The iron line and high energy bump as X-ray signatures of cold matter in Seyfert 1 galaxies

Details The iron line and high energy bump as X-ray signatures of cold matter in Seyfert 1 galaxies The iron line and high energy bump as X-ray signatures of cold matter in Seyfert 1 galaxies

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247...25m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 1, July 1991, p. 25-34. Research supported by CNR, Ministero dell'Uni

Astronomy and Astrophysics

Astronomy

275

Galactic Radiation, Seyfert Galaxies, X Ray Spectra, Black Holes (Astronomy), Iron, Line Spectra

Scientific paper

Numerical results on the spectral effects produced by 'cold', optically thick matter distributed around the primary X-ray source in simple axisymmetric configurations of Seyfert 1 galaxies are discussed. Quantitative model predictions on the reprocessed radiation, when the matter is assumed to be distributed in an accretion disk, are presented. The case of a flat accretion disk and a point source placed above the disk on its symmetry axis is treated in detail, taking account of the general relativistic and kinematic effects, which have dramatic consequences on the shape of the K line and edge. These effects are less relevant for the equivalent width of the line and for the strength of the high energy bump. The latter's maximum value is about 150 eV for a flat, 180 eV for a conical, and 230 eV for a concave disk seen face-on. Several observational implications are discussed; in particular, it is noted that the relativistic and kinematic effects on the shape of the edge might lead to a misinterpretation of low-resolution measurements in terms of absorption by highly ionized iron.

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