在疑似银河系SN Iax残余Pa 30中发现与1181历史客星CE有关的异常光学星云
Discovery of an Exceptional Optical Nebulosity in the Suspected Galactic SN Iax Remnant Pa 30 Linked to the Historical Guest Star of 1181 CE
摘要：
新近发现的一个年轻的银河系SN遗迹Pa 30（G123.1+4.6）位于一颗风速约为16，000 km/s的热中心星上，最近被认为是双简并的结果，导致了与1181 CE的客星有关的SN Iax事件。在这里，我们展示了Pa 30的深光学[S II] 6716，6731图像，显示了一个直径170”的非凡和高度结构化的星云，具有数十个长的（5”- 20”）径向排列的细丝，其会聚点靠近热的中央恒星。丝状体的光谱表明，其膨胀速度峰值约为1100 km/s，电子密度在100 ~ 700 cm^-3之间，其厚壳状结构与22微米WISE图像中的外观相似。没有观测到H-α发射（I[6716/H-alpha] >5），唯一检测到的另一条发射线是微弱的[Ar III] 7136，表明这是一个富含S、Ar但缺乏H的残留物。该星云的角大小，估计2.3 kpc的距离，和1100 km/s的膨胀速度与1181 CE左右的爆炸日期一致。残骸的不寻常外观可能是由于中央恒星的高光度风引起的团风相互作用导致的风驱动喷出物的光电离。
英文摘要：
A newly recognized young Galactic SN remnant, Pa 30 (G123.1+4.6), centered on a hot central star with a ~16,000 km/s wind velocity has recently been proposed to be the result of a double-degenerate merger leading to a SN Iax event associated with the guest star of 1181 CE. Here we present deep optical [S II] 6716,6731 images of Pa 30 which reveal an extraordinary and highly structured nebula 170" in diameter with dozens of long (5" - 20") radially aligned filaments with a convergence point near the hot central star. Optical spectra of filaments indicate a peak expansion velocity ~1100 km/s with electron densities of <100 to 700 cm^-3, and a thick shell-like structure resembling its appearance in 22 micron WISE images. No H-alpha emission was seen (I[6716/H-alpha] >5), with the only other line emission detected being faint [Ar III] 7136 suggesting a S, Ar-rich but H-poor remnant. The nebula's angular size, estimated 2.3 kpc distance, and 1100 km/s expansion velocity are consistent with an explosion date around 1181 CE. The remnant's unusual appearance may be due to the photoionization of wind-driven ejecta due to clump-wind interactions caused by the central star's high-luminosity wind.
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