Computer Science
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40918a&link_type=abstract
Spitzer Proposal ID #40918
Computer Science
Scientific paper
Deep X-ray surveys have identified large numbers of Active Galctic Nuclei (AGN) in a relatively obscuration-independent manner. However, there is considerable evidence that >50% of luminous AGNs are unidentified in even in the deepest X-ray surveys, most likely due to Compton-thick or near Compton-thick absorption of the intrinsic X-ray emission. These AGNs should be present in deep Spitzer surveys due to thermally reprocessed AGN emission by dust in the absorbing material. Here we propose for Spitzer-IRS spectroscopy of 14 candidate z<1 Compton-thick AGN identified on the basis of 'warm' IR colors from the combination of the ultra-deep Chandra, 24um-MIPS and 70um-MIPS observations in GOODS-N. We will identify AGN activity in these sources from the presence of weak PAH emission, a warm IR continuum, and/or a Si 9.7um absorption feature. These observations will be used to directly quantify the ubiquity of Compton-thick AGN out to z~1, and to assess their contribution to the IR background and ``contamination'' to IR-derived estimates of the star-formation history.
Alexander David
Chary Ranga Ram
Dickinson Mark
Elbaz David
Frayer David
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