Absorption of Waves in Accretion Disks. I. Resonance at the Radius Where the Wave Frequency Matches the Vertical BruntVaisala Frequency
Abstract
The propagation properties of internal gravity waves in a rotating torus are considered. The oscillations are assumed to be axisymmetric and adiabatic. In the shortwavelength limit in the vertical direction, the gravity waves whose frequency is omega are confined in the region in which [omega N(r)][omega kappa (r)]<0 holds, where N and kappa are the BruntVaisala frequency for vertical displacement and the epicyclic frequency, respectively, and r is the radial coordinate. We find that the gravity waves are resonantly absorbed to heat the plasma at the radius where omega equals N(r). This radius is probably located in the innermost region of the torus, where most Xrays are emitted. Some implications of this result, with respect to quasiperiodic oscillations observed from lowmass Xray binaries, are briefly discussed.
 Publication:

Publications of the Astronomical Society of Japan
 Pub Date:
 October 1995
 Bibcode:
 1995PASJ...47..645H
 Keywords:

 ACCRETION DISKS;
 HYDRODYNAMICS;
 XRAYS: BINARIES