# A possible origin of kilohertz quasi-periodic oscillations in low-mass X-ray binaries

Shoji Kato, Mami Machida

2 被引用数 (Scopus)

## 抄録

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 ($m=2$) c-mode ($n=1$) oscillations are excited by wave-wave resonant instability. Among these excited oscillations, the fundamental in the radial direction ($n{\rm r}=0$) will be the higher kHz QPO of twin QPOs, and the first overtone ($n{\rm r}=1$) 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.

本文言語 英語 38 Publications of the Astronomical Society of Japan 72 3 https://doi.org/10.1093/pasj/psaa019 出版済み - 6月 1 2020 はい

• 天文学と天体物理学
• 宇宙惑星科学

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