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

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

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ragt.meet....1a&link_type=abstract

In Proceedings of RAGtime 4/5 Workshops on black holes and neutron stars, 14-16/13-15 October 2002/2003, Eds: S. Hledík and Z. S

Astronomy and Astrophysics

Astrophysics

8

Lmxrb And Galactic Centre Black Holes, X-Ray Variability, Observations, Theory

Scientific paper

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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