Interpreting black hole QPOs

Details Interpreting black hole QPOs Interpreting black hole QPOs

2003-12-15

arxiv.org/abs/astro-ph/0312396v1

Astronomy and Astrophysics

Astrophysics

Invited lecture: X-Ray Timing 2003: Rossi and Beyond (Harvard, 2003)

Scientific paper

10.1063/1.1780993

In all the microquasars with two hHz QPOs, the ratio of the frequencies is 3:2, supporting our 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 the evidence in favor of this interpretation, and we 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.

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