Optically Obscured Accretion in z˜0.5 Galaxies

Details Optically Obscured Accretion in z˜0.5 Galaxies Optically Obscured Accretion in z˜0.5 Galaxies

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.117h&link_type=abstract

Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo

Physics

Agn Evolution

Scientific paper

We explore the accretion modes and galaxy properties of X-ray AGN at 0.25 < z < 0.8 that show weak or absent optical signatures (XBONGs), using data from the Bootes 9 deg^2 multiwavelength survey. We derive the average spatial clustering, X-ray spectra, and UV-optical-IR SEDs of these objects as a function of host galaxy parameters. We find evidence for a significant population of highly absorbed X-ray AGN in luminous, strongly clustered galaxies with relatively old stellar populations. These objects may represent a ``maintenance'' phase of X-ray bright accretion that helps prevent star formation in massive red galaxies, as predicted by some galaxy evolution models.

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