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• W3015531871 abstract "We study light curves and spectra (equivalent widths of the iron line and some other spectral characteristics) which arise by reprocessing on the surface of an accretion disc, following its illumination by a primary off-axis source — an X-ray ‘flare’, assumed to be a point-like source just above the accretion disc. We consider all general relativity effects (energy shifts, light bending, time delays, delay amplification due to the spot motion) near a rotating black hole. For some sets of parameters the reflected flux exceeds the flux from the primary component. We show that the orbit-induced variations of the equivalent width with respect to its mean value can be as high as 30% for an observer’s inclination of 30 ◦ , and much more at higher inclinations. We calculate the ratio of the reflected flux to the primary flux and the hardness ratio which we find to vary significantly with the spot phase mainly for small orbital radii. This offers the chance to estimate the lower limit of the black hole spin if the flare arises close to the black hole. We show the results for different values of the flare orbital radius." @default.
• W3015531871 created "2020-04-17" @default.
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• W3015531871 date "2007-12-01" @default.
• W3015531871 modified "2023-10-16" @default.
• W3015531871 title "Variation of the primary and reprocessed radiation in the flare-spot model" @default.
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