Repeating Fast Radio Bursts from Pulsar–Asteroid Belt Collisions: Frequency Drifting and Polarization
Liu,Ze-Nan1,2; Wang,Wei-Yang3,4; Yang,Yuan-Pei5; Dai,Zi-Gao1,2
Source PublicationThe Astrophysical Journal
AbstractAbstract Fast radio bursts (FRBs) are a new kind of extragalactic radio transients. Some of them show repeating behaviors. Recent observations indicate that a few repeating FRBs (e.g., FRB 121102) present time–frequency downward drifting patterns and nearly 100% linear polarization. Following the model of Dai et al. who proposed that repeating FRBs may originate from a slowly rotating, old-aged pulsar colliding with an asteroid belt around a stellar-mass object, we focus on the prediction of time–frequency drifting and polarization. In this scenario, the frequency drifting is mainly caused by the geometric structure of a pulsar magnetosphere, and the drifting rate–frequency index is found to be 25/17. On the other hand, by considering the typical differential mass distribution of incident asteroids, we find that an asteroid with mass m???1017 g colliding with the pulsar would contribute abundant gravitational energy, which powers an FRB. A broad frequency band of the FRBs would be expected, due to the mass difference of the incident asteroids. In addition, we simulate the linear polarization distribution for the repeating FRBs, and constrain the linear polarization with ?30% for the FRBs with flux of an order of magnitude lower than the maximum flux.
KeywordRadio bursts Asteroids Minor planets Neutron stars Radio transient sources
WOS IDIOP:0004-637X-905-2-abc55c
PublisherThe American Astronomical Society
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Document Type期刊论文
Corresponding AuthorDai,Zi-Gao
Affiliation1.School of Astronomy and Space Science, Nanjing University, Nanjing 210023, People's Republic of China;
2.Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing, People's Republic of China
3.Key Laboratory for Computational Astrophysics, National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Beijing 100101, People's Republic of China
4.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China
5.South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500, People's Republic of China
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GB/T 7714
Liu,Ze-Nan,Wang,Wei-Yang,Yang,Yuan-Pei,等. Repeating Fast Radio Bursts from Pulsar–Asteroid Belt Collisions: Frequency Drifting and Polarization[J]. The Astrophysical Journal,2020,905(2).
APA Liu,Ze-Nan,Wang,Wei-Yang,Yang,Yuan-Pei,&Dai,Zi-Gao.(2020).Repeating Fast Radio Bursts from Pulsar–Asteroid Belt Collisions: Frequency Drifting and Polarization.The Astrophysical Journal,905(2).
MLA Liu,Ze-Nan,et al."Repeating Fast Radio Bursts from Pulsar–Asteroid Belt Collisions: Frequency Drifting and Polarization".The Astrophysical Journal 905.2(2020).
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