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arXiv 2302.07397astro-ph.HE
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磁星1 E 1547.0-5408的2022年高能爆发和射电消失行为

The 2022 high-energy outburst and radio disappearing act of the magnetar 1E 1547.0-5408

Marcus E. Lower, George Younes, Paul Scholz, Fernando Camilo, Liam Dunn, Simon Johnston, Teruaki Enoto, John M. Sarkissian, John E. Reynolds, David M. Palmer, Z… 展开作者

Marcus E. Lower, George Younes, Paul Scholz, Fernando Camilo, Liam Dunn, Simon Johnston, Teruaki Enoto, John M. Sarkissian, John E. Reynolds, David M. Palmer, Zaven Arzoumanian, Matthew G. Baring, Keith Gendreau, Ersin Göğüş, Sebastien Guillot, Alexander J. van der Horst, Chin-Ping Hu, Chryssa Kouveliotou, Lin Lin, Christian Malacaria, Rachael Stewart, Zorawar Wadiasingh

摘要:

我们报告了射电强磁星1 E 1547.0 $-$ 5408的射电和高能特性。在4月7日20时22分,Swift-BAT探测到来自源的短爆发之后,NICER的观测发现,在软X射线波段中,在$(6.0 \pm 0.4) \times 10^{-11}$ erg s $^{-1}$ cm $^{-2}$处的通量峰值增加,在17天的时间内下降到$1.7\times10^{-11}$ erg s $^{-1}$ cm $^{-2}$的基线水平。NICER和NuSTAR的联合光谱测量表明,尽管软X射线显著增加,但硬非热尾没有变化。使用64米帕克斯射电望远镜Murriyang进行的无线电波长观测显示,磁星的持续无线电发射至少在最初发现Swift-BAT之前22天消失,两周后重新发现。这种行为在无线电响亮的磁星中是前所未有的,可能表明在检测到短脉冲之前,高能量活动的缓慢上升被忽视。最后,我们结合无线电和X射线计时显示,爆发与自旋上升故障相吻合,其中自旋频率和自旋下降速率分别增加了$0.2 \pm 0.1$ $μ$ Hz和$(-2.4 \pm 0.1) \times 10^{-12}$ s $^{-2}$。在爆发后147天内,还观察到$(-2.0 \pm 0.1) \times 10^{-19}$ s $^{-3}$的自旋下降速率线性增加。我们的研究结果表明,爆发可能与准极场线的重新配置有关,可能是一个变化的扭曲信号,伴随着空间上更广泛的表面加热和无线电信号的短暂淬灭,但对硬X射线特性没有任何可测量的影响。

英文摘要:

We report the radio and high-energy properties of a new outburst from the radio-loud magnetar 1E 1547.0$-$5408. Following the detection of a short burst from the source with Swift-BAT on 2022 April 7, observations by NICER detected an increased flux peaking at $(6.0 \pm 0.4) \times 10^{-11}$ erg s$^{-1}$ cm$^{-2}$ in the soft X-ray band, falling to the baseline level of $1.7\times10^{-11}$ erg s$^{-1}$ cm$^{-2}$ over a 17-day period. Joint spectroscopic measurements by NICER and NuSTAR indicated no change in the hard non-thermal tail despite the prominent increase in soft X-rays. Observations at radio wavelengths with Murriyang, the 64-m Parkes radio telescope, revealed that the persistent radio emission from the magnetar disappeared at least 22 days prior to the initial Swift-BAT detection and was re-detected two weeks later. Such behavior is unprecedented in a radio-loud magnetar, and may point to an unnoticed slow rise in the high-energy activity prior to the detected short-bursts. Finally, our combined radio and X-ray timing revealed the outburst coincided with a spin-up glitch, where the spin-frequency and spin-down rate increased by $0.2 \pm 0.1$ $μ$Hz and $(-2.4 \pm 0.1) \times 10^{-12}$ s$^{-2}$ respectively. A linear increase in spin-down rate of $(-2.0 \pm 0.1) \times 10^{-19}$ s$^{-3}$ was also observed over 147 d of post-outburst timing. Our results suggest that the outburst may have been associated with a reconfiguration of the quasi-polar field lines, likely signalling a changing twist, accompanied by spatially broader heating of the surface and a brief quenching of the radio signal, yet without any measurable impact on the hard X-ray properties.

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