Linearly Polarized Coherent Emission from Relativistic Magnetized Ion-Electron Shocks

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  • 岩本, 昌倫
    Yukawa Institute for Theoretical Physics, Kyoto University; Faculty of Engineering Sciences, Kyushu University
  • 松本, 洋介
    Institute for Advanced Academic Research, Chiba University
  • 天野, 孝伸
    Department of Earth and Planetary Science, University of Tokyo
  • 松清, 修一
    Faculty of Engineering Sciences, Kyushu University
  • 星野, 真弘
    Department of Earth and Planetary Science, University of Tokyo

説明

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.

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