High angular resolution observations in the soft gamma-ray band with SIGMA

Details High angular resolution observations in the soft gamma-ray band with SIGMA High angular resolution observations in the soft gamma-ray band with SIGMA

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..665p&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)665-(12)678

Astronomy and Astrophysics

Astronomy

Active Galactic Nuclei, Data Processing, Gamma Ray Astronomy, Gamma Ray Spectra, Gamma Ray Telescopes, Imagery, Milky Way Galaxy, Novae, Photomasks, Astronomical Satellites, Image Processing, Radio Sources (Astronomy), Satellite-Borne Instruments, Sky Surveys (Astronomy), Very Large Array (Vla)

Scientific paper

The launch in December 1989, of SIGMA, one of the main devices aboard the GRANAT spacecraft, has provided high-energy astronomers for the first time with a telescope whose imaging properties in the soft gamma-ray regime match those of instruments operating in the hard X-ray band. Having examined approximately 300 celestial fields during more than two years of successful in-orbit operations, this coded-aperture telescope, sensitive to radiation in the energy range 35 keV to 1.3 MeV, has succeeded both in disentangling severe source confusion problems and in providing firm identifications and reliable spectra of sources at soft gamma-ray wavelengths. A selection of the salient scientific results obtained so far is presented, with intent to emphasize the unique contribution of a coded-mask telescope able to perform accurate images of the sky in the soft gamma-ray domain.

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