Internal resonance in non-linear disk oscillations and the amplitude evolution of neutron star kilohertz QPOs - Astrophysics > Cosmology and Nongalactic AstrophysicsReportar como inadecuado




Internal resonance in non-linear disk oscillations and the amplitude evolution of neutron star kilohertz QPOs - Astrophysics > Cosmology and Nongalactic Astrophysics - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We explore some properties of twin kilohertz quasiperiodic oscillationsQPOs in a simple toy-model consisting of two oscillation modes coupled by ageneral nonlinear force. We examine resonant effects by slowly varying thevalues of the tunable, and nearly commensurable, eigenfrequencies. The behaviorof the actual oscillation frequencies and amplitudes during a slow transitionthrough the 3:2 resonance is examined in detail and it is shown that both aresignificantly affected by the nonlinearities in the governing equations. Inparticular, the amplitudes of oscillations reflect a resonant exchange ofenergy between the modes, as a result the initially weaker mode may becomedominant after the transition. We note that a qualitatively similar behaviorhas been recently reported in several neutron star sources by Torok 2008,arXiv:0812.4751, who found that the difference of amplitudes in neutron startwin peak QPOs changes sign as the observed frequency ratio of the QPOs passesthrough the value 3:2.



Autor: J. Horak, M. A. Abramowicz, W. Kluzniak, P. Rebusco, G. Torok

Fuente: https://arxiv.org/



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