Periodic activity from a fast radio burst source

Periodic activity from a fast radio burst source
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DOI:
10.1038/s41586-020-2398-2
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发表时间:
2020-06-18
期刊:
影响因子:
64.8
通讯作者:
Zwaniga, A. V.
Zwaniga, A. V.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Amiri, M.;Andersen, B. C.;Zwaniga, A. V.

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快速射电爆发 (FRB) 是明亮的、持续时间为毫秒的射电瞬变,源自河外距离 (1),其来源尚不清楚。一些 FRB 源会重复爆发,从而排除了这些事件的灾难性起源(2-4)。尽管在从毫秒到许多天(2,5-7)的时间尺度上搜索重复爆发到达时间的周期性,但迄今为止观察到这些爆发是零星出现的,并且尽管是聚集的(8),但没有规则的模式。在此,我们报告了加拿大氢强度测绘实验快速射电爆发项目 (4,9) 检测到的重复 FRB 180916.J0158+65 的 16.35 +/- 0.15 天周期性(或可能是该周期性的更高频率别名)的观测结果。在 2018 年 9 月 16 日至 2020 年 2 月 4 日(世界标准时间)记录的 38 个爆发中,我们发现所有爆发都在 5 天的相位窗口内到达,50% 的爆发在 0.6 天的相位窗口内到达。我们的结果提出了一种对突发发射本身或通过外部放大或吸收进行周期性调制的机制,并且不赞成调用纯粹零星过程的模型。
Fast radio bursts (FRBs) are bright, millisecond-duration radio transients originating from sources at extragalactic distances(1), the origin of which is unknown. Some FRB sources emit repeat bursts, ruling out cataclysmic origins for those events(2-4). Despite searches for periodicity in repeat burst arrival times on timescales from milliseconds to many days(2,5-7), these bursts have hitherto been observed to appear sporadically and-although clustered(8)-without a regular pattern. Here we report observations of a 16.35 +/- 0.15 day periodicity (or possibly a higher-frequency alias of that periodicity) from the repeating FRB 180916.J0158+65 detected by the Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst Project(4,9). In 38 bursts recorded from 16 September 2018 to 4 February 2020 utc, we find that all bursts arrive in a five-day phase window, and 50 per cent of the bursts arrive in a 0.6-day phase window. Our results suggest a mechanism for periodic modulation either of the burst emission itself or through external amplification or absorption, and disfavour models invoking purely sporadic processes.