The Density and Masses of Obscured Black Holes |
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| Authors: | Andrea Comastri Fabrizio Fiore |
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| Institution: | (1) INAF, Osservatorio Astronomico di Bologna, Italy;(2) INAF, Osservatorio Astronomico di Roma, Italy |
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| Abstract: | Recent Chandra and XMM-Newton surveys have uncovered a large fraction of the obscured AGN responsible of the hard X-ray background. One of the most intriguing
results of extensive programs of follow-up observations concerns the optical and near-infrared properties of the hard X-ray
sources counterparts. More specifically, for a significant fraction of hard X-ray obscured sources the AGN responsible of
the high X-ray luminosity remains elusive over a wide range of wavelengths from soft X-rays to near-infrared. This very observational
result opens the possibility to investigate the host of bright obscured quasars in some detail. Here we briefly report on
some preliminar results obtained for a small sample of elusive AGN in the HELLAS2XMM survey. |
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| Keywords: | X-ray surveys AGN black holes |
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