Iron features in the X-ray spectra of three Seyfert galaxies

Ginga X-ray spectra are presented for three Seyfert type 1 galaxies, each one showing evidence for a significant iron K-emission line. This line is interpreted as fluorescence from cold material, apparently lying close to the plane of the host galaxy, for NGC 5548 (near face-on) and NGC 3227 $(\sim...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 1989-10, Vol.240 (4), p.769-783
Main Authors: Pounds, K. A., Nandra, K., Stewart, G. C., Leighly, K.
Format: Article
Language:English
Subjects:
Astronomy
Earth, ocean, space
Exact sciences and technology
Quasars. Active or peculiar galaxies, objects, and systems
Stellar systems. Galactic and extragalactic objects and systems. The universe
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Summary:Ginga X-ray spectra are presented for three Seyfert type 1 galaxies, each one showing evidence for a significant iron K-emission line. This line is interpreted as fluorescence from cold material, apparently lying close to the plane of the host galaxy, for NGC 5548 (near face-on) and NGC 3227 $(\sim 60^{\circ}$ inclination). The additional detection of a large iron K-absorption edge in NGC 5506 suggests that the fluorescent line arises, in this third case, from material in the line-of-sight to the hard X-ray source. Evidence for substantial ionization of the re-processing material in NGC 5506 places constraints on its distance from the central source and, hence, on its density.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/240.4.769