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- Title
The Density and Masses of Obscured Black Holes.
- Authors
Comastri, Andrea; Fiore, Fabrizio
- Abstract
RecentChandraand XMM-Newtonsurveys 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.
- Subjects
SUPERMASSIVE black holes; ACTIVE galactic nuclei; GRAVITATIONAL collapse; COSMIC rays; RADIO sources (Astronomy); ASTROPHYSICS
- Publication
Astrophysics & Space Science, 2004, Vol 294, Issue 1/2, p63
- ISSN
0004-640X
- Publication type
Article
- DOI
10.1007/s10509-004-4023-5