论文标题
FRB 200428：小行星和磁铁之间的影响
FRB 200428: an Impact between an Asteroid and a Magnetar
论文作者
论文摘要
最近检测到了快速无线电爆发（FRB）与银河系SGR 1935+2154的硬X射线爆发有关。因此，涉及FRB磁铁的场景受到了极大的青睐。在这项工作中，我们建议小行星和磁铁之间的影响可以解释这种检测。根据我们的计算，质量$ 10^{20} $ G的小行星将在接近磁盘时以$ 7 \ times 10^9 $ cm的距离中断。积聚的材料将沿着磁场线条从Alfvén半径$ \ sim 10^7 $ cm流动。掉到磁力表面后，将形成一个即时积聚柱，在磁层中产生构成的X射线爆发和FRB。我们表明，在这种情况下，FRB 200428的所有观察特征都可以自信地解释。我们预测这种特定的X射线爆发中的准周期振荡，可以用作独立的观察测试。
A fast radio burst (FRB) was recently detected to be associated with a hard X-ray burst from the Galactic magnetar SGR 1935+2154. Scenarios involving magnetars for FRBs are hence highly favored. In this work, we suggest that the impact between an asteroid and a magnetar could explain such a detection. According to our calculations, an asteroid of mass $10^{20}$ g will be disrupted at a distance of $7 \times 10^9$ cm when approaching the magnetar. The accreted material will flow along the magnetic field lines from the Alfvén radius $\sim 10^7$ cm. After falling onto the magnetar's surface, an instant accretion column will be formed, producing a Comptonized X-ray burst and an FRB in the magnetosphere. We show that all the observational features of FRB 200428 could be interpreted self-consistently in this scenario. We predict quasi-periodic oscillations in this specific X-ray burst, which can serve as an independent observational test.
