Quasi-Periodic Oscillations of Scorpius X-1

Authors: Jacob Biemond

A comprehensive model for the explanation of quasi-periodic oscillations (QPOs), predicting seven QPO frequencies has recently been presented. In this work it is applied to the observed QPOs of Scorpius X-1. The three highest QPO frequencies are assumed to arise from three circular tori: an inner torus with charge Qi, a torus with mass mm in the middle and an outer torus with charge Qo, whereas the star bears a charge Qs (three tori model). As a consequence of a special interpretation of the gravitomagnetic theory, the three tori are subjected to a total number of four precessions. Expressions for the resulting four gravitomagnetic precession frequencies have recently been presented. It is argued that observation of Lense-Thirring precession need not to become manifest in this approach. For the Kepler-like frequency of the torus with total mass mm the additional contribution of the gravitational interaction between a mass element dmm and the remaining mass in the torus is explicitly calculated for the first time. The contribution appears to be small. Predictions of the new model are compatible with two sets of seven QPOs, extracted from observations of Sco X-1. The results are compared with corresponding observations and predictions for four other pulsars and two black holes. Estimates for the Lense-Thirring precessions are also compared with observed QPO frequencies.

Comments: 16 Pages, including 1 figure and 4 tables

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Submission history

[v1] 2012-11-17 04:52:33

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