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8 papers · 1 filter
Frequency Correlations of QPOs Based on a Disk Oscillation Model in Warped Disks
Shoji Kato
In previous papers we proposed a model that high-frequency quasi-periodic oscillations (QPOs) observed in black-hole and neutron-star X-ray binaries are disk oscillations (inertial…
Spin of Stellar-Mass Black Holes Estimated by a Model of Quasi-Periodic Oscillations
Shoji Kato, Jun Fukue
We have proposed in previous papers that the high-frequency pair QPOs observed in black-hole binaries with frequency ratio 3:2 are inertial-acoustic oscillations (nearly horizontal…
A Vertical Resonances of G-Mode Oscillations in Warped Disks and QPOs in Low-Mass X-Ray Binaries
Shoji Kato
Resonant oscillations in warped disks are examined in order to explain high-frequency QPOs and horizontal-branch QPOs in low-mass X-ray binaries. Different from our previous work,…
Quasi-Periodic Oscillations Resonantly Induced on Spin-Induced Deformed-Disks of Neutron Stars
Shoji Kato
We consider the situation where a spin-induced wavy perturbation is present on disks of neutron-star low-mass X-ray binaries. By non-linearly coupling with the perturbation, some m…
A Resonance Model of Quasi-Periodic Oscillations of Low-Mass X-Ray Binaries
Shoji Kato
We try to understand the quasi-periodic oscillations (QPOs) in low-mass neutron-star and black-hole X-ray binaries by a resonance model in warped disks with precession. Our main co…
Excitation of Disk Oscillations by Warps: A Model of kHz QPOs
Shoji Kato
The amplification of disk oscillations resulting from non-linear resonant couplings between the oscillations and a warp is examined. The disks are geometrically thin and general re…