Quasi-periodic oscillations at frequencies of 5 - 8 Hz are a common feature of low-mass X-ray binaries while in their normal branch states. The authors propose that these oscillations are due to long wavelength sonic perturbations in a rotating, thick accretion disk present in these systems. The frequency of such perturbations is related to the rotation frequency and the vorticity in a simple manner and is generally of the order of the rotation frequency.
X-Ray Binaries and Recycled Pulsars
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