A repeating X-ray signal with a period of about 28 minutes is claimed in two independent observations of NGC 4151, with uncorrected combined significance 5.2 sigma that falls to 3.2 sigma under the paper's strictest trial correction.
Origin and interpretation of kilohertz QPOs from strange stars in X-ray binary system: theoretical hydrodynamical description
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We model and interpret the Kilohertz QPOs from the hydrodynamical description of accretion disk around a rapidly rotating compact strange star. The higher QPO frequency is described by the viscous effects of accretion disk leading to shocks, while the lower one is taken to be the Keplerian motion of the accreting matter. Comparing our results with the observations for two of the fastest rotating compact stellar candidates namely, 4U~1636-53 and KS 1731-260, we find that they match to a very good approximation, thus interpreting them as strange stars.
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Detection and Characterization of Quasi-Periodic Oscillations in Seyfert Galaxy NGC 4151
A repeating X-ray signal with a period of about 28 minutes is claimed in two independent observations of NGC 4151, with uncorrected combined significance 5.2 sigma that falls to 3.2 sigma under the paper's strictest trial correction.