论文标题
FRB 200428的双峰脉冲轮廓：磁性冲击遇到密度跳跃的同步器maser发射
Double-peaked Pulse Profile of FRB 200428: Synchrotron Maser Emission from Magnetized Shocks Encountering a Density Jump
论文作者
论文摘要
最近，已经检测到了与银河磁铁SGR 1935+2154的强X射线爆发相关的快速无线电爆发（FRB）200428，这是支持FRB的磁铁祖细胞模型的直接证据。假设FRB辐射机制是磁性冲击的同步器maser发射，我们通过引入上游介质的密度跳跃结构来开发特定的方案，因此FRB 200428的双峰特征是自然的结果。在这种情况下，可以很好地解释两种脉冲的光度和发射频率。此外，我们发现冲击加速电子的同步加速器发射在X射线带中，因此，这可能至少是观察到的X射线通量的至少一部分。通过适当的升级，这种密度跳跃方案可能会在未来具有多个峰的FRB上应用。
Very recently a fast radio burst (FRB) 200428 associated with a strong X-ray burst from the Galactic magnetar SGR 1935+2154 has been detected, which is direct evidence supporting the magnetar progenitor models of FRBs. Assuming the FRB radiation mechanism is synchrotron maser emission from magnetized shocks, we develop a specific scenario by introducing a density jump structure of upstream medium, and thus the double-peaked character of FRB 200428 is a natural outcome. The luminosity and emission frequency of two pulses can be well explained in this scenario. Furthermore, we find that the synchrotron emission of shock-accelerated electrons is in the X-ray band, which therefore can be responsible for at least a portion of observed X-ray fluence. With proper upgrade, this density jump scenario can be potentially applied to FRBs with multiple peaks in the future.
