The BeppoSAX view of the hard X-ray background
arXiv:astro-ph/9902060 · doi:10.1016/S0273-1177(99)00850-9
Abstract
First results on a medium-deep X-ray survey in the "new" 5-10 keV band carried out with the MECS detectors onboard BeppoSAX are presented. The High Energy Llarge Area Survey (HELLAS) is aimed to directly explore a band where the energy density of the X-ray background is more than twice than that in the soft (0.5-2.0 keV) band. The optical identification follow-up of the first ten HELLAS hard X-ray sources indicate that Active Galactic Nuclei are the dominant population at 5-10 keV fluxes of the order of 10e-13 cgs. We discuss the implications of these findings for the AGN synthesis models for the XRB.
arXiv comment6 pages, 4 figures, uses psfig.sty. Accepted for publication in Advances in Space Research, Proceedings of the 32nd Scientific Assembly of COSPAR
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