The BeppoSAX High Energy Large Area Survey (HELLAS)

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dc.creatorFiore, F.
dc.creatorGiommi, P.
dc.creatorLa Franca, F.
dc.creatorMatt, G.
dc.creatorPerola, G. C.
dc.creatorComastri, A.
dc.creatorMolendi, S.
dc.creatorElvis, M.
dc.creatorGioia, I
dc.creatorTamburelli, F.
dc.creatorRicci, D.
dc.creatorPompilio, F.
dc.date1998-11-10
dc.date.accessioned2026-07-07T02:29:01Z
dc.date.available2026-07-07T02:29:01Z
dc.descriptionWe have surveyed about 50 deg-2 of sky in the largely unexplored 5-10 keV band using the BeppoSAX MECS instrument, finding 180 sources. After correction for the non uniform sky coverage we find about 18 sources deg-2 with F(5-10keV) >= 5E-14 cgs, and resolve 30-40 % of the hard 5-10 keV Cosmic X-ray Background (XRB). Optical identification of a first small sample of sources show that most (11 out of 14) are AGN. Six of these show evidence of absorption/extinction in X-ray/optical, thus providing support to the scenario in which the hard XRB is largely made by obscured AGN (Setti & Woltjer 1989, Comastri et al. 1995).
dc.description6 pages, Proceeding of the first XMM workshop "Science with XMM" (30 Sep. - 2 Oct. 1998 ESTEC)
dc.identifierhttps://arxiv.org/abs/astro-ph/9811149
dc.identifierhttp://arxiv.org/abs/astro-ph/9811149
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13304
dc.subjectAstrophysics
dc.titleThe BeppoSAX High Energy Large Area Survey (HELLAS)
dc.typetext

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