The observations of AGNs in the 40–1300 keV energy range by the SIGMA telescope
| Autor: | Marat Gilfanov, I. Dyatchkov, A. Finogenov, B. Novikov, J. Ballet, E. Jourdain, J. P. Roques, N. Kuleshova, Loredana Bassani, N. Khavenson, P. Mandrou, Francois Lebrun, E. M. Churazov, Philippe Laurent, R. A. Sunyaev, J. A. Paul |
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| Rok vydání: | 1993 |
| Předmět: |
Physics
Atmospheric Science X-ray astronomy Spectral shape analysis Active galactic nucleus Astrophysics::High Energy Astrophysical Phenomena media_common.quotation_subject Aerospace Engineering Sigma Astronomy Astronomy and Astrophysics X-ray telescope Quasar Astrophysics law.invention Telescope Geophysics Space and Planetary Science Sky law General Earth and Planetary Sciences Astrophysics::Galaxy Astrophysics media_common |
| Zdroj: | Advances in Space Research. 13:705-708 |
| ISSN: | 0273-1177 |
| DOI: | 10.1016/0273-1177(93)90182-b |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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