Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993adspr..13..221a&link_type=abstract
Advances in Space Research (ISSN 0273-1177), vol. 13, no. 12, p. (12)221-(12)230
Astronomy and Astrophysics
Astronomy
33
Active Galactic Nuclei, Astronomical Models, Background Radiation, Iron, Occultation, Seyfert Galaxies, X Ray Astronomy, X Ray Spectra, Ginga Satellite, Heao 2, Infrared Astronomy Satellite, Proportional Counters, Quasars
Scientific paper
We observed twenty-eight Seyfert 2 galaxies with the Japanese X-ray satellite, Ginga, and found Seyfert 2 galaxies, in general, have the X-ray spectral characteristics of obscured Seyfert 1 nuclei. This results agrees with the predictions from the Unified Seyfert model proposed by Antonucci and Miller. However, among the observed Seyfert 2 galaxies, there are a few galaxies with no evidence of an obscuration, contrary to the general predictions of the unified model. We note that type 2 active galactic nuclei (AGN) will contribute to the Cosmic Diffuse X-ray Background, if the unified Seyfert model can be extended to the far distant AGN such as quasars.
Awaki Hisamitsu
Koyama Katsuji
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