[Previous] | [Session 28] | [Next]
D.E. Lehr, R.V. Wagoner (Stanford Univ.), J. Wilms (Inst. fur Astronomie und Astrophysik)
We investigate the effect of a hot Comptonizing corona on the energy dependence of QPO fractional amplitudes in black hole accretion disk systems; both semi-analytical solutions and Monte Carlo simulations are presented. In particular, we model the relative Comptonization of inner-disk and outer-disk photons in both slab and spherical coronal geometries with a radial temperature gradient. The results of our modeling are applied to the high-frequency QPO in the galactic microquasars, GRS 1915+105 and GRO J1655-40, in which the QPO fractional amplitudes strongly increase with increasing mean photon energy. We consider the identification of these particular QPO as diskoseismic oscillations.
If the author provided an email address or URL for general inquiries,
it is as follows: