The BeppoSAX High Energy Llarge Area Survey (HELLAS) covers the 5-10 keV band and has so far catalogued about 180 sources over 50 deg(2) of sky. After correction for the non uniform sky coverage we find 16 +/- 5 sources deg(-2) with F5-10keV greater than or equal to 5 X 10(-14) erg cm(-2) s(-1) 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 (12 out of 14) are AGN. Seven of these AGN show evidence of absorption/extintion in X-ray/optical. These results support to the scenario in which the hard XRB is made by obscured AGN.

Fiore, F., Giommi, P., LA FRANCA, F., Matt, G., Perola, G.c., Comastri, A., et al. (1999). The BeppoSAX "HELLAS" survey. ASTROPHYSICAL LETTERS & COMMUNICATIONS, 39(1-6), 657-660.

The BeppoSAX "HELLAS" survey

LA FRANCA, Fabio;Matt G;
1999-01-01

Abstract

The BeppoSAX High Energy Llarge Area Survey (HELLAS) covers the 5-10 keV band and has so far catalogued about 180 sources over 50 deg(2) of sky. After correction for the non uniform sky coverage we find 16 +/- 5 sources deg(-2) with F5-10keV greater than or equal to 5 X 10(-14) erg cm(-2) s(-1) 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 (12 out of 14) are AGN. Seven of these AGN show evidence of absorption/extintion in X-ray/optical. These results support to the scenario in which the hard XRB is made by obscured AGN.
1999
Fiore, F., Giommi, P., LA FRANCA, F., Matt, G., Perola, G.c., Comastri, A., et al. (1999). The BeppoSAX "HELLAS" survey. ASTROPHYSICAL LETTERS & COMMUNICATIONS, 39(1-6), 657-660.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11590/119990
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