Twin peak QPOs frequencies in microquasars and Sgr A The resonance and other orbital models
Paper in proceeding, 2004

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 and Kluźniak, 2001] 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.

X-ray variability

theory

observations

LMXRB and Galactic Centre black holes

Author

Marek Abramowicz

Silesian University Opava

University Of Leicester

Institution of physics at Gothenburg University

Other publications Research

W. Kluźniak

University of Zielona Góra

Polish Academy of Sciences

University Of Leicester

Zdeněk Stuchlík

Silesian University Opava

Gabriel Török

Silesian University Opava

University Of Leicester

Proceedings of RAGtime

23365668 (ISSN) 23365676 (eISSN)

1-23
8072482424 (ISBN)

RAGtime 4/5: Workshops on Black Holes and Neutron Stars
Opava, Czech Republic,

Subject Categories (SSIF 2011)

Astronomy, Astrophysics and Cosmology

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8/7/2025 1

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