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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
Links adsabs.harvard.edu/cgi-bin/nph-data...
Subject categories Physical Sciences, Astronomy, Astrophysics and Cosmology

Abstract

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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