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Super-spinning compact objects and models of high-frequency quasi-periodic oscillations observed in Galactic microquasars. II. Forced resonances
Andrea Kotrlová, Eva Šrámková, Gabriel Török +2
In our previous work (Paper I) we applied several models of high-frequency quasi-periodic oscillations (HF QPOs) to estimate the spin of the central compact object in three Galacti…
Equations of state in the Hartle-Thorne model of neutron stars selecting acceptable variants of the resonant switch model of twin HF QPOs in the atoll source 4U 1636-53
Zdenek Stuchlik, Martin Urbanec, Andrea Kotrlova +2
The Resonant Switch (RS) model of twin high-frequency quasi-periodic oscillations (HF QPOs) observed in neutron star binary systems, based on switch of the twin oscillations at a r…
Black hole spin inferred from 3:2 epicyclic resonance model of high-frequency quasi-periodic oscillations
E. Sramkova, G. Torok, A. Kotrlova +5
Estimations of black hole spin in the three Galactic microquasars GRS 1915+105, GRO J1655-40, and XTE J1550-564 have been carried out based on spectral and timing X-ray measurement…
Simulations of flux variability of oscillating accretion fluid tori around Kerr black holes
Pavel Bakala, Kateřina Goluchová, Eva Šrámková +4
High frequency quasi-periodic oscillations (HF QPOs) are observed in the X-ray power-density spectra (PDS) of several microquasars and low mass X-ray binaries. Many proposed QPO mo…
Super-spinning compact objects and models of high-frequency quasi-periodic oscillations observed in Galactic microquasars
Andrea Kotrlova, Gabriel Torok, Eva Sramkova +1
We have previously applied several models of high-frequency quasi-periodic oscillations (HF QPOs) to estimate the spin of the central Kerr black hole in the three Galactic microqua…
Multi-resonance orbital model applied to high-frequency quasi-periodic oscillations observed in Sgr A*
Andrea Kotrlova, Zdenek Stuchlik, Gabriel Torok
The multi-resonance orbital model of high-frequency quasi-periodic oscillations (HF QPOs) enables precise determination of the black hole dimensionless spin a if observed set of os…
Multi-resonance orbital model of high-frequency quasi-periodic oscillations: possible high-precision determination of black hole and neutron star spin
Zdenek Stuchlik, Andrea Kotrlova, Gabriel Torok
Using known frequencies of the twin-peak high-frequency quasiperiodic oscillations (HF QPOs) and known mass of the central black hole, the black-hole dimensionless spin can be dete…
Resonant switch model of twin peak HF QPOs applied to the source 4U 1636-53
Zdenek Stuchlik, Andrea Kotrlova, Gabriel Torok
Resonant Switch (RS) model of twin peak high-frequency quasi-periodic oscillations (HF QPOs) assumes switch of twin oscillations at a resonant point where frequencies of the upper…
Resonant switch model of twin peak HF QPOs applied to the atoll source 4U 1636-53
Zdenek Stuchlik, Andrea Kotrlova, Gabriel Torok
We present a Resonant Switch (RS) model of twin peak high-frequency quasi-periodic oscillations (HF QPOs), assuming switch of twin oscillations at a resonant point, where frequenci…
Multi-resonance orbital model of HF QPOs
Zdenek Stuchlik, Andrea Kotrlova, Gabriel Torok
Using known frequencies of the twin peak high-frequency quasiperiodic oscillations (HF QPOs) and known mass M of the central black hole, the black-hole dimensionless spin a can be…
Confronting the models of 3:2 QPOs with the evidence of near extreme Kerr black hole
Andrea Kotrlova, Gabriel Torok, Eva Sramkova +1
The black hole mass and spin estimates assuming various specific models of the 3:2 high frequency quasi-periodic oscillations (HF QPOs) have been carried out in Torok et al. (2005,…
Confronting the models of 3:2 quasiperiodic oscillations with the rapid spin of the microquasar GRS 1915+105
Gabriel Torok, Andrea Kotrlova, Eva Sramkova +1
Spectral fitting of the spin a in the microquasar GRS 1915+105 estimate values higher than a=0.98. However, there are certain doubts about this (nearly) extremal number. Confirming…
Resonant radii of kHz quasi-periodic oscillations in Keplerian discs orbiting neutron stars
Zdenek Stuchlik, Andrea Kotrlova, Gabriel Torok
Exchange of dominance between twin kHz quasi-periodic oscillations (QPOs) observed in some low-mass-X-ray-binaries (LMXB) suggests the possibility of a resonance between two oscill…