Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasj...43l..37a&link_type=abstract
Astronomical Society of Japan, Publications (ISSN 0004-6264), vol. 43, no. 4, 1991, p. L37-L42.
Astronomy and Astrophysics
Astronomy
18
Absorption Spectra, Barred Galaxies, Seyfert Galaxies, Spaceborne Astronomy, X Ray Spectra, Astronomical Models, Astronomical Spectroscopy, Light Curve, Red Shift, Variability
Scientific paper
An obscured nucleus was discovered in Seyfert 2 galaxy NGC 4507 with the Ginga satellite. The 2-10 keV X-ray luminosity is 3.2 x 10 exp 43 erg/s, and the continuum radiation is well described by a power law model with a photon index of 1.34 + 0.28/-0.25. The column density of the obscuring matter is (4.9 +/-0.7) x 10 exp 23/sq cm, which is sufficiently thick to hide the broad-line region and the nucleus. An iron line with equivalent width of 420 + 100/-110 eV has also been detected in the X-ray spectrum. In order to explain the large equivalent width, a large covering factor for the matter around the nucleus is needed. The obscuration can be naturally explained in terms of a torus in the unified Seyfert model.
Awaki Hisamitsu
Koyama Katsuji
Kunieda Hideyo
Tawara Yuzuru
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