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Twin peak QPOs frequencies in microquasars and Sgr A*. The resonance and other orbital models

Conference contribution
Authors Marek A Abramowicz
Wlodek Kluzniak
Zdenek Stuchlík
Gabriel Török
Published in Proceedings of RAGtime 4/5 Workshops on black holes and neutron stars, 14-16/13-15 October 2002/2003
ISBN 80-7248-242-4
Publication year 2004
Published at Department of Physics (GU)
Language en
Subject categories Physical Sciences, Astronomy, Astrophysics and Cosmology


In all four microquasars which show twin peak kHz QPOs, the ratio of the two frequencies is 3:2. This rather strongly supports the suggestion by Abramowicz, M. A. and Kluzniak [W. Abramowicz, M. A. and Kluzniak, W., (2001). A precise determination of black hole spin in GRO J1655-40. Astronomy and Astrophysics, 374:L19] that twin peak kHz QPOs are due to a resonance between some modes of accretion disk oscillations. Detailed studies of this suggestion revealed that several such non-linear resonances are present in nearly Keplerian disks in strong gravity. Here, we fit to observations predictions of the resonance hypothesis for two particular types of non-linear resonances between vertical and radial epicyclic frequencies. For three microquasars with known masses, the fits give an accurate estimate of the spin.

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