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

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

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..705j&link_type=abstract

Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)705-(12)708

Astronomy and Astrophysics

Astronomy

1

Active Galactic Nuclei, Centaurus Constellation, Quasars, Seyfert Galaxies, Variability, Virgo Galactic Cluster, X Ray Astronomy, X Ray Spectra, Luminous Intensity, Photomasks, Satellite-Borne Instruments, X Ray Telescopes

Scientific paper

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 (AGN) 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 and/or spectral shape. Moreover, the discovey 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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