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Do All Fast Radio Bursts Repeat? Constraints from CHIME/FRB Far Side-Lobe FRBs

ASTROPHYSICAL JOURNAL(2024)

Acad Sinica | Univ Toronto | Carnegie Mellon Univ | Univ Amsterdam | McGill Univ | CALTECH | Yale Univ | Tata Inst Fundamental Res | West Virginia Univ | Univ Chile | Univ British Columbia | Univ Wisconsin Madison | MIT | Curtin Univ | Sidrat Res | Natl Radio Astron Observ | Perimeter Inst Theoret Phys | Simon Fraser Univ

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Abstract
We report 10 fast radio bursts (FRBs) detected in the far sidelobe region (i.e., >= 5 degrees off-meridian) of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) from August 28 2018 to August 31 2021. We localize the bursts by fitting their spectra with a model of the CHIME/FRB synthesized beam response. We find that the far sidelobe events have on average similar to 500 times greater fluxes than events detected in CHIME's main lobe. We show that the sidelobe sample is therefore statistically similar to 20 times closer than the main lobe sample. We find promising host galaxy candidates (P-cc<1%) for two of the FRBs, 20190112B and 20210310B, at distances of 38 and 16 Mpc, respectively. CHIME/FRB did not observe repetition of similar brightness from the uniform sample of 10 sidelobe FRBs in a total exposure time of 35,580 hr. Under the assumption of Poisson-distributed bursts, we infer that the mean repetition interval above the detection threshold of the far sidelobe events is longer than 11,880 hr, which is at least 2380 times larger than the interval from known CHIME/FRB detected repeating sources, with some caveats, notably that very narrowband events could have been missed. Our results from these far sidelobe events suggest one of two scenarios: either (1) all FRBs repeat and the repetition intervals span a wide range, with high-rate repeaters being a rare sub-population, or (2) non-repeating FRBs are a distinct population different from known repeaters.
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High energy astrophysics,Radio transient sources,Radio bursts,Neutron stars,Time domain astronomy,Extragalactic astronomy
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要点】:研究利用CHIME望远镜的远旁瓣区域数据,发现10个快速射电暴(FRBs)事件,未观测到这些事件的重复现象,从而推测FRBs的重复间隔可能非常长或者存在不重复的FRB子群体。

方法】:通过拟合CHIME/FRB合成束响应模型对FRB事件进行定位,并分析其流量和距离。

实验】:在2018年8月28日至2021年8月31日期间,对CHIME远旁瓣区域进行监测,共检测到10个FRB事件,使用的数据集为CHIME望远镜的观测数据,结果显示侧瓣事件的流量比主瓣区域的事件平均高出约500倍,且未观察到重复现象。