Linearly Polarized Coherent Emission from Relativistic Magnetized Ion-Electron Shocks

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Abstract
Fast radio bursts (FRBs) are millisecond transient astrophysical phenomena and bright at radio frequencies. The emission mechanism, however, remains unsolved yet. One scenario is a coherent emission associated with the magnetar flares and resulting relativistic shock waves. Here, we report unprecedentedly large-scale simulations of relativistic magnetized ion-electron shocks, showing that strongly linear-polarized electromagnetic waves are excited. The kinetic energy conversion to the emission is so efficient that the wave amplitude is responsible for the brightness. We also find a polarization angle swing reflecting shock front modulation, implicating the polarization property of some repeating FRBs. The results support the shock scenario as an origin of the FRBs.
Funding Information
  • Ministry of Education, Culture, Sports, Science and Technology
  • Joint Institute for Computational Fundamental Science
  • Japan Society for the Promotion of Science (23K03407, 20J00280, 20KK0064)

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