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The possible origin of high frequency quasi-periodic oscillations in low mass X-ray binaries

Published online by Cambridge University Press:  30 December 2019

Chang Sheng Shi Open the ORCID record for Chang Sheng Shi [Opens in a new window] ,
Shuang Nan Zhang  and
Xiang Dong Li
Chang Sheng Shi
Affiliation:
College of Material Science and Chemical Engineering, Hainan University, Hainan 570228, China email: [email protected] Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210046, China
Shuang Nan Zhang
Affiliation:
Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China Department of Astronomy, Nanjing University, Nanjing 210046, China; National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
Xiang Dong Li
Affiliation:
Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210046, China Department of Astronomy, Nanjing University, Nanjing 210046, China;
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Abstract

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We summarize our model that high frequency quasi-periodic oscillations (QPOs) both in the neutron star low mass X-ray binaries (NS-LMXBs) and black hole LMXBs may originate from magnetohydrodynamic (MHD) waves. Based on the MHD model in NS-LMXBs, the explanation of the parallel tracks is presented. The slowly varying effective surface magnetic field of a NS leads to the shift of parallel tracks of QPOs in NS-LMXBs. In the study of kilohertz (kHz) QPOs in NS-LMXBs, we obtain a simple power-law relation between the kHz QPO frequencies and the combined parameter of accretion rate and the effective surface magnetic field. Based on the MHD model in BH-LMXBs, we suggest that two stable modes of the Alfv́en waves in the accretion disks with a toroidal magnetic field may lead to the double high frequency QPOs. This model, in which the effect of the general relativity in BH-LMXBs is considered, naturally accounts for the 3:2 relation for the upper and lower frequencies of the QPOs and the relation between the BH mass and QPO frequency.

Keywords

accretionaccretion disksMHDX-rays: binaries
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S346: High-mass X-ray Binaries: Illuminating the Passage from Massive Binaries to Merging Compact Objects , August 2018 , pp. 277 - 280
Copyright
© International Astronomical Union 2019 

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