HEAD Division Meeting 1999, April 1999
Session 28. Black Holes
Poster, Wednesday, April 14, 1999, 8:30am Wed. - 2:00pm Thurs., Gold Room

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[28.05] Energy Dependence of QPO in Black Hole Accretion Disks

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.

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