High-Redshift Compton Thick AGN with EXIST

Details High-Redshift Compton Thick AGN with EXIST High-Redshift Compton Thick AGN with EXIST

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21345305t&link_type=abstract

American Astronomical Society, AAS Meeting #213, #453.05; Bulletin of the American Astronomical Society, Vol. 41, p.349

Astronomy and Astrophysics

Astrophysics

Scientific paper

It has been suspected for many years that a large number of heavily obscured, Compton Thick, Active Galactic Nuclei (AGN) should exist at all redshifts, but the exact number of them is still highly uncertain. Recent all-sky surveys with INTEGRAL and Swift are starting to constrain the number of Compton Thick AGN in the local Universe, z<0.1. However, the situation at higher redshifts is much less clear. While a combination of Chandra and Spitzer data have been used recently to find Compton Thick AGN at z 2, those methods are not useful (because of contamination from star-forming galaxies and incompleteness) to find an unbiased sample of Compton Thick sources at 0.5Here, we outline the prospects for finding a large number of Compton Thick AGN at significant redshifts using the planned all-sky EXIST observations. We expect to find a total of 120 Compton Thick AGN at 0.5E.T. gratefully acknowledges the support provided by NASA through Chandra Postdoctoral Fellowship Award Number PF8-90055 issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of NASA under contract NAS8-03060.

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