X-ray observations of the Galactic center by SPARTAN 1

Details X-ray observations of the Galactic center by SPARTAN 1 X-ray observations of the Galactic center by SPARTAN 1

Jul 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...330..130k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 330, July 1, 1988, p. 130-141. Research supported by Los Alamos National La

Astronomy and Astrophysics

Astronomy

73

Galactic Nuclei, Infrared Imagery, Spartan Satellites, X Ray Astronomy, X Ray Imagery, X Ray Sources, Exosat Satellite, Galactic Bulge, Heao 2, Spatial Resolution

Scientific paper

The results of Spartan 1 X-ray observations of the region within 1.25 deg of the Galactic center are presented. Four strong, hard X-ray point sources were detected: A1742-294, 1E 1740.7-2942, IE 1743.1-2843, and a new source SP 1744.2-2959 about 0.5 deg southeast of A1742-294. The new source had an intensity about 20 percent of that of A1742-294 and was relatively hard, having spectral parameters close to those of the diffuse source and of the Galactic bulge source GX 3+1. The Galactic nucleus X-ray source appears to have been a factor of four fainter during the 1985 Spartan 1 observations than during the 1979 Einstein observations. Hard, diffuse X-ray emission centered near the Galactic center, about 1 deg in extent, aligned to within 20 deg of the Galactic equator, and having a maximum 2-10 keV brightness of 1.5 x 10 to the -6th ergs/sq cm/s/sr was detected, as were two weaker point sources about 0.1 deg northeast and southeast of the Galactic nucleus, embedded in the diffuse emission.

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