The History of Black Hole Accretion from X-ray Stacking

Details The History of Black Hole Accretion from X-ray Stacking The History of Black Hole Accretion from X-ray Stacking

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21732601t&link_type=abstract

American Astronomical Society, AAS Meeting #217, #326.01; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We take advantage of the rich multi-wavelength data available in the Chandra Deep Field South (CDF-S), including the 4 Msec Chandra observations (the deepest X-ray data to date), in order to search for heavily-obscured low-luminosity AGN among infrared-luminous galaxies. We obtained a stacked rest-frame X-ray spectrum for samples of galaxies binned in terms of their IR luminosity. We detect a significant signal at E 1 to 8 keV, which we interpret as originating from a combination of emission associated with star-formation processes at low energies and heavily-obscured AGN at E>5 keV. We further find that the relative strength of this AGN signal decays with decreasing IR luminosity, indicating a higher AGN fraction for more luminous IR sources. The integrated intensity at high energies indicates that a significant fraction of the total black hole growth, 22%, occurs in heavily-obscured systems that are not individually detected in even the deepest X-ray observations.
E.T. gratefully acknowledges the support provided by NASA through Chandra Postdoctoral Fellowship Award Number PF8-90055 issued by the Chandra X-ray Observatory Center, and NASA/Suzaku grant NNX09AV62G.

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