SHEEP: the ASCA 5-10 keV survey

Details SHEEP: the ASCA 5-10 keV survey SHEEP: the ASCA 5-10 keV survey

2001-01-05

arxiv.org/abs/astro-ph/0101077v1

Astronomy and Astrophysics

Astrophysics

To appear in Proc. of "X-ray astronomy 2000",(Palermo Sep. 2000), Eds. R. Giacconi, L. Stella, S. Serio, ASP Conf. Series, in

Scientific paper

We present the first results of the hard (5-10 keV) ASCA GIS survey SHEEP (Search for the High Energy Extragalactic Population). We have analysed 149 fields covering an area of 39 sq. deg detecting 69 sources. Several of these appear to be associated with QSOs and Seyfert-1 galaxies but with hard X-ray spectra, probably due to high absorption. Indeed, the hardness ratio analysis shows that the spectra of the majority of our sources can be represented with a ``scatterer'' model similar to obscured Seyfert galaxies locally. According to this model, our sources present high intrinsic absorption (logN_H~23) but also significant amounts of soft X-ray emission coming from scattered light.

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