth Phase Of AGN At z 1 In GOODS

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.3518s&link_type=abstract

American Astronomical Society, HEAD meeting #12, #35.18

Astronomy and Astrophysics

Astronomy

Scientific paper

Using a new method for calculating bolometric luminosities, we examine the Eddington ratios of a sample of 87 X-ray-selected obscured AGN in the GOODS fields. Estimating black hole masses using host bulge luminosities, we find that the black holes in the sample span three orders of magnitude in mass, from 4e6 to 6e9 solar masses (median value 6e8). The majority of these AGN have Eddington ratios below 1%, and we detect no evolution in the mean Eddington ratio out 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 them in a slow- or no-growth state.
Our bolometric luminosities, based on dust-corrected central point-source SEDs, have a smaller spread than do alternative estimates from corrections to the X-ray luminosity or direct SED integration, suggesting our new method yields a better measure of bolometric luminosity; these values also agree with theoretical models of AGN luminosity based on a unification scenario.

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