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Article overview
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Pair separation in parallel electric field of a magnetar magnetosphere and narrow spectra of fast radio bursts | Yuan-Pei Yang
; Jin-Ping Zhu
; Bing Zhang
; Xue-Feng Wu
; | Date: |
5 Jun 2020 | Abstract: | When a magnetar magnetosphere is trigged by crustal deformations, an electric
field $E_parallel$ parallel to the magnetic field line would appear via
Alvf’en waves in the charge starvation region. If electron-positron pair
bunches pre-exist, e.g., via some possible plasma instabilities, in the
magnetosphere, these pairs will undergo charge separation in the $E_parallel$
and in the meantime emit coherent curvature radiation. Following the approach
of Yang & Zhang (2018), we find that the superposed curvature radiation becomes
narrower due to charge separation, with the width of spectrum depending on the
separation between the electron and positron clumps. This mechanism can
interpret the narrow spectra of FRBs, in particular, the Galactic FRB 200428
recently detected in association with a hard X-ray burst from the Galactic
magnetar SGR J1935+2154. | Source: | arXiv, 2006.3270 | Services: | Forum | Review | PDF | Favorites |
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