RX J1857.9+7703 , the SIMBAD biblio

1997A&AS..123..103Z - Astron. Astrophys., Suppl. Ser., 123, 103-114 (1997/May-2)

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

ZICKGRAF F.-J., THIERING I., KRAUTTER J., APPENZELLER I., KNEER R., VOGES W.H., ZIEGLER B., CHAVARRIA C., SERRANO A., MUJICA R., PAKULL M. and HEIDT J.

Abstract (from CDS):

We describe a program for the optical identification of a representative sample of RASS sources contained in six study areas north of δ=-9°, with |b^II|>20° 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, N_H. In the area near the NGP (low N_H) "extragalactic" counterparts dominate, while in the area with the highest N_H most X-ray sources are identified with stellar counterparts.

Abstract Copyright: ∼

Journal keyword(s): surveys - X-rays: general - X-rays: galaxies - X-rays: stars - galaxies: active - galaxies: cluster: general

CDS comments: SAO 9189 far from the proposed correlation (RX J1839.0+7257) (.)

Simbad objects: 18

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