Iron K-alpha line from X-ray illuminated relativistic disks

Details Iron K-alpha line from X-ray illuminated relativistic disks Iron K-alpha line from X-ray illuminated relativistic disks

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257...63m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 1, p. 63-68.

Astronomy and Astrophysics

Astrophysics

101

Accretion Disks, Iron, K Lines, X Ray Sources, Astronomical Models, Emission Spectra, Fluorescence, Seyfert Galaxies, Spectral Line Width

Scientific paper

The intensity and profile of the iron K-alpha fluorescence line from a flat, optically thick accretion disk rotating around a Schwarzschild black hole and illuminated by a central X-ray source are computed using a fully relativistic treatment of the photon intensity and shifts. The X-ray source is modeled as an isotropic point source located on the symmetry axis at a height h in units of the gravitational radius. These calculations represent a refinement and an extension of those presented elsewhere for h = 20, carried out using a weak field approximation and therefore of validity limited to inclination angles less than 70 deg. Here it is shown that at high inclination angles purely relativistic effects lead to the growth of features between the two Doppler horns and that, as a consequence, the line equivalent width maintains a sizeable value, while the centroid energy and the line width go through a broad maximum at about 80 percent. The statistical implications for the expected distribution of the line parameters in a sample of randomly oriented disks in Seyfert galaxies are briefly discussed.

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