论文标题
磁磁层中的平行电场中的对分离和快速无线电爆发的狭窄光谱
Pair separation in parallel electric field in magnetar magnetosphere and narrow spectra of fast radio bursts
论文作者
论文摘要
当磁体的磁层受到地壳变形的干扰时，与磁场线并行的电场$ e_ \并行$通过电荷饥饿区域的AlvFén波出现。电子峰值对束将通过磁层中的两流不稳定性生成，这些对将在$ e_ \ parallel $中进行电荷分离，同时发出相干曲率辐射。遵循Yang＆Zhang（2018）的接近，我们发现，由于电荷的分离，超倾斜的曲率辐射变得更窄，其频谱宽度取决于电子和正电子团之间的分离。该机制可以解释FRB的狭窄光谱，特别是Galactic FRB 200428的光谱最近与Galactic Magnetar SGR J1935+2154的硬X射线爆发有关。
When the magnetosphere of a magnetar is perturbed by crustal deformation, an electric field $E_\parallel$ parallel to the magnetic field line would appear via Alvfén waves in the charge starvation region. The electron-positron pair bunches will be generated via two-stream instability in the magnetosphere, and these pairs will undergo charge separation in the $E_\parallel$ and in the meantime emit coherent curvature radiation. Following the approach of Yang & Zhang (2018), we find that the superposed curvature radiation becomes narrower due to charge separation, with the width of spectrum depending on the separation between the electron and positron clumps. This mechanism can interpret the narrow spectra of FRBs, in particular, the spectrum of Galactic FRB 200428 recently detected in association with a hard X-ray burst from the Galactic magnetar SGR J1935+2154.
