Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasj...43..195a&link_type=abstract
Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 43, no. 2, 1991, p. 195-212.
Astronomy and Astrophysics
Astronomy
201
Accretion Disks, Galactic Radiation, Iron, Line Spectra, Seyfert Galaxies, X Ray Sources, X Ray Spectra, Absorption Spectra, Fluorescence, Monte Carlo Method, Spectrum Analysis
Scientific paper
Sixteen Seyfert galaxies, including 9 Seyfert 2 galaxies, were observed with the Ginga satellite. Thirteen of the Seyfert galaxies in the sample have been detected, and the Fe line and K-edge structure for these galaxies investigated. Twelve of the 13 detected galaxies also have a detected Fe line. The equivalent width of a Seyfert 1 galaxy is distributed around a mean value of about 173 eV, with a standard deviation of about 40 eV; that for a Seyfert 2 galaxy is scattered from less than 80 eV to 1300 eV. Most of the detected galaxies show an absorption feature at the energy of the iron K-edge. The iron column density determined from the iron K-edge structure ranges from less than 10 to the 17.5th/sq cm to 2 x 10 to the 19th/sq cm. Using a Monte Carlo simulation, it is found that isotropic X-ray emission within a uniformly distributed gas cannot explain the observed result. The overall distribution of the iron line and the K-edge intensity for all of the galaxies in the sample could be reproduced by using an accretion torus model with a single parameter: the viewing angle of the active galactic nucleus within a accretion torus.
Awaki Hisamitsu
Halpern Jules P.
Inoue Hajime
Koyama Katsuji
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