Impact of Reprocessing in Flared Accretion Disks on the Temporal Properties of X-ray Binaries HEAD 2000, November 2000 Session 31.
Observations show that accretion disks in many X-ray binaries are flared.
The outer edge of the disk intercepts radiation from the central X-ray source. Part of that radiation is absorbed and reemitted in the optical and UV spectral range. This radiation is delayed and smeared comparing with the intrinsic X-ray radiation. We compute transfer functions expected from isotropic and anisotropic X-ray sources in flat and flared accretion disks. We propose the model for the reprocessing which explains the breaks in the time lag Fourier spectrum observed in Cyg X-1 and other Galactic black hole sources.