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Internal resonance in nonlinear disk oscillations and the amplitude evolution of neutron-star kilohertz QPOs

Författare och institution:
J. Horák (-); Marek A Abramowicz (Institutionen för fysik (GU)); W. Kluzniak (-); P. Rebusco (-); G. Török (-)
Publicerad i:
Astronomy and Astrophysics, 499 ( 2 ) s. 535-540
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
We study the properties of twin kilohertz quasiperiodic oscillations (QPOs) with a simple toy model consisting of two oscillation modes coupled with a general nonlinear force. We examine resonant effects by slowly varying the values of the tunable, and nearly commensurable, eigenfrequencies. The behavior of the true oscillation frequencies and amplitudes during a slow transition through the 3:2 resonance is examined in detail, and it is shown that both are affected significantly by the nonlinearities in the governing equations. In particular, the amplitudes of oscillations reflect a resonant exchange of energy between the modes, and as a result the initially weaker mode may become dominant after the transition. We note that a qualitatively similar behavior was reported for several neutron-star sources where the difference in the amplitudes of neutron-star twin-peak QPOs changes sign as the observed frequency ratio of the QPOs passes through the value 3:2.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
X-rays: binaries, stars: neutron, accretion, accretion disks
Postens nummer:
Posten skapad:
2010-03-03 12:32
Posten ändrad:
2010-03-03 20:18

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