从煎锅超新星残骸中伸出的极端脉冲星尾巴
An Extreme Pulsar Tail Protruding from the Frying Pan Supernova Remnant
摘要：
煎锅（G315.9-0.0）是一个射电超新星遗迹，有一个特殊的线状特征（G315.78-0.23），从壳的边缘向外放射状延伸10'。我们目前的无线电成像和偏振观测从莫隆格洛天文台合成望远镜和澳大利亚望远镜紧凑阵列，确认G315.78-0.23作为弓激波脉冲星风星云（PWN）的年轻脉冲星J1437-5959。这是射电观测到的最长的脉冲星尾之一，它的物理范围超过20 pc。我们发现弓形激波的间隔距离为0.002秒差距，在类似系统中是最小的，这表明脉冲星的速度超过1000 km/s，马赫数马赫数，约为200。从无线电偏振测量推断的磁场几何形状显示出与尾部方向的良好对准，这可能是高流速的结果。也有迹象表明，震后风的磁化强度较低，主要由电子和正电子的能量所控制。这项研究表明，PWNe可以提供一个强大的探测他们的当地环境，特别是对于弓激波的情况下，父母超新星壳也被检测到。
英文摘要：
The Frying Pan (G315.9-0.0) is a radio supernova remnant with a peculiar linear feature (G315.78-0.23) extending 10' radially outward from the rim of the shell. We present radio imaging and polarization observations obtained from the Molonglo Observatory Synthesis Telescope and the Australia Telescope Compact Array, confirming G315.78-0.23 as a bow-shock pulsar wind nebula (PWN) powered by the young pulsar J1437-5959. This is one of the longest pulsar tails observed in radio and it has a physical extent over 20 pc. We found a bow-shock stand-off distance of 0.002 pc, smallest among similar systems, suggesting a large pulsar velocity over 1000 km/s and a high Mach number ~200. The magnetic field geometry inferred from radio polarimetry shows a good alignment with the tail orientation, which could be a result of high flow speed. There are also hints that the postshock wind has a low magnetization and is dominated by electrons and positrons in energy. This study shows that PWNe can offer a powerful probe of their local environment, particularly for the case of a bow shock where the parent supernova shell is also detected.
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