Schedule Feb 12, 1999
Probing Black Holes via Diskoseismology
Dr. Robert Wagoner, ITP & Stanford Univ
This is an overview of the results of calculations of the eigenfunctions and eigenfrequencies of norml modes of oscillation trapped within the inner region of their accretion disk by the strong-field gravitational properties of a black hole (or a weakly magnetized neutron star). The focus will be on the most robust class: the analogue of internal gravity modes in stars. Their frequency which corresponds to the lowest mode numbers depends almost entirely upon only the mass and angular momentum of the black hole. Such a feature may have been detected in the X-ray fluctuation power spectra of two galactic "microquasars", allowing the angular momentum of the black hole to be determined in one case.

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