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Imaging Hard X-Ray/Gamma-Ray Observations of the Galactic Center Region

Grunsfeld, J. and Cook, W. and Heindl, W. and Palmer, D. M. and Prince, T. and Schindler, S. (1992) Imaging Hard X-Ray/Gamma-Ray Observations of the Galactic Center Region. In: Proceedings of the 28th Yamada Conference on Frontiers of X-Ray Astronomy. Yamada Science Foundation and Universal Academy Press , Tokyo, Japan, pp. 417-418.

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Recent imaging hard X-ray fr-ray observations have highlighted the energetic activity near the Galactic center. The Caltech Gamma-Ray Imaging Payload (GRIP) observed the Galactic center region in 1988 April and again in 1989 April, at energies from 30 keV to 10 MeV. The source 1El740.7-2942 was shown by our measurements, from the 1988 observation, to be the dominant Galactic center source in the energy range 35-200 keV /1/. We present preliminary results on the spectrum of lEl740.7-2942 for the 1989 observation. The question of source variability is of particular interest since lEl 740.7-2942 has been observed to exhibit short term time variability on time scales of days, with the appearance of a hard excess of emission above 200 keV /2/. Recent observations by GRANAT /3/ have shown that the source lEl 7 40. 7-2942 transitioned into an extended "low" state in early 1991.

Item Type:Book Section
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URLURL TypeDescription
Prince, T.0000-0002-8850-3627
Additional Information:@1992 by Universal Academy Press, Inc. and Yamada Science Foundation.
Group:Space Radiation Laboratory
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Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory1991-07
Record Number:CaltechAUTHORS:20140512-093337068
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:45666
Deposited By: Deborah Miles
Deposited On:13 May 2014 21:17
Last Modified:03 Oct 2019 06:34

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