A Detailed Study of Low Eddington Ratio AGN

Details A Detailed Study of Low Eddington Ratio AGN A Detailed Study of Low Eddington Ratio AGN

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21910902t&link_type=abstract

American Astronomical Society, AAS Meeting #219, #109.02

Astronomy and Astrophysics

Astronomy

Scientific paper

Understanding low Eddington ratio AGN will help us develop a more complete framework for the different modes of AGN accretion (e.g., `quenching’ vs. `maintenance'-mode) and their effects on host galaxy evolution. We use the unprecedented sensitivity of the 4Ms CDF-S to conduct a detailed study of the X-ray spectra of low Eddington ratio AGN. Using these extremely deep exposures, we measure individual spectra for the brightest sources, and for the fainter sources we use a stacking analysis of the X-ray spectra to measure the average spectra for different subsets. We will discuss the properties (star-formation rate, bulge mass, radio loudness, clustering, and optical emission line widths) of the subsets we find to have relatively low Eddington ratios (Lbol/LEdd<10-2), and hard and unabsorbed X-ray spectra. These objects may represent a radiatively inefficient accretion mode such as found in the "low-hard” state for black hole X-ray binaries.

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