Abstract The SIGMA telescope realizes images of the sky in the hard X-ray domain (40 keV–1.3 MeV) through a coded mask system. The extragalactic study was one of the main objectives and has brought new results in our knowledge of the Active Galactic Nuclei behavior at high energy. In fact, the variability is the most important factor as all these objects have been showed to display strong evolution in intensity or/and spectral shape. Moreover, the discovery of a new hard X-ray source close to 3C273 and probably strongly absorbed below 40–50 keV could have many consequences in the extragalactic field.
The observations of AGNs in the 40–1300 keV energy range by the SIGMA telescope
Advances in Space Research ; 13 , 12 ; 705-708
1993-01-01
4 pages
Article (Journal)
Electronic Resource
English
The Observations of AGNs in the 40-1300 keV Energy Range by the SIGMA Telescope
Online Contents | 1993
|The Observations of AGNs in the 40-1300 keV Energy Range by the SIGMA Telescope
British Library Conference Proceedings | 1993
|British Library Conference Proceedings | 1993
|Elsevier | 1993
|Online Contents | 1993
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