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arXiv 2402.09291astro-ph.HE
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磁星快速射电暴周围的快速自转变化

Rapid spin changes around a magnetar fast radio burst

Chin-Ping Hu, Takuto Narita, Teruaki Enoto, George Younes, Zorawar Wadiasingh, Matthew G. Baring, Wynn C. G. Ho, Sebastien Guillot, Paul S. Ray, Tolga Guver, Ka… 展开作者

Chin-Ping Hu, Takuto Narita, Teruaki Enoto, George Younes, Zorawar Wadiasingh, Matthew G. Baring, Wynn C. G. Ho, Sebastien Guillot, Paul S. Ray, Tolga Guver, Kaustubh Rajwade, Zaven Arzoumanian, Chryssa Kouveliotou, Alice K. Harding, Keith C. Gendreau

AI总结:

本研究报告了磁星SGR 1935+2154在快速射电暴前后约9小时内发生的双自转突变,揭示了磁层风导致自转减慢并可能触发FRB的机制。

摘要:

磁星是具有极高磁场的中子星,表现出各种X射线现象,如偶发的亚秒级爆发、长期的持续通量增强以及自转周期变化率的变化。2020年,从银河系磁星SGR 1935+2154探测到一次快速射电暴(FRB),类似于宇宙学毫秒级射电暴,证实了长久以来怀疑的某些FRB与磁星之间的关联。然而,磁星中FRB的产生机制仍不清楚。在此,我们报告了在约9小时的时间间隔内,SGR 1935+2154的X射线发现了一次前所未有的双自转突变,该突变发生在2022年10月14日的一次FRB前后。每次突变都涉及磁星自转频率的显著增加,这是中子星自转有史以来观测到的最大突变之一。在两次突变之间,磁星表现出快速的自转减慢阶段,伴随着其持续X射线发射和爆发率的显著增加及随后的下降。我们推测,一种强烈的短暂磁层风提供了使恒星自转迅速减慢的力矩。第一次突变的触发将恒星壳层与其磁层耦合,增强了各种X射线信号,并催生了改变磁层条件从而可能产生FRB的风。

英文摘要:

Magnetars are neutron stars with extremely high magnetic fields that exhibit various X-ray phenomena such as sporadic sub-second bursts, long-term persistent flux enhancements, and variable rates of rotation period change. In 2020, a fast radio burst (FRB), akin to cosmological millisecond-duration radio bursts, was detected from the Galactic magnetar SGR 1935+2154, confirming the long-suspected association between some FRBs and magnetars. However, the mechanism for FRB generation in magnetars remains unclear. Here we report the X-ray discovery of an unprecedented double glitch in SGR 1935+2154 within a time interval of approximately nine hours, bracketing an FRB that occurred on October 14, 2022. Each glitch involved a significant increase in the magnetar's spin frequency, being among the largest abrupt changes in neutron star rotation ever observed. Between the glitches, the magnetar exhibited a rapid spin-down phase, accompanied by a profound increase and subsequent decline in its persistent X-ray emission and burst rate. We postulate that a strong, ephemeral, magnetospheric wind provides the torque that rapidly slows the star's rotation. The trigger for the first glitch couples the star's crust to its magnetosphere, enhances the various X-ray signals, and spawns the wind that alters magnetospheric conditions that might produce the FRB.

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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