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arXiv 2203.06994astro-ph.HE
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AT2020hur:一种可能的FRB 180916 B的光学对应物

AT2020hur: A Possible Optical Counterpart of FRB 180916B

Long Li, Qiao-Chu Li, Shu-Qing Zhong, Jie Xia, Lang Xie, Fa-Yin Wang, Zi-Gao Dai

摘要:

快速射电暴(FRB)的物理起源仍不清楚。找到FRB的多波长对应物可能是理解其性质的突破。在这项工作中,我们进行了系统的搜索天文瞬变(AT)的位置是一致的FRB。我们发现了一个未分类的光学瞬态AT 2020 hur($α=01^{\mathrm{h}} 58^{\mathrm{m}} 00.750^{\mathrm{s}} \pm 1$ arcsec,$δ=65^{\circ} 43^{\prime} 00.30^{\prime \prime} \pm 1$ arcsec),它与重复的FRB 180916 B($α=01^{\mathrm{h}} 58^{\mathrm{m}} 00.7502^{\mathrm{s}} \pm 2.3$ mas,$δ=65^{\circ} 43^{\prime} 00.3152^{\prime \prime} \pm 2.3$ mas)在空间上一致。AT 2020 hur-FRB 180916 B关联的偶然可能性约为0.04%,其对应于$3.5σ$的显著性。我们建立了一个适合AT 2020 hur的巨型耀斑余辉模型。虽然巨耀斑余辉模型可以解释AT 2020 hur的观测结果,但其导出的动能比典型的巨耀斑要大至少3个数量级,而且模型需要大量的微调和符合。另一种可能的解释是,AT 2020 hur可能是由两个或多个来自FRB源的光学耀斑组成,例如FRB辐射的逆康普顿散射产生的快速光学爆发。此外,AT 2020 hur位于FRB 180916 B的活动窗口之一,这是对关联的独立支持。这种重合可能是由于光学对应物受到与FRB 180916 B相同的周期性调制的原因,如提示FRB对应物所暗示的。未来对FRB及其光学对应物的同时观测可能有助于揭示它们的物理起源。

英文摘要:

The physical origin of fast radio bursts (FRBs) remains unclear. Finding multiwavelength counterparts of FRBs can be a breakthrough in understanding their nature. In this work, we perform a systematic search for astronomical transients (ATs) whose positions are consistent with FRBs. We find an unclassified optical transient AT2020hur ($α=01^{\mathrm{h}} 58^{\mathrm{m}} 00.750^{\mathrm{s}} \pm 1$ arcsec, $δ=65^{\circ} 43^{\prime} 00.30^{\prime \prime} \pm 1$ arcsec) that is spatially coincident with the repeating FRB 180916B ($α=01^{\mathrm{h}} 58^{\mathrm{m}} 00.7502^{\mathrm{s}} \pm 2.3$ mas, $δ=65^{\circ} 43^{\prime} 00.3152^{\prime \prime} \pm 2.3$ mas). The chance possibility for the AT2020hur-FRB 180916B association is about 0.04%, which corresponds to a significance of $3.5σ$. We develop a giant flare afterglow model to fit AT2020hur. Although the giant flare afterglow model can interpret the observations of AT2020hur, the derived kinetic energy of such a GF is at least three orders of magnitude larger than that of the typical GF, and there is a lot of fine tuning and coincidences required for this model. Another possible explanation is that AT2020hur might consist of two or more optical flares originating from the FRB source, e.g. fast optical bursts produced by the inverse Compton scattering of FRB emission. Besides, AT2020hur is located in one of the activity windows of FRB 180916B, which is an independent support for the association. This coincidence may be due to the reason that the optical counterpart is subject to the same periodic modulation as FRB 180916B, as implied by the prompt FRB counterparts. Future simultaneous observations of FRBs and their optical counterparts may help reveal their physical origin.

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。

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