Astronomy and Astrophysics – Astrophysics
Scientific paper
1997-11-19
Astronomy and Astrophysics
Astrophysics
4 pages; LaTeX; 1 figure included; uses epsfig package; to appear in the Proceedings of the 8th Annual October Astrophysics Co
Scientific paper
10.1063/1.55906
The observed iron K-alpha fluorescence lines in Seyfert galaxies provide strong evidence for an accretion disk near a supermassive black hole as a source of the line emission. Previous studies of line emission have considered only geometrically thin disks, where the gas moves along geodesics in the equatorial plane of a black hole. Here we extend this work to include effects on line profiles from finite disk thickness, radial accretion flow and turbulence. We adopt the Novikov-Thorne solution, and find that within this framework, turbulent broadening is the most significant effect. The most prominent changes in the skewed, double-horned line profiles is a substantial reduction in the maximum flux at both red and blue peaks. We show that at the present level of signal-to-noise in X-ray spectra, proper treatment of the actual structure of the accretion disk can change estimates of the inclination angle of the disk. Thus these effects will be important for future detailed modeling of high quality observational data.
Bromley Benjamin C.
Pariev Vladimir I.
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