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Search: WFRF:(Lee William H.) > (2004)

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1.
  • Kluzniak, Wlodek, et al. (author)
  • High-frequency QPOs as a problem in physics: non-linear resonance
  • 2004
  • In: AIP Conference Proceedings. - 0094-243X. ; 714, s. 379-382
  • Conference paper (other academic/artistic)abstract
    • The presence of a kHz frequency in LMXBs has been expected from scaling laws, by analogy with the QPO phenomenon in HMXB X-ray pulsars. Interpretation of the two kHz frequencies, observed in accreting neutron stars, in terms of non-linear resonance in strong-field gravity led to the prediction of twin QPOs in black hole systems, in a definite frequency ratio (such as 2/3). The imprint of a subharmonic of the 401 Hz rotation rate in the frequencies of the QPOs detected in the accreting millisecond pulsar is at once a signature of non-linear resonance and of coupling between accretion disk modes and the neutron star spin.
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2.
  • Lee, William H., et al. (author)
  • Resonance in forced oscillations of an accretion disk and kilohertz quasi-periodic oscillations
  • 2004
  • In: Astrophysical Journal, Letters. - 0067-0049. ; 603:2
  • Journal article (peer-reviewed)abstract
    • We have performed numerical simulations of a radially perturbed "accretion" torus around a black hole or neutron star and find that the torus performs radial and vertical motions at the appropriate epicyclic frequencies. We find clear evidence that vertical motions are excited in a nonlinear resonance when the applied perturbation is periodic in time. The strongest resonant response occurs when the frequency difference of the two oscillations is equal to one-half of the forcing frequency, precisely as recently observed in the accreting pulsar SAX J1808.4-3658, where the observed kilohertz quasi-periodic oscillation peak separation is half the spin frequency of 401 Hz.
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  • Result 1-2 of 2
Type of publication
conference paper (1)
journal article (1)
Type of content
other academic/artistic (1)
peer-reviewed (1)
Author/Editor
Abramowicz, Marek A, ... (2)
Kluzniak, Wlodek (2)
Lee, William H. (2)
University
University of Gothenburg (2)
Language
English (2)
Research subject (UKÄ/SCB)
Natural sciences (2)
Year
2004 (2)Undo refine

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