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Date and Time of the Query: 2019-06-24 T04:41:32 PDT
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For refcode 1994ApJS...92..343M:
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1994ApJS...92..343M REVIEW OF 3 YEARS OF OBSERVATIONS WITH THE LOW-ENERGY GAMMA-RAY TELESCOPE SIGMA ONBOARD GRANAT P. MANDROU, J. P. ROQUES, L. BOUCHET, M. NIEL, J. PAUL, J. P. LERAY, F. LEBRUN, J. BALLET, E. CHURAZOV, M. GILFANOV, R. SUNYAEVN, B. NOVIKOV, N. KHAVENSON, N. KULESHOVA, A. SHEIKHET, AND I. TSERENIN Received 1993 April 12; accepted 1993 September 17 ABSTRACT The French hard X-ray, soft gamma-ray telescope SIGMA, one of the main instruments onboard the Soviet satellite Granat, has performed sky observations in the 35 keV-1.3 MeV range during the last 3 years, with unprecedented angular resolution (a few arcminutes) in this energy range. New results have been obtained by imaging the Galactic center region with a 1.5' accuracy during more than 800 hr distributed in six periods which took place in early spring and autumn, from 1990 to 1992. The 6^deg^ x 6^deg^ region centered on the Galactic center contains more than six highly variable sources in the 100 keV domain. Galactic sources, mainly associated with hard X-ray binaries, as well as bright extragalactic objects have been analyzed and monitored during 1990-1992. The main result obtained by SIGMA was demonstrating the variability of the sky in the hard X-ray domain and pointing out the outstanding consequences of the angular resolution on the understanding of high-energy emission sites. Subject headings: Galaxy: center - gamma-rays: observations - X-rays: stars
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