Stochastic modeling of kHz quasi-periodic oscillation light curves
R. VioP. RebuscoMax Planck Institut für Astrophysik, K. Schwarzschild str. 1, 85748 Garching b. München, Germany e-mail: [email protected]P. AndreaniINAF – Osservatorio Astronomico di Trieste via Tiepolo 11, 34131 Trieste, Italy e-mail: [email protected]Henrik MadsenDepartment of Informatics and Mathematical Modelling, Technical University of Denmark, Richard Petersens Plads, 2800 Kgs. Lyngby, Denmark e-mail: [email protected]Rune Viig OvergaardDepartment of Informatics and Mathematical Modelling, Technical University of Denmark, Richard Petersens Plads, 2800 Kgs. Lyngby, Denmark e-mail: [email protected]
2006en
ABI
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Aims.Kluźniak & Abramowicz explain the high frequency, double peak, “3:2” QPOs observed in neutron star and black hole sources in terms of a non-linear parametric resonance between radial and vertical epicyclic oscillations of an almost Keplerian accretion disk. The 3:2 ratio of epicyclic frequencies occurs only in strong gravity. Recently, a simple model incorporating their suggestion was studied analytically: the result is that a small forcing may indeed excite the parametric 3:2 resonance. However, no explanation has been provided on the nature of the forcing which is given an “ad hoc” deterministic form.
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