A Possible Origin of kHZ QPOs in Low-Mass X-ray Binaries
Abstract
A possible origin of kHz QPOs in low-mass X-ray binaries is proposed. Recent numerical MHD simulations of accretion disks with turbulent magnetic fields of MRI definitely show the presence of two-armed spiral structure in 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 a 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 (HFQPOs) in BH X-ray binaries is also discussed.
Keywords
Cite
@article{arxiv.2002.10630,
title = {A Possible Origin of kHZ QPOs in Low-Mass X-ray Binaries},
author = {Shoji Kato and Mami Machida},
journal= {arXiv preprint arXiv:2002.10630},
year = {2020}
}
Comments
20 pages, 6 figures; To be published in Publ. Aston. Soc. Japan, Vol. 72 (2020)