The Einstein Galactic plane survey. II - Optical observations of Northern Hemisphere X-ray sources

Details The Einstein Galactic plane survey. II - Optical observations of Northern Hemisphere X-ray sources The Einstein Galactic plane survey. II - Optical observations of Northern Hemisphere X-ray sources

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988aj.....96..233h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 96, July 1988, p. 233-241.

Astronomy and Astrophysics

Astronomy

23

Northern Hemisphere, Sky Surveys (Astronomy), Wolf-Rayet Stars, X Ray Sources, Active Galactic Nuclei, Neutron Stars, Statistical Analysis

Scientific paper

A statistically complete sample of X-ray sources observable from the northern hemisphere has been chosen from the Einstein Galactic Plane Survey. The sample contains 67 X-ray sources. A program of photometric and spectroscopic observations has been undertaken, and optical identifications are proposed for 45 (≡67%) of the sources. Most of the unidentified sources must be noncoronal in nature, and statistical arguments imply that the majority of the unidentified sources are extragalactic. There is no evidence for a large class of low-luminosity Galactic accretion sources in the northern sample, and the authors place constraints on the spatial density of any such class. They present the results of their observing program, including finding charts of the unidentified X-ray sources. The authors note that the X-ray source 1E 1926.0+1927 is identified with the Wolf-Rayet star Roberts 93 and has an anomalously high X-ray-to-optical flux ratio.

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