论文标题
具有深空网络的FRB 121102的双波段无线电观察和多个爆发的检测
A Dual-band Radio Observation of FRB 121102 with the Deep Space Network and the Detection of Multiple Bursts
论文作者
论文摘要
重复快速无线电爆发（FRB）的光谱是复杂且具有时间变化的，有时在观测带中达到峰值，并显示出大约10-30％的分数发射带宽。这些光谱特征可能会深入了解重复快速无线电爆发的发射机制，也可以通过当地环境中的外在传播效应来解释它们。宽带观测可以更好地量化这种行为，并有助于区分内在和外在效应。我们通过使用70 m深空网络（DSN）射电望远镜（DSS-43）同时对重复的FRB 121102进行了2.25和8.36 GHz观察的结果。在5.7 HR连续观察会话中，我们检测到FRB 121102的6次爆发，这些爆发在2.25 GHz频带中可见。然而，尽管在高频带中具有较大的带宽和更高的灵敏度，但在8.36 GHz频段中未检测到这些爆发。银河闪烁无法解释这种效果，并且与先前的多波段实验一起清楚地表明，明显的爆发活性在很大程度上取决于正在观察到的射频带。
The spectra of repeating fast radio bursts (FRBs) are complex and time-variable, sometimes peaking within the observing band and showing a fractional emission bandwidth of about 10-30%. These spectral features may provide insight into the emission mechanism of repeating fast radio bursts, or they could possibly be explained by extrinsic propagation effects in the local environment. Broadband observations can better quantify this behavior and help to distinguish between intrinsic and extrinsic effects. We present results from a simultaneous 2.25 and 8.36 GHz observation of the repeating FRB 121102 using the 70 m Deep Space Network (DSN) radio telescope, DSS-43. During the 5.7 hr continuous observing session, we detected 6 bursts from FRB 121102, which were visible in the 2.25 GHz frequency band. However, none of these bursts were detected in the 8.36 GHz band, despite the larger bandwidth and greater sensitivity in the higher-frequency band. This effect is not explainable by Galactic scintillation and, along with previous multi-band experiments, clearly demonstrates that apparent burst activity depends strongly on the radio frequency band that is being observed.
