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Fig. 1

image

3:2 QPOs of the three microquasars and the particular frequency relations expected for the individual QPO models. The black dotted line denotes the 3:2 frequency ratio. The QPO frequencies and their error bars correspond to those specified in Table 1. All expected frequency relations are plotted for a common referential mass, M = 10 M. The assumed values of spin then scale the curves such that they intersect with the 3:2 relation at frequencies exhibited by XTE 1550-564. Except for the Kep model, these spin values correspond to Kerr black holes, namely to a = 0.468 for the RP model, to a = 0.963 for the Ep model, to a = 0.339 for the TD and WD models, to a = 0.662 for the RP1 model, and to a = 0.372 for the RP2 model. For the Kep model, the chosen referential value of mass requires the spin a = 1.13, which exceeds the Kerr black hole limit.

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