论文标题
在2 GHz时从重复的FRB 20201124a中检测出明亮的爆发
Detection of a bright burst from the repeating FRB 20201124A at 2 GHz
论文作者
论文摘要
我们对FRB 20201124a的明亮爆发进行了检测，该爆发是最活跃的重复FRB之一，基于S-Band观测值，该观测值是在Usuda Deep Spaci Center/jaxa的64米射电望远镜的S-BAND观测值。这是使用日本设施观察到的第一个FRB。我们在2022年2月2日在2 GHz的检测是此FRB的最高频率，而$> $ 189 JY MS的通量是该FRB来源最亮的爆发之一。我们从检测S频段和X频段的非检测中对光谱指数$α$ = -2.14放置上限。我们将检测到的爆发的事件速率与先前的研究的事件速率进行了比较，并建议在较低的频率下发光函数的幂律可能会损坏，而明亮的FRB的液体则与powerlaw抗频率相比，明亮的FRB的平均值最高为2 GHz。此外，我们显示了这项工作中检测到的爆发的能量密度与一次性FRB的明亮种群相当。我们建议重复的FRB可以像一次性的FRB一样明亮，并且只能检测到最明亮的爆发，因此某些重复的FRB本质上可能被归类为一次性的FRB。
We present a detection of a bright burst from FRB 20201124A, which is one of the most active repeating FRBs, based on S-band observations with the 64-m radio telescope at the Usuda Deep Space Center/JAXA. This is the first FRB observed by using a Japanese facility. Our detection at 2 GHz in February 2022 is the highest frequency for this FRB and the fluence of $>$ 189 Jy ms is one of the brightest bursts from this FRB source. We place an upper limit on the spectral index $α$ = -2.14 from the detection of the S band and non-detection of the X band at the same time. We compare an event rate of the detected burst with ones of the previous research, and suggest that the power-law of the luminosity function might be broken at lower fluence, and the fluences of bright FRBs distribute up to over 2 GHz with the power-law against frequency. In addition, we show the energy density of the burst detected in this work was comparable to the bright population of one-off FRBs. We propose that repeating FRBs can be as bright as one-off FRBs, and only their brightest bursts could be detected so some of repeating FRBs intrinsically might have been classified as one-off FRBs.
