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On the Magnetospheric Origin of Repeating Fast Radio Bursts
Wang,Wei-Yang1,2,3; Xu,Renxin3,4,5; Chen,Xuelei1,2,6
2020-08-01
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume899Issue:2
AbstractAbstract A bright radio burst was newly discovered in SGR 1935+2154, which exhibits some fast radio burst (FRB)-like temporal and frequency properties, suggesting a neutron star (NS)/magnetar magnetospheric origin of FRBs. We propose an explanation of the temporal and frequency properties of sub-pulses of repeating FRBs based on the generic geometry within the framework of charged-bunching coherent curvature radiation in the magnetosphere. The sub-pulses in a radio burst come from bunches of charged particles moving along different magnetic field lines. Their radiation beams sweep across the line of sight at different times, and those radiating at the more curved part tend to be seen earlier and at higher frequency. However, by considering bunches generated at slightly different times, we find there is also a small probability that the emission from the less curved part can be seen earlier. We simulate the time–frequency structures by deriving various forms of the electric acceleration field in the magnetosphere. This structure of sub-pulses is a natural consequence of coherent curvature radiation from an NS/magnetar magnetosphere with suddenly and violently triggered sparks. We apply this model to explain the time–frequency structure within a specific dipolar configuration by invoking the transient pulsar-like sparking from the inner gap of a slowly rotating NS, and we have also applied it to more generic configurations.
KeywordRadio transient sources Magnetars Neutron stars Radio bursts Non-thermal radiation sources
DOI10.3847/1538-4357/aba268
Language英语
WOS IDIOP:0004-637X-899-2-aba268
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/61790
Collection中国科学院国家天文台
Affiliation1.Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100101, People's Republic of China; wywang@bao.ac.cn, xuelei@cosmology.bao.ac.cn
2.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
3.School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, People's Republic of China
4.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People's Republic of China
5.Department of Astronomy, School of Physics, Peking University, Beijing 100871, People's Republic of China
6.Center for High Energy Physics, Peking University, Beijing 100871, People's Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Wang,Wei-Yang,Xu,Renxin,Chen,Xuelei. On the Magnetospheric Origin of Repeating Fast Radio Bursts[J]. The Astrophysical Journal,2020,899(2).
APA Wang,Wei-Yang,Xu,Renxin,&Chen,Xuelei.(2020).On the Magnetospheric Origin of Repeating Fast Radio Bursts.The Astrophysical Journal,899(2).
MLA Wang,Wei-Yang,et al."On the Magnetospheric Origin of Repeating Fast Radio Bursts".The Astrophysical Journal 899.2(2020).
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