arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2202.08002astro-ph.HE
收藏

具有亚毫秒准周期结构的快速射电暴

A fast radio burst with sub-millisecond quasi-periodic structure

Inés Pastor-Marazuela, Joeri van Leeuwen, Anna Bilous, Liam Connor, Yogesh Maan, Leon Oostrum, Emily Petroff, Samayra Straal, Dany Vohl, E. A. K. Adams, B. Adeb… 展开作者

Inés Pastor-Marazuela, Joeri van Leeuwen, Anna Bilous, Liam Connor, Yogesh Maan, Leon Oostrum, Emily Petroff, Samayra Straal, Dany Vohl, E. A. K. Adams, B. Adebahr, Jisk Attema, Oliver M. Boersma, R. van den Brink, W. A. van Cappellen, A. H. W. M. Coolen, S. Damstra, H. Dénes, K. M. Hess, J. M. van der Hulst, B. Hut, A. Kutkin, G. Marcel Loose, D. M. Lucero, Á. Mika, V. A. Moss, H. Mulder, M. J. Norden, T. A. Oosterloo, Kaustubh Rajwade, D. van der Schuur, A. Sclocco, R. Smits, J. Ziemke

AI总结:

本文报告发现具有0.415毫秒准周期结构的FRB 20201020A,其周期性为2.5σ边缘显著,排除了中子星自转和双星并合,支持磁星磁层等距发射区解释。

摘要:

快速射电暴(FRBs)是河外星系中具有非凡亮度的射电瞬变源。研究近期在多个FRB中观测到的多样时间与光谱行为,可能有助于确定整个类别的本质。例如,快速自转或强磁化的中子星可能产生解释明亮发射所需的自转供能加速。近期在一个FRB中报道了周期性的亚秒级分量,暗示这种自转,并可能在另外两个FRB中也有发现。在此,我们报告使用Apertif发现FRB 20201020A,该FRB显示出五个间隔为0.415毫秒的规则分量。FRB 20201020A中的这种亚毫秒结构为这个FRB的前身星提供了重要线索,并可能为一般FRB的前身星提供线索。因此,我们将其特征与主要FRB源模型的预测进行对比。我们对FRB 20201020A的分量进行计时分析,以确定周期性的显著性。我们将这些结果与先前报道的具有亚秒级准周期分量的CHIME FRB的计时特性,以及来自重复FRB 20180916B的两次Apertif暴发(显示出复杂的时间-频率结构)进行比较。我们发现FRB 20201020A的周期性的显著性为2.5σ,属于边缘显著。其重复的子分量不能解释为脉冲星自转,因为所需的自转速率超过2千赫兹,超出了典型中子星状态方程和观测所设定的限制。这种快速周期性也与致密天体并合情景相冲突。然而,这些准周期分量可能是由磁星磁层中等距的发射区域引起的。FRB 20201020A中分量的亚毫秒间隔,是迄今在一次非重复FRB中观测到的最小间隔,可能排除了中子星自转和双星并合作为准周期FRB直接来源的可能性。

英文摘要:

Fast radio bursts (FRBs) are extragalactic radio transients of extraordinary luminosity. Studying the diverse temporal and spectral behaviour recently observed in a number of FRBs may help determine the nature of the entire class. For example, a fast spinning or highly magnetised neutron star might generate the rotation-powered acceleration required to explain the bright emission. Periodic, sub-second components, suggesting such rotation, were recently reported in one FRB, and potentially in two more. Here we report the discovery of FRB 20201020A with Apertif, an FRB showing five components regularly spaced by 0.415 ms. This sub-millisecond structure in FRB 20201020A carries important clues about the progenitor of this FRB specifically, and potentially about that of FRBs in general. We thus contrast its features to the predictions of the main FRB source models. We perform a timing analysis of the FRB 20201020A components to determine the significance of the periodicity. We compare these against the timing properties of the previously reported CHIME FRBs with sub-second quasi-periodic components, and against two Apertif bursts from repeating FRB 20180916B that show complex time-frequency structure. We find the periodicity of FRB 20201020A to be marginally significant at 2.5$σ$. Its repeating subcomponents cannot be explained as a pulsar rotation since the required spin rate of over 2 kHz exceeds the limits set by typical neutron star equations of state and observations. The fast periodicity is also in conflict with a compact object merger scenario. These quasi-periodic components could, however, be caused by equidistant emitting regions in the magnetosphere of a magnetar. The sub-millisecond spacing of the components in FRB 20201020A, the smallest observed so far in a one-off FRB, may rule out both neutron-star rotation and binary mergers as the direct source of quasi-periodic FRBs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑