论文标题

332 MHz调查的吸收限制快速无线电爆发

Limits on Absorption from a 332-MHz survey for Fast Radio Bursts

论文作者

Rajwade, K. M., Mickaliger, M. B., Stappers, B. W., Bassa, C. G., Breton, R. P., Karastergiou, A., Keane, E. F.

论文摘要

快速无线电爆发(FRB)是明亮的,外层次的无线电脉冲,其起源仍然未知。直到最近,大多数FRB都以大于1 GHz的频率检测到,有少数例外,为800 MHz。从加拿大氢强度映射实验(Chime)望远镜中,FRB的最新发现以400 MHz的形式发现了有关祖细胞的新见解的可能性,而过去许多其他低频调查未能找到任何FRB。在这里,我们介绍了最近在332 MHz的Jodrell Bank天文台进行的FRB调查的结果,其中76米Lovell望远镜总共58天。我们没有检测到调查中的任何FRB,并报告了90美元$ \%$上限为每天5500 FRB,对于46 JY MS的欧几里得宇宙,每天的欧几里得宇宙上的欧几里得宇宙。我们讨论吸收可能是低频(<800 MHz)搜索的非潜在原因的主要原因,并调用了不同的吸收模型以解释相同。我们发现,仅诱导的康普顿散射无法解释无线电发射的吸收,并且我们的模拟有利于诱导的康普顿散射和无自由吸收的结合来解释非探测。对于自由吸收的情况,我们对电子密度的约束与超露水超级新星(SLSNE)中电离喷射后的震后区域的预期一致。

Fast Radio Bursts (FRBs) are bright, extragalactic radio pulses whose origins are still unknown. Until recently, most FRBs have been detected at frequencies greater than 1 GHz with a few exceptions at 800 MHz. The recent discoveries of FRBs at 400 MHz from the Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope has opened up possibilities for new insights about the progenitors while many other low frequency surveys in the past have failed to find any FRBs. Here, we present results from a FRB survey recently conducted at the Jodrell Bank Observatory at 332 MHz with the 76-m Lovell telescope for a total of 58 days. We did not detect any FRBs in the survey and report a 90$\%$ upper limit of 5500 FRBs per day per sky for a Euclidean Universe above a fluence threshold of 46 Jy ms. We discuss the possibility of absorption as the main cause of non-detections in low frequency (< 800 MHz) searches and invoke different absorption models to explain the same. We find that Induced Compton Scattering alone cannot account for absorption of radio emission and that our simulations favour a combination of Induced Compton Scattering and Free-Free Absorption to explain the non-detections. For a free-free absorption scenario, our constraints on the electron density are consistent with those expected in the post-shock region of the ionized ejecta in Super-Luminous SuperNovae (SLSNe).

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