The discovery of a luminous radio burst, FRB 200428, with properties similar to those of fast radio bursts (FRBs), in coincidence with an X-ray flare from the Galactic magnetar SGR 1935+2154, supports magnetar models for cosmological FRBs. The burst’s X-ray to radio fluence ratio, as well as the X-ray spectral shape and peak energy, are consistent with FRB 200428being the result of an ultra-relativistic shock (powered, e.g., by an ejected plasmoid) propagating into a magnetized baryon-rich external medium; the shock simultaneously generates X-ray/gamma-rays via thermal synchrotron emission from electrons heated behind the shock, and coherent radio emission via the synchrotron maser mechanism. Here, we point out that a unique consequence of this baryon-loaded shock scenario is the generation of a coincident burst of high-energy neutrinos, generated by photohadronic interaction of relativistic ions—heated or accelerated at the shock—with thermal synchrotron photons. We estimate the properties of these neutrino burst FRB counterparts and find that a fraction ∼10⁻⁸–10⁻⁵ of the flare energy (or ∼10⁻⁴–10⁻¹ of the radio isotropic energy) is channeled into production of neutrinos with typical energies ∼TeV–PeV. We conclude by discussing prospects for detecting this signal with IceCube and future high-energy neutrino detectors.

与快速射电暴 (FRB) 性质相似的发光射电暴 FRB 200428 的发现与来自银河磁星 SGR 1935+2154 的 X 射线耀斑同时发生，支持了宇宙学 FRB 的磁星模型。爆发的 X 射线与射电注量比以及 X 射线光谱形状和峰值能量与 FRB 200428 一致，这是超相对论冲击（例如，由喷射的等离子体团提供动力）传播到磁化富含重子的外部介质；冲击通过来自冲击后加热的电子的热同步辐射和通过同步加速器脉泽机制的相干无线电发射同时产生 X 射线/伽马射线。在这里，我们指出，这种重子加载激波情景的独特后果是同时产生高能中微子爆发，由相对论离子（在冲击时加热或加速）与热同步加速器光子的光强相互作用产生。我们估计了这些中微子爆发 FRB 对应物的特性，并发现约 10^-8 –10 ^-5的耀斑能量（或~ 10 ^-4 –10 ^-1的射电各向同性能量）被引导到具有典型能量~TeV-PeV 的中微子的产生中。我们最后讨论了用 IceCube 和未来的高能中微子探测器探测这个信号的前景。