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Nonlinear resonance in the accretion disk of a millisecond pulsar

Journal article
Authors Wlodek Kluzniak
Marek A Abramowicz
S. Kato
W. H. Lee
N. Stergioulas
Published in Astrophysics Journal
Volume 603
Issue 2
Pages L89-L92
ISSN 0067-0049
Publication year 2007
Published at Department of Physics (GU)
Pages L89-L92
Language en
Subject categories Physical Sciences, Astronomy, Astrophysics and Cosmology

Abstract

Two simultaneous frequencies of quasi-periodic millisecond modulation of the X-ray flux (twin kilohertz quasi-periodic oscillations) have recently been detected in an accreting 2.5 ms X-ray pulsar. Their difference, equal to about ½ of the neutron star spin rate, clearly indicates that resonant oscillations of the accretion disk have been observed. Similar nonlinear resonances may be spontaneously excited in the accretion disk in the absence of a pulsar, e.g., in black holes. We identify modes of disk oscillations whose frequencies are in agreement with the two observed ones when the rotating neutron star is modeled with realistic equations of state.

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