论文标题
SGR J1935+2154的持续发射特性在其2020年活动情节中
Persistent Emission Properties of SGR J1935+2154 During Its 2020 Active Episode
论文作者
论文摘要
我们根据我们的XMM-Newton和Chandra观察结果，介绍了SGR J1935+2154持续的X射线发射的详细光谱和时间特性，该光谱和时间特征是在2020年4月的XMM-NEWTON和CHANDRA观察中进行的，在其2020年4月的爆发暴风雨后进行，在此期间，发出了数百次充满活力的X射线爆发，其中包括与非凡的快速无线电爆发。我们清楚地检测到XMM-Newton数据中的脉冲X射线发射。使用我们的旋转期测量结果与从同一活动情节报告的三个较早的值相结合，获得了1.6 $ \ times $ 10 $^{ - 11} $ s $ s $^{ - 1} $的平均旋转率。我们对具有多种现象学和物理动机模型的XMM-Newton和Chandra光谱的研究得出的结论是，SGR J1935+2154的磁场拓扑很可能是高度非二色的。光谱模型表明，从与旋转磁偶极子相关的旋转扭矩中推断出的某种局部局部区域的表面场强度大大超过了4.4 $ \ times $ 10 $^{14} $ g的极性值。
We present detailed spectral and temporal characteristics of the persistent X-ray emission of SGR J1935+2154 based on our XMM-Newton and Chandra observations taken in the aftermath of its April 2020 burst storm, during which hundreds of energetic X-ray bursts were emitted, including one associated with an extraordinary fast radio burst. We clearly detect the pulsed X-ray emission in the XMM-Newton data. An average spin-down rate of 1.6$\times$10$^{-11}$ s s$^{-1}$ is obtained using our spin period measurement combined with three earlier values reported from the same active episode. Our investigations of the XMM-Newton and Chandra spectra with a variety of phenomenological and physically-motivated models, concluded that the magnetic field topology of SGR J1935+2154 is most likely highly non-dipolar. The spectral models indicate that surface field strengths in somewhat localized regions substantially exceed the polar value of 4.4$\times$10$^{14}$ G inferred from a spin-down torque associated with a rotating magnetic dipole.
