论文标题
电磁烟花：压缩磁场中快速重新连接的快速无线电爆发
Electromagnetic fireworks: Fast radio bursts from rapid reconnection in the compressed magnetar wind
论文作者
论文摘要
快速无线电爆发（FRB）生成的一种情况是磁性风的当前纸中的磁重新连接。由磁力耀斑诱导的强磁脉冲压缩，当前的片片碎片将其构成一个自相似的磁岛链。在其界面处的时间依赖性等离子体电流在其层次结合过程中产生连贯的辐射。我们使用2D辐射相对论粒子中模拟研究了这种情况，以计算相干发射的效率并获得频率尺度。与期望一致，重新连接的磁场能的一部分，$ f \ sim 0.002 $，转换为高频快速磁波的包装，这些波浪可以从磁场风中逃脱，作为无线电发射。与分析估计一致，我们发现$ 10^{47} \ text {erg} \; \ text {s}^{ - 1} $的磁性脉冲可以触发相对狭窄的ghz ghz发射，其发光度大约为$ 10^{42}} {42} \ erg} \ frirte text {erg; \ \ \ \ \ \ \ \ \ \ \ \ \ \^ - 外层次的FRB。该机制为爆发信号的向下频率漂移以及$ \ sim 100 \; \ text {ns} $最近在FRB 20200120E中检测到的$ \ sim 100 \; \ text {ns} $提供了自然的解释。
One scenario for the generation of fast radio bursts (FRBs) is magnetic reconnection in a current sheet of the magnetar wind. Compressed by a strong magnetic pulse induced by a magnetar flare, the current sheet fragments into a self-similar chain of magnetic islands. Time-dependent plasma currents at their interfaces produce coherent radiation during their hierarchical coalescence. We investigate this scenario using 2D radiative relativistic particle-in-cell simulations to compute the efficiency of the coherent emission and to obtain frequency scalings. Consistent with expectations, a fraction of the reconnected magnetic field energy, $f\sim 0.002$, is converted to packets of high-frequency fast magnetosonic waves which can escape from the magnetar wind as radio emission. In agreement with analytical estimates, we find that magnetic pulses of $10^{47}\text{erg}\;\text{s}^{-1}$ can trigger relatively narrowband GHz emission with luminosities of approximately $10^{42}\text{erg}\;\text{s}^{-1}$, sufficient to explain bright extragalactic FRBs. The mechanism provides a natural explanation for a downward frequency drift of burst signals, as well as the $\sim 100\;\text{ns}$ substructure recently detected in FRB 20200120E.
