对21微米原行星状星云IRAS 06530-0213的干涉分子线观测
Interferometric molecular line observations toward the 21 μm protoplanetary nebula IRAS 06530-0213
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中文总结 AI 辅助
研究21微米原行星状星云IRAS 06530-0213，通过北方扩展毫米波阵列高分辨率干涉观测，检测并分辨多种分子跃迁，分析谱线发现HC₃N等主要集中在内侧低纬度赤道区，揭示内侧赤道区域利于碳链化学。
中文摘要 AI 辅助
一些原行星状星云21微米特征的识别仍是长期谜题，需表征相关源的分子气体环境。本文展示了北方扩展毫米波阵列对21微米原行星状星云IRAS 06530-0213的高分辨率干涉观测。检测到并空间分辨了HC₃N、C₄H和SiC₂的多个分子跃迁。分析这些谱线及此前报道的该源的CO和¹³CO发射。与CO和¹³CO追踪的扩展桶状分子结构不同，HC₃N和C₄H主要集中在内侧低纬度赤道区。再现观测形态需HC₃N比CO和¹³CO有更向内集中的丰度分布，这意味着内侧赤道区域为碳链化学提供了有利条件。
英文摘要
The identification of the $21\,μ\mathrm{m}$ feature in some protoplanetary nebulae remains a longstanding puzzle, whose interpretation requires characterization of the molecular gas environments of associated sources. Here, we present high-resolution interferometric observations from the Northern Extended Millimeter Array toward the $21\,μ\mathrm{m}$ protoplanetary nebula IRAS 06530-0213. Multiple molecular transitions of $\mathrm{HC_3N}$, $\mathrm{C_4H}$, and $\mathrm{SiC_2}$ are detected and spatially resolved. We analyze these spectral lines alongside previously reported CO and $^{13}\mathrm{CO}$ emission toward this source. Differing from the extended barrel-like molecular structure traced by CO and $^{13}\mathrm{CO}$, $\mathrm{HC_3N}$ and $\mathrm{C_4H}$ are predominantly concentrated in the inner low-latitude equatorial zones. Reproducing the observed morphology requires $\mathrm{HC_3N}$ to possess a more inwardly concentrated abundance distribution compared with CO and $^{13}\mathrm{CO}$, implying that the inner equatorial regions provide favorable conditions for carbon-chain chemistry.
