The magnetohydrodynamics model of twin kilohertz QPOs in LMXBs
Changsheng Shi, Xiang-Dong Li
TL;DR
This paper proposes a magnetohydrodynamics-based model explaining twin kilohertz QPOs in LMXBs by coupling resonant MHD modes in neutron star magnetospheres, linking QPOs with neutron star spin frequencies.
Contribution
It introduces a novel MHD oscillation mode coupling model that explains twin kHz QPOs and their relation to neutron star spins in LMXBs.
Findings
Model accounts for observed QPO frequencies in six LMXBs.
Coupling of MHD modes explains twin QPOs.
Relates QPO frequencies directly to neutron star spin.
Abstract
We suggest an explanation for the twin kilohertz quasi-periodic oscillations (kHz QPOs) in low-mass X-ray binaries (LMXBs) based on magnetohydrodynamics (MHD) oscillation modes in neutron star magnetospheres. Including the effect of the neutron star spin, we derive several MHD wave modes by solving the dispersion equations, and propose that the coupling of the two resonant MHD modes may lead to the twin kHz QPOs. This model naturally relates the upper, lower kHz QPO frequencies with the spin frequencies of the neutron stars, and can well account for the measured data of six LMXBs.
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Taxonomy
TopicsAstrophysical Phenomena and Observations · Geophysics and Sensor Technology · Pulsars and Gravitational Waves Research