发表机构
Center for Astrophysics — Harvard & Smithsonian; Department of Physics, University of Warwick; Institute of Science and Technology Austria（哈佛-史密森尼天体物理中心; 华威大学物理系; 奥地利科学与技术研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
通过双子座北望远镜窄带成像，发现超新星Iax遗迹Pa 30的喷出物纤维由级联结节构成，并测得中心恒星无大横向冲力，为纤维起源演化模型提供新约束。
AI 中文摘要
我们展示了帕洛马30星云的深场、窄带双子座北望远镜/GMOS图像，这些图像揭示了喷出物纤维中的丰富小尺度结构。在[S II]波段，探测到的纤维数量相比之前的研究增加了大约一个数量级。成像进一步揭示，这些纤维并非平滑的径向条纹，而是由一系列结节或团块级联组成。[O III]波段的图像首次证实了先前探测到的弥漫[O III]发射实际上源自相同的[S II]纤维。我们测量到的星云中心与中心恒星的位置一致，表明该遗迹未受到大的横向冲力。恒星冲力的3σ速度上限为≲100 km/s。纤维在[S II]和[O III]波段的横截面轮廓显示，在星云背景之上有一个中心峰值，后者可能源于弥漫发射或未分辨的纤维。[S II]宽度中值为0.7角秒，略宽于0.50角秒的视宁度，这提供了部分纤维被分辨的证据，并暗示特征结节直径约为10^16厘米。在[O III]波段测得的约1角秒宽度与氧图像较差的视宁度一致。这种团块状子结构的发现为帕洛马30显著纤维状喷出物的起源与演化模型提供了新的观测约束。
英文摘要
We present deep, narrowband Gemini North/GMOS images of the Pa 30 nebula that reveal rich small-scale structure in the ejecta filaments. In [S II], the number of detected filaments increases by about an order of magnitude compared to previous studies. The imaging further reveals that the filaments are not smooth radial streaks, but instead are composed of cascades of knots or clumps. The images in [O III] yield the first confirmation that previously detected diffuse [O III] emission in fact originates from the same [S II] filaments. We measure a nebula center consistent with the position of the central star, indicating that the remnant has not received a large transverse kick. The 3$σ$ upper limit on the velocity of the stellar kick is $\lesssim$100 km/s. Cross-sectional profiles of the filaments in [S II] and [O III] show a central peak on top of a nebular background, the latter being likely due to diffuse emission or unresolved filaments. The median [S II] width of 0.7'' is slightly broader than the 0.50'' seeing, providing some evidence of partially resolved filaments and implying a characteristic knot diameter of ${\sim}10^{16}$ cm. The $\approx$1'' widths measured in [O III] are consistent with the poorer seeing of the oxygen images. The discovery of this clumpy substructure provides a new observational constraint on models for the origin and evolution of the remarkable filamentary ejecta of Pa 30.
Comments15 pages, 10 figures. In press at ApJ
