论文标题
无线电爆发磁铁SGR 1935+2154的X射线重新激活
The X-ray reactivation of the radio bursting magnetar SGR 1935+2154
论文作者
论文摘要
SGR J1935+2154在发现作为磁场的几年后，于2020年4月27日开始了新的爆发活动阶段，并伴随着其X射线持续发射的大量增强。在此激活期间检测到无线电单爆发，从而增强了磁铁和快速无线电爆发之间的连接。我们使用SWIFT，NUSTAR和更好的是在重新激活3周之前〜3天对SGR J1935+2154对SGR J1935+2154的X射线监测。我们在更好和nustar观测中检测到X射线脉动，并将自旋时期衍生物限制为| PDOT | <3e-11 s/s（3 Sigma C.L.）。脉冲轮廓显示出随时间和能量的函数在单峰和双向之间的变化形状切换。在〜10天内，脉冲分数从〜34％降至〜11％（5-10 KEV）。 X射线频谱通过吸收的黑体模型很好地拟合，温度从Kt〜1.6降低至0.45-0.6 KeV，加上与Nustar的非热成分（Gamma〜1.2）。 0.3-10 KEV X射线光度（6.6 kpc）在不到四天的时间内从〜6e33 ERG/s增加到约3E35 ERG/s，然后在爆发的接下三周内再次降至2.5E34 ERG/s。我们还检测到了几个X射线爆发，具有典型的短磁力爆发的特性。
A few years after its discovery as a magnetar, SGR J1935+2154 started a new burst-active phase on 2020 April 27, accompanied by a large enhancement of its X-ray persistent emission. Radio single bursts were detected during this activation, strengthening the connection between magnetars and fast radio bursts. We report on the X-ray monitoring of SGR J1935+2154 from ~3 days prior to ~3 weeks after its reactivation, using Swift, NuSTAR, and NICER. We detected X-ray pulsations in the NICER and NuSTAR observations, and constrained the spin period derivative to |Pdot| < 3e-11 s/s (3 sigma c.l.). The pulse profile showed a variable shape switching between single and double-peaked as a function of time and energy. The pulsed fraction decreased from ~34% to ~11% (5-10 keV) over ~10 days. The X-ray spectrum was well fit by an absorbed blackbody model with temperature decreasing from kT ~ 1.6 to 0.45-0.6 keV, plus a non-thermal component (Gamma ~ 1.2) observed up to ~25 keV with NuSTAR. The 0.3-10 keV X-ray luminosity (at 6.6 kpc) increased in less than four days from ~ 6e33 erg/s to about 3e35 erg/s and then decreased again to 2.5e34 erg/s over the following three weeks of the outburst. We also detected several X-ray bursts, with properties typical of short magnetar bursts.
