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Recent Results of Gamma-Ray Imaging Observations of the Galactic Center and Crab/A0535+26 Regions

Cook, W. R. and Grunsfeld, J. M. and Heindl, W. A. and Palmer, D. M. and Prince, T. A. and Schindler, S. M. and Starr, C. H. and Stone, E. C. (1991) Recent Results of Gamma-Ray Imaging Observations of the Galactic Center and Crab/A0535+26 Regions. Advances in Space Research, 11 (8). pp. 191-202. ISSN 0273-1177. doi:10.1016/0273-1177(91)90171-F.

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Imaging observations at hard X-ray and γ-ray energies of the Galactic center and Crab/A0535+26 regions are presented. The measurements were made in a series of high altitude balloon flights of a coded aperture γ-ray telescope developed by Caltech. The first coded aperture images of the Galactic center region above 35 keV reveal a strong γ-ray source located 0.7 ± 0.1° away from the Galactic nucleus, consistent with the known X-ray source 1E1740.7-2942. In addition a second source consistent in position with GX354+0 has been observed. Flux estimates and upper limits from two other known sources are also discussed. Coded aperture observations of the Crab and A0535+26 are presented, demonstrating the ability of coded aperture instruments to observe multiple time variable sources simultaneously.

Item Type:Article
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URLURL TypeDescription
Prince, T. A.0000-0002-8850-3627
Stone, E. C.0000-0002-2010-5462
Additional Information:© 1991 COSPAR. Published by Elsevier. We acknowledge the important contributions to the development of the GRIP telescope made y W. Althouse, D. Burke, A. Cummings, M. Finger, J. Weger, and the personnel of Central Engineering Services at the California Institute of Technology. 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 grant NAGW-1919.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1990
Issue or Number:8
Record Number:CaltechAUTHORS:20140509-081734393
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45626
Deposited By: Deborah Miles
Deposited On:09 May 2014 19:18
Last Modified:10 Nov 2021 17:14

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