G359.13142-0.20005：一个陡谱射电脉冲星候选体及其X射线对应体撞入银河系中心蛇形结构（G359.1-0.2）
G359.13142-0.20005: A steep spectrum radio pulsar candidate with an X-ray counterpart running into the Galactic Center Snake (G359.1-0.2)
AI总结：
本文通过Chandra、VLA和MeerKAT观测发现银河系中心蛇形结构主扭结处存在一个陡谱射电脉冲星候选体及其X射线对应体，提出该扭结由高速天体冲入并扭曲磁场结构所致，次扭结亦由其撞击诱发。
摘要：
蛇形结构（The Snake）是一条引人注目的银河系中心射电纤维，其形态特征是在其约20角分的延伸范围内存在两个扭结。主扭结和次扭结位于该纤维偏离垂直于银道面的线性磁化结构最严重的位置。我们展示了Chandra、VLA和MeerKAT的数据，并报告在主扭结位置探测到一个X射线和射电源。主扭结的高分辨率射电图像揭示出一个致密源，其具有陡峭谱，谱指数α约为-2.7，周围被延展发射包围。该致密源的射电光度和陡峭谱与脉冲星一致。我们还展示了沿蛇形结构远离主扭结位置处谱的平坦化和同步辐射发射率的增强，这表明相对论性粒子沿蛇形结构注入。我们认为主扭结是由一个快速运动（约500-1000 km/s）的天体冲入蛇形结构、扭曲其磁场结构并产生X射线发射而形成的。X射线发射精确定位了一个正在发生相互作用的活跃加速区。我们认为次扭结是由产生主扭结的高速天体的撞击所诱发。
英文摘要：
The Snake is a remarkable Galactic center radio filament with a morphology characterized by two kinks along its $\sim 20'$ extent. The major and minor kinks are located where the filament is most distorted from a linear magnetized structure running perpendicular to the Galactic plane. We present {\em Chandra}, VLA, and MeerKAT data and report the detection of an X-ray and radio source at the location of the major kink. High-resolution radio images of the major kink reveal a compact source with a steep spectrum with spectral index alpha ~ -2.7 surrounded by extended emission. The radio luminosity and steep spectrum of the compact source are consistent with a pulsar. We also show flattening of the spectrum and enhanced synchrotron emissivity away from the position of the major kink along the Snake, which suggests injection of relativistic particles along the Snake. We argue that the major kink is created by a fast-moving (~500-1000 km/s), object punching into the Snake, distorting its magnetic structure, and producing X-ray emission. X-ray emission pinpoints an active acceleration site where the interaction is taking place. A secondary kink is argued to be induced by the impact of the high-velocity object producing the major kink.
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