Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995adspr..15..115g&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 15, no. 5, p. (5)115-(5)118
Astronomy and Astrophysics
Astronomy
2
Galactic Bulge, Gamma Ray Astronomy, Light Curve, Molecular Clouds, X Ray Absorption, X Ray Astronomy, X Ray Scattering, X Ray Sources, X Ray Spectra, Astronomical Satellites, Spaceborne Astronomy, Spaceborne Telescopes, X Ray Telescopes
Scientific paper
The Galactic center region hard X-ray source 1E1740.7-2942 has been intensively observed with the instruments aboard Granat. We present here the results obtained with the (ART-P) coded-mask telescope in the 2.5-35 keV energy band. During 1990-1992 the source was found to be in four apparently different states of intensity corresponding to different epochs of the light curve. In the normal state its spectrum could be represented with a simple power law model (the best-fit photon index alpha approximately equals-1.35 +/- 0.09 modified by strong photoabsorption at low energies (the hydrogen column density NH approximately equals (9.4 +/- 3.1) x 1022). The effects of X-ray scattering and absorption in the molecular cloud discovered in the direction to 1E1740.7-2942 are discussed.
Grebenev Sergei A.
Pavlinsky M. N.
Sunyaev Rashid A.
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