CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources
CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources
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DOI：
10.3847/1538-4357/acc6c1
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发表时间：
2023-01
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通讯作者：
T. C. C. B. C. Andersen-T.-C.-C.-B.-C.-Andersen-1388770440;K. Bandura;M. Bhardwaj;P. Boyle;C. Brar;T. Cassanelli;S. Chatterjee;P. C
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作者：
T. C. C. B. C. Andersen-T.-C.-C.-B.-C.-Andersen-1388770440;K. Bandura;M. Bhardwaj;P. Boyle;C. Brar;T. Cassanelli;S. Chatterjee;P. C
我们在2019年9月30日至2021年5月1日期间探测到的CHAME/FRB事件中发现了25个新的重复快速射电爆发(FRB)源。这些源是使用一种新的聚类算法找到的，该算法寻找位于天空中具有相似弥散度量(DM)的多个事件。新的中继器具有从∼220到∼1700 PC cm−3的DM，并且包括表现出从两个脉冲串到多达十二个脉冲串的信号源。我们报告了重复来源和明显不重复来源的Dm和河外Dm(EDM)的分布在统计学上的显著差异，中继者的Dm和EDM的平均值较低，我们讨论了其意义。在对灵敏度和曝光效应进行校正后，我们发现中继器的重复频率和来自明显不重复的源的重复上限之间没有明显的双峰关系，尽管一些活跃的重复源是异常的。我们随着时间的推移测量了中继器的比例，发现到目前为止，它在我们的总天空时间中趋于2.6%−2.6%+2.9%的平衡。我们还报道了另外14个消息来源，这些消息来源有望重复出现FRB候选人，值得后续观察以确认。
We present the discovery of 25 new repeating fast radio burst (FRB) sources found among CHIME/FRB events detected between 2019 September 30 and 2021 May 1. The sources were found using a new clustering algorithm that looks for multiple events colocated on the sky having similar dispersion measures (DMs). The new repeaters have DMs ranging from ∼220 to ∼1700 pc cm−3, and include sources having exhibited as few as two bursts to as many as twelve. We report a statistically significant difference in both the DM and extragalactic DM (eDM) distributions between repeating and apparently nonrepeating sources, with repeaters having a lower mean DM and eDM, and we discuss the implications. We find no clear bimodality between the repetition rates of repeaters and upper limits on repetition from apparently nonrepeating sources after correcting for sensitivity and exposure effects, although some active repeating sources stand out as anomalous. We measure the repeater fraction over time and find that it tends to an equilibrium of 2.6−2.6+2.9 % over our total time-on-sky thus far. We also report on 14 more sources, which are promising repeating FRB candidates and which merit follow-up observations for confirmation.