Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-01-23
Nucl.Phys.Proc.Suppl.69:591-599,1998
Astronomy and Astrophysics
Astrophysics
Invited Talk, to appear in : The Active X-ray Sky: Results from BeppoSAX and Rossi-XTE, Nuclear Physics B Proceedings Suppleme
Scientific paper
10.1016/S0920-5632(98)00301-6
We present the preliminary results of a survey that makes use of several deep exposures obtained with the X-Ray telescopes of the BeppoSAX satellite. The survey limiting sensitivity is 5 x 10^-14 cgs in the 2-10 keV band and 7 x 10^-14 cgs in the harder 5-10 keV band. We find that the 2-10 keV LogN-LogS is consistent with that determined in ASCA surveys. The counts in the 5-10 keV band imply either a very hard average spectral slope or the existence of a population of heavily absorbed sources that can hardly be detected in soft X-ray surveys. A sample of 83 serendipitous sources has been compiled from a systematic search in 50 MECS images. The analysis of the hardness ratio of this sample also implies very hard or heavily cutoff spectral shapes.
Comastri Andrea
Fiore Fabrizio
Giommi Paolo
Maccarone Maria Concetta
Molendi Silvano
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