WeiYang Wang1; JiGuang Lu4; SongBo Zhang2; XueLei Chen1; Rui Luo10; RenXin Xu3
Source Publication中国科学物理学力学天文学英文版
AbstractGiant pulses(GPs) are extremely bright individual pulses of radio pulsar. In microbursts of Crab pulsar, which is an active GP emitter, zebra-pattern-like spectral structures are observed, which are reminiscent of the 'zebra bands' that are observed in type Ⅳ solar radio flares. However, band spacing linearly increases with the band center frequency of ~5-30 GHz. In this study, we propose that the Crab pulsar GP can originate from the coherent instability of plasma near a light cylinder. Further, the growth of coherent instability can be attributed to the resonance observed between the cyclotron-resonant-excited wave and the background plasma oscillation. The particles can be injected into the closed-field line regions owing to magnetic reconnection near a light cylinder. These particles introduce a large amount of free energy that further causes cyclotron-resonant instability, which grows and amplifies radiative waves at frequencies close to the electron cyclotron harmonics that exhibit zebra-pattern-like spectral band structures. Further, these structures can be modulated by the resonance between the cyclotron-resonant-excited wave and the background plasma oscillation. In this scenario, the band structures of the Crab pulsar can be well fitted by a coherent instability model, where the plasma density of a light cylinder should be ~1013-15 cm-3, with an estimated gradient of >5.5 × 105 cm-4. This process may be accompanied by high-energy emissions. Similar phenomena are expected to be detected in other types of GP sources that have magnetic fields of ? 106 G in a light cylinder.
Document Type期刊论文
Affiliation1.Key Laboratory for Computational Astrophysics,National Astronomical Observatories,Chinese Academy of Sciences
3.School of Physics and State Key Laboratory of Nuclear Physics and Technology,Peking University
5.Key Laboratory of Radio Astronomy,Chinese Academy of Sciences
7.CSIRO Astronomy and Space Science,Australia Telescope National Facility,Australia
8.International Centre for Radio Astronomy Research,University of Western Australia,Australia
9.Center for High Energy Physics,Peking University
10.Kavli Institute for Astronomy and Astrophysics,Peking University
11.Department of Astronomy,School of Physics,Peking University
Recommended Citation
GB/T 7714
WeiYang Wang,JiGuang Lu,SongBo Zhang,et al. pulsargiantpulsecoherentinstabilitynearlightcylinder[J]. 中国科学物理学力学天文学英文版,2019,000(007):10.
APA WeiYang Wang,JiGuang Lu,SongBo Zhang,XueLei Chen,Rui Luo,&RenXin Xu.(2019).pulsargiantpulsecoherentinstabilitynearlightcylinder.中国科学物理学力学天文学英文版,000(007),10.
MLA WeiYang Wang,et al."pulsargiantpulsecoherentinstabilitynearlightcylinder".中国科学物理学力学天文学英文版 000.007(2019):10.
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