SIGMA: Projet d'Observatoire spatial a haute resolution angulaire pour les sources de rayons gamma |
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| Authors: | G Rivière J Paul P Mandrou |
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| Institution: | Centre National d''Etudes Spatiales, C.N.E.S., 18, avenue Edouard Belin, 31055 Toulouse-Cedex, France;Commissariat à l''Energie Atomique, C.E.A. Section d''Astrophysique, B.P. 02, 91191 Gif-Sur-Yvette Cedex, France;Centre d''Etudes Spatiales des Rayonnements, C.E.S.R., B.P. 4346, 31029 Toulouse-Cedex, France |
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| Abstract: | (SIGMA: Project of a high resolution space observatory for gamma rays sources)—The SIGMA space observatory is designed to obtain images of the sky in the hard X-ray/low energy gamma-ray domain (30–2000 keV range), with an angular accuracy of a few are min, within a field of ～7° × 7°, and a sensitivity for point sources down to a level of a few 10?6 photons cm?2s?1keV?1 (exposure 24 hr). The instrument is designed using the principle of the coded aperture mask telescope with a position sensitive detector derived from the Anger gamma-camera which is used in nuclear medicine. The pseudo-images of the sky are accumulated on board and transmitted to the ground stations for decoding processing. The gross weight of the instrument is 750 kg and its overall dimensions are 3 m long and 1.2 m in diameter. |
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