A possible origin of kilohertz quasi-periodic oscillations in low-mass X-ray binaries
A possible origin of kilohertz quasi-periodic oscillations in low-mass X-ray binaries
复制标题
低质量 X 射线双星中千赫兹准周期振荡的可能起源
DOI：
10.1093/pasj/psaa019
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发表时间：
2020
影响因子：
2.3
通讯作者：
Machida Mami
中科院分区：
文献类型：
--
作者：
Kato Shoji;Machida Mami
提出了低质量 X 射线双星中千赫兹准周期振荡 (QPO) 的可能起源。最近对具有磁旋转不稳定性的湍流磁场的吸积盘进行的数值磁流体动力学模拟明确表明，吸积盘的准稳态中存在双臂螺旋结构。在这种变形盘中，双臂 () c 模式 () 振荡是由波-波共振不稳定性激发的。在这些激发振荡中，径向方向 () 的基波将是孪生 QPO 的较高 kHz QPO，径向方向的第一个泛音 () 将是孪生 QPO 的较低 kHz QPO。最后一节还讨论了黑洞 X 射线双星中孪生高频 QPO 的可能原因。
A possible origin of kilohertz quasi-periodic oscillations (QPOs) in low-mass X-ray binaries is proposed. Recent numerical magnetohydrodynamic simulations of accretion disks with turbulent magnetic fields of magneto-rotational instability definitely show the presence of two-armed spiral structure in the quasi-steady state of accretion disks. In such deformed disks, two-armed () c-mode () oscillations are excited by wave–wave resonant instability. Among these excited oscillations, the fundamental in the radial direction () will be the higher kHz QPO of twin QPOs, and the first overtone () in the radial direction will be the lower kHz QPO of the twin. A possible cause of the twin high-frequency QPOs in black hole X-ray binaries is also discussed in the final section.