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Abstract: There is a general consensus that the frequencies of the kilohertzQuasi-Periodic Oscillations kHz QPOs in neutron-star low-mass X-ray binariesare directly linked to the spin of the neutron star. The root of this idea isthe apparent clustering of the ratio of the frequency difference of the kHzQPOs and the neutron-star spin frequency, $\Delta u- u s$, at around 0.5 and1 in ten systems for which these two quantities have been measured. Here wereexamine all available data of sources for which there exist measurements oftwo simultaneous kHz QPOs and spin frequencies, and we advance the possibilitythat $\Delta u$ and $ u s$ are not related to each other. We discuss ways inwhich this possibility could be tested with current and future observations.



Autor: Mariano Mendez SRON - Netherlands Institute for Space Research, Tomaso Belloni INAF - Osservatorio Astronomico di Brera

Fuente: https://arxiv.org/







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