Models of high-frequency quasi-periodic oscillations and black hole spin estimates in Galactic microquasars

摘要: We explore the influence of non-geodesic pressure forces that are present in an accretion disk on frequencies its axisymmetric and non-axisymmetric epicyclic oscillation modes. {We discuss implications for models high-frequency quasi-periodic oscillations (QPOs) have been observed X-ray flux accreting black holes (BHs) three Galactic microquasars, GRS 1915+105, GRO J1655$-$40 XTE J1550$-$564. focus previously considered QPO deal with low azimuthal number modes, $\lvert m \rvert \leq 2$, outline consequences estimations BH spin, $a\in[0,1]$.} For four out six examined models, we find only small, rather insignificant changes compared to geodesic case. other two hand, there is a fair increase estimated upper limit spin. Regarding model's falsifiability, one particular model from set incompatible data. If microquasar's spectral spin estimates point $a>0.65$ were fully confirmed, more would be ruled out. Moreover, if very different values such as $a\approx 0.65$ vs. 1$ all except remain unsupported by our results. Finally, recently proposed context neutron star (NS) QPOs disk-oscillation-based modification relativistic precession model. This provides overall better fits NS data predicts realistic mass conclude it also implies significantly higher ($a\sim 0.75$ $a\sim 0.55$).