Identification of soft high galactic latitude RASS X-ray sources. I. A complete count-rate limited sample

Details Identification of soft high galactic latitude RASS X-ray sources. I. A complete count-rate limited sample Identification of soft high galactic latitude RASS X-ray sources. I. A complete count-rate limited sample

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...335..467t&link_type=abstract

Astronomy and Astrophysics, v.335, p.467-478 (1998)

Astronomy and Astrophysics

Astrophysics

60

X-Rays: Galaxies, X-Rays: Stars, Galaxies: Seyfert, Novae, Cataclysmic Variables, White Dwarfs, Stars: Coronae

Scientific paper

We present a summary of spectroscopic identifications for a complete sample of bright soft high galactic latitude X-ray sources drawn from the ROSAT All-Sky Survey which have PSPC count-rates CR > 0.5 {cts s}(-1) and hardness ratios HR1 < 0. Of a total of 397 sources, 270 had catalogued counterparts although most of these were not previously known as X-ray sources; of the remaining 127 sources neither X-ray nor optical properties were previously known. Of the whole sample of very soft X-ray sources 155 were also discovered by the Wide-Field-Camera on board ROSAT. We present spectroscopic identifications of 108 sources and other identifications for further 18 sources; 1 source remains unidentified so far. In practically all cases a unique optical counterpart exists facilitating identification. The largest source classes are AGN, magnetic cataclysmic variables, and hot white dwarfs. Based in part on observations with the ESO/MPI 2.2m telescope at La Silla, Chile

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