Astronomy and Astrophysics – Astronomy
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..179m&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 1, p. 179-186.
Astronomy and Astrophysics
Astronomy
178
Accretion Disks, K Lines, Metallicity, Photoionization, X Ray Stars, Ginga Satellite, Iron, Schwarzschild Metric
Scientific paper
The paper calculates the properties of the iron K-alpha line emitted by an accretion disk illuminated by an external X-ray source for different values of the disk accretion rate, m-dot, and for two different source geometries: a point source located on the disk axis and an extended source above the innermost part of the disk. It is found that for large values of m-dot the matter can be significantly ionized, and the iron line equivalent width can reach values as high as 250 eV for the point source, and up to about 400 eV for the extended source; the line centroid energy, in the emitting rest frame, is significantly higher than 6.4 keV, the value for neutral iron. A further increase of m-dot leads to a strong decrease of the line intensity, because the iron becomes fully stripped in the inner region of the disk. The line profiles in the Schwarzschild metric are also calculated, and for the point source they appear much more complex than those obtained assuming neutral matter.
Fabian Andrea C.
Matt Giorgia
Ross Ronald R.
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