Identification of a complete sample of northern ROSAT All-Sky Survey X-ray sources. II. The optical observations

Details Identification of a complete sample of northern ROSAT All-Sky Survey X-ray sources. II. The optical observations Identification of a complete sample of northern ROSAT All-Sky Survey X-ray sources. II. The optical observations

May 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26as..123..103z&link_type=abstract

A & A Supplement series, Vol. 123, May II 1997, 103-114.

Astronomy and Astrophysics

Astronomy

67

Surveys, X-Rays: General, X-Rays: Galaxies, X-Rays: Stars, Galaxies: Active, Galaxies: Cluster: General

Scientific paper

We describe a program for the optical identification of a representative sample of RASS sources contained in six study areas north of delta = -9 deg, with |bII| >~ 20 deg including one region near the North Galactic pole (NGP) and one near the North Ecliptic pole (NEP) and present some preliminary results. A full identification has been carried out for a count-rate and area-limited complete subsample comprising 674 sources. The ratio of ``extragalactic'' ( e.g. AGN, clusters of galaxies) to ``stellar'' (e.g. coronal emitters, active binaries) counterparts was found to depend on the galactic neutral hydrogen column density, NH. In the area near the NGP (low NH) ``extragalactic'' counterparts dominate, while in the area with the highest NH most X-ray sources are identified with stellar counterparts.

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