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High-energy X-ray observations of the Galactic center region
Knight, F. K.; Johnson, W. N., III; Kurfess, J. D.; Strickman, M. S.
AA(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC), AB(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC), AC(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC), AD(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 15, 1985, p. 557-567. Research supported by the National Academy of Sciences, U.S. Navy, and NASA. (ApJ Homepage)
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NASA/STI Keywords:
Galactic Nuclei, Gamma Ray Astronomy, Milky Way Galaxy, Stellar Spectrophotometry, X Ray Sources, Balloon-Borne Instruments, Heao, Scintillation Counters
Bibliographic Code:


The authors present results from high-energy X-ray observations (18 - 250 keV) of the region within 5° of the galactic center on 1977 November 24 with a balloon-borne scintillation detector. The detector had a point source 3 sigma detection threshold of 40 muJy (2 - 10 keV) for a Crab-like spectrum. The authors consider the known 2 - 10 keV sources to determine which are strongest above 200 keV and find an acceptable fit to their data using the bulge sources GX 3+1 and GX 5-1, the binary GX 1+4, the transient A1743-322, and A1742-294. More than one of these sources must vary to produce the variation in the gamma-ray continuum slope and integrated flux (60 - 250 keV) observed 2 years later by HEAO 3.

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