2003/12/15 by Marek A. Abramowicz, M. A. Abramowicz, Wlodzimierz Kluzniak · 2 citations
Engineering · Physics and Astronomy · #Astrophysical Phenomena and Observations #Mechanics and Biomechanics Studies #astro-ph
paper · pdf · doi:10.1063/1.1780993
Invited lecture: X-Ray Timing 2003: Rossi and Beyond (Harvard, 2003)
arxiv created 2003/12/15 · openalex publication_date 2004/01/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29
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.