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. https://resolver.caltech.edu/CaltechAUTHORS:20140512-093337068
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Abstract
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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| Additional Information: | @1992 by Universal Academy Press, Inc. and Yamada Science Foundation. | ||||||
| Group: | Space Radiation Laboratory | ||||||
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| Record Number: | CaltechAUTHORS:20140512-093337068 | ||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140512-093337068 | ||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
| ID Code: | 45666 | ||||||
| Collection: | CaltechAUTHORS | ||||||
| Deposited By: | Deborah Miles | ||||||
| Deposited On: | 13 May 2014 21:17 | ||||||
| Last Modified: | 03 Oct 2019 06:34 |
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