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Journal Article

Coherent electromagnetic emission from relativistic magnetized shocks


Beloborodov,  Andrei M.
Galaxy Formation, Cosmology, MPI for Astrophysics, Max Planck Society;

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Sironi, L., Plotnikov, I., Nättilä, J., & Beloborodov, A. M. (2021). Coherent electromagnetic emission from relativistic magnetized shocks. Physical Review Letters, 127(2): 035101. doi:10.1103/PhysRevLett.127.035101.

Cite as: https://hdl.handle.net/21.11116/0000-0009-5A2C-2
Relativistic magnetized shocks are a natural source of coherent emission, offering a plausible radiative mechanism for fast radio bursts (FRBs). We present first-principles 3D simulations that provide essential information for the FRB models based on shocks: the emission efficiency, spectrum, and polarization. The simulated shock propagates in an e± plasma with magnetization σ>1. The measured fraction of shock energy converted to coherent radiation is ≃10−3σ−1, and the energy-carrying wave number of the wave spectrum is ≃4ωc/c, where ωc is the upstream gyrofrequency. The ratio of the O-mode and X-mode energy fluxes emitted by the shock is ≃0.4σ−1. The dominance of the X mode at σ≫1 is particularly strong, approaching 100% in the spectral band around 2ωc. We also provide a detailed description of the emission mechanism for both X and O modes.