大麦哲伦星系30 Doradus恒星形成区中脂肪族氘代芳香烃的探测
Detection of Aliphatically Deuterated Aromatic Hydrocarbons in the Large Magellanic Cloud 30 Doradus Star-Forming Complex
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中文总结 AI 辅助
本研究利用JWST的NIRSpec与MIRI观测，在大麦哲伦星系30 Doradus恒星形成区探测到含可观脂肪族成分的氘代芳香烃，还发现6.85微米发射特征存在三个新的复杂子结构。
中文摘要 AI 辅助
3.3、6.2、7.7、8.6、11.3和12.7微米的未确认红外（IR）发射（UIE）带广泛存在于各类天体物理环境中。尽管这些UIE带的确切归属仍存在争议，但通常被归因于芳香烃分子的C--H和C--C伸缩及弯曲振动。本文基于詹姆斯·韦布空间望远镜（JWST）搭载的近红外光谱仪（NIRSpec）和中红外仪器（MIRI）的观测数据，报告大麦哲伦星系（LMC）30 Doradus恒星形成区的UIE发射体为氘代且含有可观的脂肪族成分。30 Doradus的空间分辨NIRSpec和MIRI光谱显示，广泛探测到分别归因于脂肪族C--H伸缩和变形的3.4微米、6.85微米发射特征，以及归因于脂肪族C--D伸缩的4.65微米特征。值得注意的是，6.85微米特征呈现出此前从未报道过的~6.83、6.86和6.88微米三个复杂子结构。
英文摘要
The unidentified infrared (IR) emission (UIE) bands at 3.3, 6.2, 7.7, 8.6, 11.3 and 12.7 micron are ubiquitously seen in a wide variety of astrophysical environments. While the exact assignment of these UIE bands remains controversial, they are generally ascribed to C--H and C--C stretching and bending vibrations of aromatic hydrocarbon molecules. Here, based on observations made with the Near Infrared Spectrograph (NIRSpec) and the Mid Infrared Instrument (MIRI) aboard the James Webb Space Telescope (JWST), we report that the UIE emitters in the 30 Doradus star-forming complex in the Large Magellanic Cloud (LMC) are deuterated and have an appreciable amount of aliphatic content. The spatially resolved NIRSpec and MIRI spectra of 30 Doradus reveal a widespread detection of the 3.4 and 6.85 micron emission features attributed to aliphatic C--H stretch and deformation, respectively, as well as the 4.65 micron feature attributed to aliphatic C--D stretch. Notably, the 6.85 micron feature exhibits three complex substructures at ~6.83, 6.86 and 6.88 micron that have never been reported before.
