Fast Radio Bursts from non-resonant Alfvén waves and synchrotron maser emission in the magnetar wind
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866918217736257536 |
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| author | Long, Killian Pe'er, Asaf |
| author_facet | Long, Killian Pe'er, Asaf |
| contents | Non-resonant interactions between Alfvén waves and a relativistic plasma result in the formation of the population inversions necessary for synchrotron maser emission (SME) across a wide range of magnetisations and temperatures. We calculate the peak frequencies of the SME resulting from this interaction and show that the characteristic frequencies and energetics of fast radio bursts (FRBs) can be produced in the relativistic wind of a magnetar using this mechanism. Wind Lorentz factors of $γ_w\gtrsim310$ are shown to be necessary to explain observed FRBs. Emission is possible at temperatures of $θ= k_bT/mc^2\lesssim 0.02$. We further examine the periods and magnetic fields of the central magnetar and demonstrate that the optimal values of these properties align with the observed magnetar population provided that the magnetosphere is disturbed by the flaring activity. These results allow the properties of the environment such as temperature and magnetisation to be probed from the observed FRB frequency and luminosity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_05840 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fast Radio Bursts from non-resonant Alfvén waves and synchrotron maser emission in the magnetar wind Long, Killian Pe'er, Asaf High Energy Astrophysical Phenomena Non-resonant interactions between Alfvén waves and a relativistic plasma result in the formation of the population inversions necessary for synchrotron maser emission (SME) across a wide range of magnetisations and temperatures. We calculate the peak frequencies of the SME resulting from this interaction and show that the characteristic frequencies and energetics of fast radio bursts (FRBs) can be produced in the relativistic wind of a magnetar using this mechanism. Wind Lorentz factors of $γ_w\gtrsim310$ are shown to be necessary to explain observed FRBs. Emission is possible at temperatures of $θ= k_bT/mc^2\lesssim 0.02$. We further examine the periods and magnetic fields of the central magnetar and demonstrate that the optimal values of these properties align with the observed magnetar population provided that the magnetosphere is disturbed by the flaring activity. These results allow the properties of the environment such as temperature and magnetisation to be probed from the observed FRB frequency and luminosity. |
| title | Fast Radio Bursts from non-resonant Alfvén waves and synchrotron maser emission in the magnetar wind |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2508.05840 |