A survey of hard spectrum ROSAT sources 2: optical identification of hard sources

Details A survey of hard spectrum ROSAT sources 2: optical identification of hard sources A survey of hard spectrum ROSAT sources 2: optical identification of hard sources

2001-03-03

arxiv.org/abs/astro-ph/0103055v1

Mon.Not.Roy.Astron.Soc. 325 (2001) 575

Astronomy and Astrophysics

Astrophysics

10 pages, 6 figures, accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2001.04436.x

We have surveyed 188 ROSAT PSPC fields for X-ray sources with hard spectra (alpha<0.5); such sources must be major contributors to the X-ray background at faint fluxes. In this paper we present optical identifications for 62 of these sources: 28 AGN which show broad lines in their optical spectra (BLAGN), 13 narrow emission line galaxies (NELGs), 5 galaxies with no visible emission lines, 8 clusters and 8 Galactic stars. The BLAGN, NELGs and galaxies have similar distributions of X-ray flux and spectra. Their ROSAT spectra are consistent with their being AGN obscured by columns of 20.51) identified hard sources have broad lines.

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