X-ray fluorescence from the inner disc in Cygnus X-1

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ID: 295326
1989
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Abstract
The quasi-blackbody plus power-law spectra of many accreting black-hole sources suggests that relatively cold matter is surrounded by hard X-ray emitting plasma. Fluorescent iron lines are produced by X-irradiation of the cold gas. The shape and variability of these lines can be used to map the innermost regions around the black hole. In the case of a disc geometry for the cold gas, the effects of doppler-broadening and gravitational and transverse redshifts produce a characteristic line profile which depends upon inclination. We show here that the broad, iron emission line found in Cyg X-1 by Barr, White & Page is well modelled by fluorescent emission from the inner parts of an accretion disc inclined at ∼ 30 degrees. The mass of the central object and properties of the accretion flow can be determined by future higher resolution studies of this and similar sources, including Active Galaxies.
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Authors A. C. Fabian, M. J. Rees, L. Stella, N. E. White
Journal monthly notices of the royal astronomical society
Year 1989
DOI
10.1093/mnras/238.3.729
URL
https://academic.oup.com/mnras/article-pdf/238/3/729/3564470/mnras238-0729.pdf
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