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

Identification of soft high galactic latitude RASS X-ray sources

II. Sources with PSPC count rate CR cts/s ^*

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

1</sup> 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 cts s^-1 and hardness ratios HR1 . This study supplements the identification program of a complete sample of sources with 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 , 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

SIMBAD Objects

Contents

• 1. Introduction
• 2. Bright soft high galactic latitude sources
  • 2.1. Sample definition
  • 2.2. X-ray analysis
  • 2.3. Optical counterparts
• 3. Results
  • 3.1. Unique counterparts
  • 3.2. Source content
  • 3.3. Distribution over the sky
• 4. Conclusion
• Acknowledgements
• References

© European Southern Observatory (ESO) 1999

Online publication: June 18, 1999
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