Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344713v&link_type=abstract
American Astronomical Society, AAS Meeting #213, #453.09; Bulletin of the American Astronomical Society, Vol. 41, p.335
Astronomy and Astrophysics
Astronomy
Scientific paper
The 30 keV peak in the X-ray background strongly suggests that there is a large number of highly obscured AGN in the local universe; however, the
number of these objects remains poorly known even though they could constitute a substantial fraction of supermassive black holes. These Compton-thick AGN can be detected in hard X-rays with INTEGRAL. We have carried out a 3 Msec deep INTEGRAL survey of the XMM-LSS field to perform an unbiased search for heavily obscured AGN to get a complete AGN census in the local Universe. We present the first results, including new hard X-ray detections of 14 AGN detected with a source significance of at least 6. We present the 20-200 keV spectra of the brightest AGN, properties of their optical counterparts, AGN number counts in the 20--50 keV band, and highlight some of the science that can be achieved with an even deeper exposure. Surveys like this lay the ground-work for more sensitive surveys to be carried out in the future with planned obsevatories like NuSTAR and EXIST.
Beckmann Volker
Bird T.
Coppi Paolo
Maccarone Thomas
Treister Ezequiel
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