BeppoSAX HELLAS survey. II. (Fiore+, 2001)

Details BeppoSAX HELLAS survey. II. (Fiore+, 2001) BeppoSAX HELLAS survey. II. (Fiore+, 2001)

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002ycat..73270771f&link_type=abstract

VizieR On-line Data Catalog: J/MNRAS/327/771. Originally published in: 2001MNRAS.327..771F

Computer Science

X-Ray Sources

Scientific paper

The BeppoSAX High Energy Large Area Survey (HELLAS) has surveyed about 85deg2 of sky in the 5-10keV band down to a flux of 4-5x10-14erg/cm2/s. The source surface density of 16.9+/-6.4deg2 at the survey limit corresponds to a resolved fraction of the 5-10keV X-ray background (XRB) of the order of 20-30 per cent.
Hardness ratio analysis indicates that the spectra of a substantial fraction of the HELLAS sources (at least one-third) are harder than a {alpha}E=0.6 power law. This hardness may be caused by large absorbing columns. The hardness ratio analysis also indicates that many HELLAS sources may have a spectrum more complex than a single absorbed power law. A soft component, superimposed on a strongly cut-off power law, is likely to be present in several sources.
(1 data file).

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