The Relativistic Shift of Spectral Lines from Black–Hole Accretion Discs
نویسندگان
چکیده
Abstract. We present a simple approximate analytical formulae describing relativistic shift of a spectral line, produced by a small bright spot on a thin accretion disc around a nonrotating black hole. For the redshift factor we employ similar approach as Zhang & Bao (1991), improved in terms of Beloborodov’s (2002) approximation for light bending. Another approximation is used also for calculating light-travel time. Results are compared with an exact solution obtained by numerical integration of null geodesics.
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تاریخ انتشار 2005