Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...408..507h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 408, no. 2, p. 507-513.
Astronomy and Astrophysics
Astrophysics
12
Energy Spectra, Galactic Nuclei, Gamma Ray Telescopes, Milky Way Galaxy, X Ray Sources, Interstellar Radiation, Radiant Flux Density
Scientific paper
The Galactic center region hard X-ray source 1E 1740.7-2942 has been observed with the Caltech Gamma-Ray Imaging Payload (GRIP) from Alice Springs, Australia, on 1988 April 12 and on 1989 April 3 and 4. We report here results from the 1989 measurements based on 14 hr of observation of the Galactic center region. The observations showed 1E 1740.7-2942 to be in its normal state, having a spectrum between 35 and 200 keV characterized by a power law with an exponent of -2.2 +/- 0.3 and flux at 100 keV of (7.0 +/- 0.7) x 10 exp -5 sq cm s keV. No flux was detected above 200 keV. A search for time variability in the spectrum of 1E 1740.7-2942 on one hour time scales showed no evidence for variability.
Cook Walter R.
Grunsfeld John M.
Heindl William A.
Palmer David M.
Prince Thomas A.
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