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.


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    Title :

    The observations of AGNs in the 40–1300 keV energy range by the SIGMA telescope


    Contributors:
    Jourdain, E. (author) / Bassani, L. (author) / Roques, J.P. (author) / Mandrou, P. (author) / Ballet, J. (author) / Laurent, P. (author) / Lebrun, F. (author) / Paul, J. (author) / Finogenov, A. (author) / Churazov, E. (author)

    Published in:

    Advances in Space Research ; 13 , 12 ; 705-708


    Publication date :

    1993-01-01


    Size :

    4 pages




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    The Observations of AGNs in the 40-1300 keV Energy Range by the SIGMA Telescope

    Jourdain, E. / Bassani, L. / Roques, J. P. et al. | British Library Conference Proceedings | 1993



    COMPTEL Observations of AGNs

    Steinle, H. / Bloemen, H. / Collmar, W. et al. | British Library Conference Proceedings | 1993


    COMPTEL observations of AGNs

    Steinle, H. / Bloemen, H. / Collmar, W. et al. | Elsevier | 1993


    COMPTEL Observations of AGNs

    Steinle, H. | Online Contents | 1993