论文标题
SGR1935+2154 SGR爆发中可能的周期性窗口行为
Possible Periodic Windowed Behavior in SGR1935+2154 SGR Bursts
论文作者
论文摘要
在FRB检测时代，两个重复的FRB来源，分别是FRB180916（Chime/FRB协作，2020a）和FRB121102（Rajwade等，2020，Cruces等，2021），显示周期性窗口行为（PWB）。在PWB中，事件仅发生在该期间一定一部分的周期性窗口内发生，但是在许多时期内都不会发生任何事件。在2020年4月28日UT期间，从软伽玛中继器（SGR）1935+2154鉴定出了两个软伽马爆发（Li等，2021）的两个峰（Li等，2021）。由于SGR是一种磁性，因此这些观察结果至少在某些FRB和磁铁之间建立了联系。此处选择给出最小窗口分数的周期的分析显示了该源软伽马射线发射中的PWB。从2014年到2020年从IPN（星际网络）仪器进行161次爆发，在231 +/- 9天期间，窗口分数与周期的最小解析和55 \％的窗口分数发生。数据仅涵盖了6集，但是，周期性结果似乎相对健壮：首先，IPN具有出色的时间覆盖范围，并且不太可能错过这些窗口之外的爆发。其次，对于各种数据子集（爆发较少），即使在取消最丰富的爆发发作的子样本中，最佳或第二最佳测量周期也与231天一致。此外，模拟表明，即使是少数均匀的随机爆发也不显示PWB，并且结果并不是由于采样有限。明显的普华永道可能有其他解释。但是，在观察到更一致的发作之后，PWB的坚定结论将是显而易见的。如果可以验证此SGR爆发的周期性，并且在其他重复的FRB源中观察到了相似的行为，则可能表明FRB和SGR爆发机制或发射条件之间存在联系。
Two repeating FRB sources, FRB180916 (CHIME/FRB Collaboration, 2020a) and FRB121102 (Rajwade, et al., 2020, Cruces, et al., 2021) display periodic windowed behavior (PWB) in the times of FRB detections. In PWB, events only occur within a periodic window spanning some fraction of the period, but no events may occur during many of the periods. During UT 2020 April 28, two peaks of a soft gamma burst (Li, et al., 2021) were identified with two FRB peaks (CHIME/FRB Collaboration, et al., 2020b) from soft gamma repeater (SGR) 1935+2154. As SGRs are a type of magnetar, these observations establish a link between at least some FRBs and magnetars. The analysis herein, which selects the period giving the minimum window fraction, shows PWB in this source's soft gamma-ray emission. For 161 bursts from 2014 through 2020 from IPN (Interplanetary Network) instruments, a clearly resolved minimum in window fraction vs. period occurs at a 231 +/- 9 day period, and 55 \% window fraction. The data cover only 6 bursting episodes, however, the periodicity result appears relatively robust: First, the IPN has excellent time coverage and is unlikely to miss bursts outside of these windows. Second, for various data subsets (with significantly less bursts), either the best or second best measured period was consistent with 231 days, even in the sub-sample with the richest bursting episode removed. In addition, simulations show that even small numbers of uniform random bursts do not show PWB, and that the results are not due to limited sampling. The apparent PWB could have alternative explanations; a firm conclusion of PWB would be evident, however, after the observation of more consistent episodes. If the periodicity of this SGR's bursts can be verified, and if similar behavior were observed in other repeating FRB sources, it might suggest a linkage between FRB and SGR burst mechanisms or emission conditions.
