Faint Repetitions from a Bright Fast Radio Burst Source-猫眼课题宝

DOI：

10.3847/2041-8213/ab5b08

发表时间：

2019-08

期刊：

The Astrophysical Journal Letters

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

Pravir Kumar;Ryan M. Shannon;S. Osłowski;H. Qiu;H. Qiu;S. Bhandari;W. Farah;C. Flynn;M. Kerr;D. Lorimer;J. Macquart;C. Ng;Chris Phillips;Danny C. Price;Danny C. Price;R. Spiewak

我们报告的检测重复爆发的FRB 171019，在澳大利亚平方公里阵列探路者（ASKAP）苍蝇的眼睛调查中检测到的最明亮的快速射电爆发（FRB）的源。绿色银行望远镜在以820兆赫为中心的观测中探测到了两次爆发。这些重复比ASKAP发现的爆发要微弱590倍。来自这个源的所有三个爆发都没有显示出散射的证据，并且具有一致的脉冲宽度。脉冲光谱显示调制，这可能是陡峭的光谱或斑片状发射的证据。这两个重复是唯一的发现，在一个观测活动，为这个FRB共计1000小时，其中还包括ASKAP和64米帕克斯射电望远镜，在一个频率范围（720-2000兆赫）在历元跨越两年。推断的重复率与该源的注量的比例与另一个重复源FRB 121102一致。对FRB 171019微弱脉冲的探测表明，如果用更灵敏的望远镜进行后续观测，至少有一些从明亮样本中选出的FRB会重复出现。

We report the detection of repeat bursts from the source of FRB 171019, one of the brightest fast radio bursts (FRBs) detected in the Australian Square Kilometre Array Pathfinder (ASKAP) fly’s eye survey. Two bursts from the source were detected with the Green Bank Telescope in observations centered at 820 MHz. The repetitions are a factor of ∼590 fainter than the ASKAP-discovered burst. All three bursts from this source show no evidence of scattering and have consistent pulse widths. The pulse spectra show modulation that could be evidence for either steep spectra or patchy emission. The two repetitions were the only ones found in an observing campaign for this FRB totaling 1000 hr, which also included ASKAP and the 64 m Parkes radio telescope, over a range of frequencies (720–2000 MHz) at epochs spanning two years. The inferred scaling of repetition rate with fluence of this source agrees with the other repeating source, FRB 121102. The detection of faint pulses from FRB 171019 shows that at least some FRBs selected from bright samples will repeat if follow-up observations are conducted with more sensitive telescopes.

Faint Repetitions from a Bright Fast Radio Burst Source

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