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Astron. Astrophys. 347, 47-54 (1999)


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Identification of soft high galactic latitude RASS X-ray sources

II. Sources with PSPC count rate CR [FORMULA] cts/s *

K. Beuermann 1,3, H.-C. Thomas 2, K. Reinsch 1, A.D. Schwope 4, J. Trümper 3 and W. Voges 3

1 Universitäts-Sternwarte, Geismarlandstrasse 11, D-37083 Göttingen, Germany
2 MPI für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85740 Garching, Germany
3 MPI für Extraterrestrische Physik, Giessenbachstrasse 1, D-85740 Garching, Germany
4 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482 Potsdam, Germany

Received 4 January 1999 / Accepted 4 May 1999

Abstract

We present a summary of spectroscopic identifications of bright soft high galactic latitude X-ray sources from the ROSAT All-Sky Survey with total PSPC count rates [FORMULA]cts s-1 and hardness ratios HR1 [FORMULA]. This study supplements the identification program of a complete sample of sources with [FORMULA]cts s-1 presented previously. Spectroscopic identifications are presented for 70 of 77 sources, 5 sources are identified by other means, and subsidiary information is given for 2 as yet unidentified sources. In practically all cases, a unique optical counterpart exists. As for the brighter fraction of the sample, the largest source classes are Seyfert 1 galaxies, magnetic cataclysmic variables, and hot white dwarfs. In the Galactic Pole caps at [FORMULA], Seyfert galaxies dominate, whereas at intermediate latitudes galactic objects as magnetic cataclysmic variables and white dwarfs become relatively more frequent.

Key words: stars: novae, cataclysmic variables – galaxies: active – galaxies: nuclei – galaxies: quasars: general – galaxies: Seyfert – X-rays: general

* Based in part on observations with the ESO/MPI 2.2m telescope at La Silla, Chile

Send offprint requests to: beuermann@uni-sw.gwdg.de

© European Southern Observatory (ESO) 1999

Online publication: June 18, 1999

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