论文标题
中级场快速无线电爆发模型和准周期性振荡
An Intermediate-field Fast Radio Burst Model and the Quasi-periodic Oscillation
论文作者
论文摘要
在一些快速无线电爆发（FRB）（例如FRB 20191221A）以及与SGR 1935+2154的银河系FRB相关的X射线爆发中，在一些快速无线电爆发（FRB）中发现了准周期性振荡（QPO）信号。我们重新访问中间场FRB模型，其中无线电波是通过磁性波通过光缸附近的磁重新连接而生成的。磁性风中的当前纸通过从内部磁层发出的低频脉冲压缩，以触发磁重新连接。通过结合磁层的波动力学，我们演示了FRB频率，单脉冲宽度和光度如何取决于磁场的周期，磁场，QPO频率和地震能量。我们发现，该模型可以自然，一致地解释SGR 1935+2154和FRB 20191221A的X射线/无线电事件。它还可以解释在狭窄的带宽中观察到的重复FRB的广泛能量范围。
Quasi-periodic oscillation (QPO) signals are discovered in some fast radio bursts (FRBs) such as FRB 20191221A, as well as in the X-ray burst associated with the galactic FRB from SGR 1935+2154. We revisit the intermediate-field FRB model where the radio waves are generated as fast-magnetosonic waves through magnetic reconnection near the light cylinder. The current sheet in the magnetar wind is compressed by a low frequency pulse emitted from the inner magnetosphere to trigger magnetic reconnection. By incorporating the wave dynamics of the magnetosphere, we demonstrate how the FRB frequency, the single pulse width, and luminosity are determined by the period, magnetic field, QPO frequency and quake energetics of the magnetar. We find that this model can naturally and self-consistently interpret the X-ray/radio event from SGR 1935+2154 and the QPO in FRB 20191221A. It can also explain the observed wide energy range of repeating FRBs in a narrow bandwidth.
