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

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

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.238..729f&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 238, May 15, 1989, p. 729-736.

Astronomy and Astrophysics

Astronomy

678

Accretion Disks, Black Holes (Astronomy), Cygnus Constellation, X Ray Fluorescence, X Ray Spectra, Black Body Radiation, Emission Spectra, Line Spectra, Red Shift

Scientific paper

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 disk geometry for the cold gas, the effects of Doppler-broadening and gravitational and transverse redshifts produce a characteristic line profile which depends upon inclination. It is shown here that the broad, iron emission line found in Cyg X-1 by Barr et al. (1985) is well modeled by fluorescent emission from the inner parts of an accretion disk inclined at about 30 degrees.

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