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The orbital resonance model for twin peak kHz QPOs

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arxiv astro-ph/0401464 v1 pith:GKHJZCCW submitted 2004-01-22 astro-ph

The orbital resonance model for twin peak kHz QPOs

classification astro-ph
keywords observedtwinpeaksqposresonancex-rayblack-holedown
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Many Galactic black hole and neutron star sources in low X-ray mass binaries show QPOs (quasi periodic oscillations) in their observed X-ray fluxes, i.e. peaks in the Fourier variability power spectra. Pairs of twin peaks are observed, and in black-hole systems their frequencies (upp), (down) are in rational ratios. For example, in all four microquasars with twin peaks observed, (upp):(down) = 3:2. The rational ratios have been postulated in a model that explained twin peak QPOs as a non-linear resonance between modes of accretion disk oscillations. For those microquasars where the mass of the X-ray source is known, we determine the black-hole spin, following from the observed QPO frequencies within various models of resonance.

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Cited by 3 Pith papers

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