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Title
Japanese: 
English:X-ray observations of the Galactic center by SPARTAN 1 
Author
Japanese: 河合 誠之, Fenimore, E. E., Middleditch, J., Cruddace, R. G., Fritz, G. G., Snyder, W. A., Ulmer, M. P..  
English: Kawai, N., Fenimore, E. E., Middleditch, J., Cruddace, R. G., Fritz, G. G., Snyder, W. A., Ulmer, M. P..  
Language English 
Journal/Book name
Japanese: 
English:Astrophysical Journal 
Volume, Number, Page Vol. 330        pp. 130-141
Published date July 1988 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
English: 
Conference site
Japanese: 
English: 
Abstract 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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