Identification of soft high galactic latitude RASS X-ray sources - II. Sources with PSPC count rate CR < 0.5 cts/s

Citation
K. Beuermann et al., Identification of soft high galactic latitude RASS X-ray sources - II. Sources with PSPC count rate CR < 0.5 cts/s, ASTRON ASTR, 347(1), 1999, pp. 47-54
Citations number
32
Categorie Soggetti
Space Sciences
Journal title
ASTRONOMY AND ASTROPHYSICS
ISSN journal
00046361 → ACNP
Volume
347
Issue
1
Year of publication
1999
Pages
47 - 54
Database
ISI
SICI code
0004-6361(199907)347:1<47:IOSHGL>2.0.ZU;2-R
Abstract
We present a summary of spectroscopic identifications of bright soft high g alactic latitude X-ray sources from the ROSAT All-Sky Survey with total PSP C count rates 0.11 < CR < 0.5 cts s(-1) and hardness ratios HR1 < 0. This s tudy supplements the identification program of a complete sample of sources with CR greater than or equal to 0.5 cts s(-1) presented previously. Spect roscopic 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 counterpa rt exists. As for the brighter fraction of the sample, the largest source c lasses are Seyfert 1 galaxies, magnetic cataclysmic variables, and hot whit e dwarfs. In the Galactic Pole caps at \b\ greater than or similar to 40 de grees, Seyfert galaxies dominate, whereas at intermediate latitudes galacti c objects as magnetic cataclysmic variables and white dwarfs become relativ ely more frequent.