Coded-aperture imaging of the galactic center region at gamma-ray energies
Abstract
The first coded-aperture images of the Galactic center region at energies above 30 keV have revealed two strong y-ray sources. One source has been identified with the X-ray source 1E 1740.7-2942, located 0°.8 away from the nucleus. If this source is at the distance of the Galactic center, it is one of the most luminous objects in the galaxy at energies from 35 to 200 keV. The second source is consistent in location with the X-ray source GX 354 + 0 (MXB 1728- 34). In addition, y-ray flux from the location of GX 1 + 4 was marginally detected at a level consistent with other post-1980 measurements. No significant hard X-ray or γ-ray flux was detected from the direction of the Galactic nucleus (Sgr A*), or from the direction of the recently discovered γ-ray source GRS 1758-258.
Additional Information
© 1991 American Astronomical Society. Received 1990 December 26; accepted 1991 February 26. We acknowledge the important contributions to the development of the GRIP telescope made by W. Althouse, D. Burke, A. Cummings, M. Finger, C. Starr, J. Weger, and the personnel of the Central Engineering Services at Caltech. We thank the personnel of the National Scientific Balloon Facility and the NASA Wallops Flight Facility for their excellent balloon launch support. This work was supported in part by NASA grants NGR 05-002-160 and NAGW-1919.Attached Files
Published - 1991ApJ___372L__75C.pdf
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Additional details
- Eprint ID
- 44773
- Resolver ID
- CaltechAUTHORS:20140408-114949805
- NGR 05-002-160
- NASA
- NAGW-1919
- NASA
- Created
-
2014-04-08Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Space Radiation Laboratory