The signature of corotating spots in accretion disks

Details The signature of corotating spots in accretion disks The signature of corotating spots in accretion disks

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..594b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 2, p. 594-598.

Astronomy and Astrophysics

Astronomy

42

Accretion Disks, Black Holes (Astronomy), Starspots, X Ray Astronomy, Active Galactic Nuclei, Doppler Effect, Gravitational Effects, Power Spectra

Scientific paper

We investigate the general relativistic effects of spots co-moving with the accretion disk around a black hole. The observed flux increases when the spot is behind the black hole due to gravitational lensing (via an increase in the observed solid angle) and, to a lesser extent, due to the gravitational corrections to the Doppler shift. The Doppler effect and the gravitational lensing make the X-ray signal non-sinusoidal, which flattens the variability power spectrum of many spots and weakens the predicted 'cut-off' feature at the high-frequency end. Our results may explain why so far we have not observed the sharp roll-off phenomenon at high frequency in X-ray variability power spectrum of AGN.

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