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Astrophysics > High Energy Astrophysical Phenomena

arXiv:2108.07881 (astro-ph)
[Submitted on 17 Aug 2021 (v1), last revised 18 Oct 2021 (this version, v2)]

Title:Can a strong radio burst escape the magnetosphere of a magnetar?

Authors:Andrei M. Beloborodov
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Abstract:We examine the possibility that fast radio bursts (FRBs) are emitted inside the magnetosphere of a magnetar. On its way out, the radio wave must interact with a low-density $e^\pm$ plasma in the outer magnetosphere at radii $R=10^9$-$10^{10}\,$cm. In this region, the magnetospheric particles have a huge cross section for scattering the wave. As a result, the wave strongly interacts with the magnetosphere and compresses it, depositing the FRB energy into the compressed field and the scattered radiation. The scattered spectrum extends to the $\gamma$-ray band and triggers $e^\pm$ avalanche, further boosting the opacity. These processes choke FRBs, disfavoring scenarios with a radio source confined at $R\ll 10^{10}\,$cm. Observed FRBs can be emitted by magnetospheric flare ejecta transporting energy to large radii.
Comments: 6 pages, 1 figure, accepted to ApJL
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE)
Cite as: arXiv:2108.07881 [astro-ph.HE]
  (or arXiv:2108.07881v2 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.2108.07881
Related DOI: https://doi.org/10.3847/2041-8213/ac2fa0

Submission history

From: Andrei M. Beloborodov [view email]
[v1] Tue, 17 Aug 2021 21:14:02 UTC (321 KB)
[v2] Mon, 18 Oct 2021 10:31:34 UTC (324 KB)
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