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2001MNRAS.327..771F - Mon. Not. R. Astron. Soc., 327, 771-780 (2001/November-1)
The BeppoSAX High Energy Large Area Survey (HELLAS) - II. Number counts and X-ray spectral properties.
FIORE F., GIOMMI P., VIGNALI C., COMASTRI A., MATT G., PEROLA G.C., LA FRANCA F., MOLENDI S., TAMBURELLI F. and ANTONELLI L.A.
Abstract (from CDS):
Hardness ratio analysis indicates that the spectra of a substantial fraction of the HELLAS sources (at least one-third) are harder than a alphaE=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.
Abstract Copyright: The Royal Astronomical Society
Journal keyword(s): galaxies: active - X-rays: diffuse background - X-rays: galaxies - X-rays: general
VizieR on-line data: <Available at CDS (J/MNRAS/327/771): table2.dat>
Nomenclature: Table 2: HELLAS NNN, HELLAS NNN.N, N=147 among (Nos 6-431).
Simbad objects: 148
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