标题： 来自Gemini-N/'Alopeke高速成像的重复FRB 20180916B光学对应体的限制 显示英文标题

标题： Limits on Optical Counterparts to the Repeating FRB 20180916B from High-speed Imaging with Gemini-N/'Alopeke

摘要： 我们报告了来自双重复快速射电暴（FRB）20180916B的光学观测结果，这些观测是在Gemini北望远镜上的'Alopeke相机上进行的，涉及两个重复暴发（FRB 20201023和FRB 20220908），时间尺度约为10毫秒。这两个重复暴发的射电通量分别为2.8和3.5 Jy ms，分别大约位于该重复暴发通量的下50百分位数。'Alopeke数据在FRB位置未发现显著的光学探测，并在修正视线消光后，将光学通量的3σ上限分别限制为<8.3e-3和<7.7e-3 Jy ms。结合这些结果，在这些时间尺度上，快速射电暴的光学到射电通量比值的最敏感限制为η < 3e-3，提高了约一个数量级。这些测量排除了FRB 20180916B与类似蟹状星云脉冲星的通量比相似的起源模型，以及光学辐射是由脉冲星磁层或年轻超新星遗迹中的逆康普顿辐射产生的模型。我们使用Gemini-N上的'Alopeke相机的持续计划将继续监测重复快速射电暴，包括FRB 20180916B，以在毫秒时间尺度上寻找光学对应体。 显示英文摘要

摘要： We report on contemporaneous optical observations at ~10 ms timescales from the fast radio burst (FRB) 20180916B of two repeat bursts (FRB 20201023, FRB 20220908) taken with the 'Alopeke camera on the Gemini North telescope. These repeats have radio fluences of 2.8 and 3.5 Jy ms, respectively, approximately in the lower 50th percentile for fluence from this repeating burst. The 'Alopeke data reveal no significant optical detections at the FRB position and we place 3-sigma upper limits to the optical fluences of <8.3e-3 and <7.7e-3 Jy ms after correcting for line-of-sight extinction. Together, these yield the most sensitive limits to the optical-to-radio fluence ratio of an FRB on these timescales with eta < 3e-3 by roughly an order of magnitude. These measurements rule out progenitor models where FRB 20180916B has a similar fluence ratio to optical pulsars similar to the Crab pulsar or optical emission is produced as inverse Compton radiation in a pulsar magnetosphere or young supernova remnant. Our ongoing program with 'Alopeke on Gemini-N will continue to monitor repeating FRBs, including FRB 20180916B, to search for optical counterparts on ms timescales.