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The density and masses of obscured Black Holes | | Andrea Comastri
; Fabrizio Fiore
; | | Date: |
2 Apr 2004 | | Journal: | Astrophys.Space Sci. 294 (2004) 63-69 | | Subject: | astro-ph | | Affiliation: | INAF-OABologna), Fabrizio Fiore (INAF-OARoma | | 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. | | Source: | arXiv, astro-ph/0404047 | | Services: | Forum | Review | PDF | Favorites | |
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