The correlations between the spin frequencies and kHz QPOs of Neutron Stars in LMXBs

Abstract

We studied the correlations between spin frequencies and kilohertz quasi-periodic oscillations (kHz QPOs) in neutron star low mass X-ray binaries. The updated data of kHz QPOs and spin frequencies are statistically analyzed. We found that when two simultaneous kHz QPOs are present in the power spectrum, the minimum frequency of upper kHz QPO is at least 1.3 times larger than the spin frequency, i.e. ν_{s}<ν_{2min}/1.3. We also found that the average kHz QPO peak separation in 6 Atoll sources anti-correlates with the spin frequency in the form \lan\dn\ran = -(0.19\pm0.05)\ns+(389.40\pm21.67)Hz. If we shifted this correlation in the direction of the peak separation by a factor of 1.5, this correlation matches the data points of the two accretion powered millisecond X-ray pulsars, SAX J1808.4-3658 and XTE J1807-294.

arXiv comment4 pages, 2 figures, accepted for publication in A&A

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• Spin Period Evolution of Recycled Pulsar in Accreting Binary
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• Type I X-ray bursts, burst oscillations and kHz quasi-periodic oscillations in the neutron star system IGR J17191-2821
• Wave Excitation in Disks Around Rotating Magnetic Stars
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• Precision Ephemerides For Gravitational Wave Searches: II. Cyg X-2
• Constraints on kHz QPO models and stellar EOSs from SAX J1808.4-3658, Cyg X-2 and 4U 1820-30
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• Does Sub-millisecond Pulsar XTE J1739-285 Contain a Low Magnetic Neutron Star or Quark Star ?
• Fe K$\alpha$ and Fe K$\beta$ line detection in the NuSTAR spectrum of the ultra-bright Z-source Scorpius X-1
• Simultaneous observations of a pair of kilohertz QPOs and a plausible 1860 Hz QPO from an accreting neutron star system
• KHz QPOs in LMXBs, relations between different frequencies and compactness of stars
• Discovery of twin kHz quasi periodic oscillations in the low mass X-ray binary XTE J1701-407
• The emission positions of kHz QPOs and Kerr spacetime influence
• A new correlation with lower kilohertz quasi-periodic oscillation frequency in the ensemble of low-mass X-ray binaries
• Constraining the mass and moment of inertia of neutron stars from quasi-periodic oscillations in X-ray binaries