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arXiv 2004.06845astro-ph.HE
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FRB 121102的深空网双波段射电观测及多爆发探测

A Dual-band Radio Observation of FRB 121102 with the Deep Space Network and the Detection of Multiple Bursts

Walid A. Majid, Aaron B. Pearlman, Kenzie Nimmo, Jason W. T. Hessels, Thomas A. Prince, Charles J. Naudet, Jonathon Kocz, Shinji Horiuchi

摘要:

重复性快速射电暴(FRB)的频谱复杂且随时间变化,有时在观测波段内达到峰值,并显示出约10- 30%的部分发射带宽。这些光谱特征可以提供洞察重复快速射电暴的发射机制,或者它们可能被解释为在本地环境中的外部传播效应。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。我们提出的结果,同时从2.25和8.36 GHz的重复FRB 121102使用70米深空网(DSN)射电望远镜,DSS-43的观测。在5.7小时的连续观测期间,我们检测到来自FRB 121102的6个爆发,这些爆发在2.25 GHz频段可见。然而,在8.36 GHz频带中没有检测到这些突发,尽管在较高频带中具有较大的带宽和较高的灵敏度。这种效应是无法用银河闪烁来解释的,并且与以前的多波段实验一起,清楚地表明明显的爆发活动强烈地依赖于正在观察的射频波段。

英文摘要:

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.

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