SIMBAD references

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):

The BeppoSAX High Energy Large Area Survey (HELLAS) has surveyed about 85 deg2 of sky in the 5-10keV band down to a flux of 4-5.10–14erg.cm–2.s–1. The source surface density of 16.9±6.4deg–2 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 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

goto Full paper

goto View the references in ADS

To bookmark this query, right click on this link: simbad:2001MNRAS.327..771F and select 'bookmark this link' or equivalent in the popup menu