Quasi Periodic Oscillations and the Possibility of an Observational Distinction Between Neutron and Quark Stars

Details Quasi Periodic Oscillations and the Possibility of an Observational Distinction Between Neutron and Quark Stars Quasi Periodic Oscillations and the Possibility of an Observational Distinction Between Neutron and Quark Stars

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006acppb..37.1361k&link_type=abstract

Acta Physica Polonica B, vol. 37, Issue 4, p.1361

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Scientific paper

The X-rays emitted by accreting black holes and neutron stars are modulated quasi-periodically at very high frequencies. These kHz Quasi Periodic Oscillations (QPOs) often occur in pairs of frequencies that in black hole sources are in a 3:2 ratio. The frequencies likely represent two resonant oscillations of the accretion disk. We have evidence that the neutron star data point to the same ratio, and arguments suggesting that the 3:2 frequency ratio may be a signature of strong gravity. The modulation itself of the X-ray light curve may be caused by another effect of general relativity: light-bending close to the black hole. In some neutron star sources, the difference of the two kHz frequencies is very nearly equal to one-half of the stellar spin frequency, which is a clear signature of a non-linear resonance excited by the rotating neutron star.

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