The BeppoSAX High Energy Large Area Survey HELLAS, II: Number counts and X-ray spectral properties

Details The BeppoSAX High Energy Large Area Survey HELLAS, II: Number counts and X-ray spectral properties The BeppoSAX High Energy Large Area Survey HELLAS, II: Number counts and X-ray spectral properties

2001-05-30

arxiv.org/abs/astro-ph/0105524v1

Mon.Not.Roy.Astron.Soc. 327 (2001) 771

Astronomy and Astrophysics

Astrophysics

to appear in MNRAS

Scientific paper

10.1046/j.1365-8711.2001.04736.x

The BeppoSAX High Energy Large Area Survey (HELLAS) has surveyed about 85 deg^2 of sky in the 5-10 keV band down to a flux of 4-5 10^-14 erg cm-2 s-1. The source surface density of 16.9+-6.4 deg$^{-2}$ at the survey limit corresponds to a resolved fraction of the 5-10 keV X-ray background (XRB) of the order of 20-30 %. Hardness ratios 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 due to 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 to a strongly cut-off power law, is likely to be present in several sources.

Affiliated with

Also associated with

No associations

Rating

The BeppoSAX High Energy Large Area Survey HELLAS, II: Number counts and X-ray spectral properties does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The BeppoSAX High Energy Large Area Survey HELLAS, II: Number counts and X-ray spectral properties, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The BeppoSAX High Energy Large Area Survey HELLAS, II: Number counts and X-ray spectral properties will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-554984