Optical identification of celestial high energy sources

Details Optical identification of celestial high energy sources Optical identification of celestial high energy sources

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991msngr..66...10b&link_type=abstract

ESO Messenger (ISSN 0722-6691), no. 66, p. 10-13.

Astronomy and Astrophysics

Astronomy

5

Energy Sources, Gamma Ray Astronomy, Rosat Mission, X Ray Sources, Image Analysis, Spaceborne Telescopes, Visible Spectrum

Scientific paper

First results of a program aimed at identification of hard X-ray/soft gamma-ray sources detected by the SIGMA telescope are briefly described. A newly discovered GRANAT source called GRS 1758-258, which lies only 40 arcmin from the bright soft X-ray source GX 5-1, was studied using a coded mask technique that made it possible to fill the gap between the SIGMA hard X-ray energy range and the optical domain. A soft gamma-ray source that lies 50 arcmin from the galactic center line of sight, 1E1740.7-2942, was also studied and found to be highly variable in both flux and spectral shape. The program investigated a number of peculiar, unidentified, presumably galactic X-ray sources, including GINGA-ROSAT transients, and serendipitous EXOSAT and Einstein sources.

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