Publication date: Jun 2005
Abstract:
In all microquasars with double peak high frequency QPOs, the ratio of
the frequencies is 3:2, which supports the suggestion that a non-linear
resonance between two modes of oscillation in the accretion disk plays a
role in exciting the observed modulations of the X-ray flux. We discuss
evidence in favor of this interpretation and relate the black hole spin
to the frequencies expected for various types of resonances that may
occur in nearly Keplerian disks in strong gravity. For those
microquasars where the mass of the central X-ray source is known, the
black hole spin can be deduced from a comparison of the observed and
expected frequencies.
Authors:
Török, G.; Abramowicz, M. A.; Kluźniak, W.; Stuchlík, Z.;