Physics
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..353c&link_type=abstract
Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #
Physics
Scientific paper
X-ray power spectra of soft state sources are broad band power laws with the slope close to 1, turning down only at high frequencies. We show that such a shape can be accommodated within an accretion corona scenario. The model is based on a general propagation model of Lyubarskii (1997) stating that the accretion rate at an inner edge of the disk keeps the memory of the disk perturbations at all radii; in this way emission, generated mostly at an inner disk edge, also preserves the memory of multi-frequency perturbations. In our model these perturbations are preserved in a natural way since the viscous time in the hot corona is much shorter than the viscous timescale in the disk. The successful model, working both for AGN and for GBHs requires the absence of the scaling of the local dynamo (which provides the perturbation mechanism) with the local disk geometrical thickness, as well as some modification of the inner disk boundary condition by the magnetic field.
Czerny Bozena
Janiuk Agnieszka
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