朝向NGC 6334 I的酰胺分子家族
The family of amide molecules toward NGC 6334I
摘要：
太空中产生的酰胺分子可能在年轻行星物体上形成生物分子的过程中发挥关键作用。然而，酰胺分子在空间中的形成和化学网络还没有得到很好的理解。在这项工作中，ALMA观测被用来研究一些酰胺（类）分子朝向高质量的恒星形成区NGC 6334 I。首次检出该来源的氰胺（NH $_{2}$ CN）、乙酰胺（CH $_{3}$ C（O）NH $_{2}$）和N-甲基甲酰胺（CH $_{3}$ NHCHO）。这些与异氰酸（HNCO）和甲酰胺（NH $_{2}$ CHO）的分析以及尿素（尿素; NH $_{2}$ C（O）NH $_{2}$）的试验性检测相结合。绝对相关性表明，大多数酰胺可能是在NGC 6334 I星际尘埃颗粒上的冰中发生的相关反应中形成的。然而，在扩大的来源样本中，NH $_{2}$ CN的丰度变化很大，似乎取决于来源类型，这表明来源内的物理条件严重影响了该物种的产生。NGC 6334 I丰富的酰胺库存加强了星际分子可以促进行星上生物分子出现的情况。
英文摘要：
Amide molecules produced in space could play a key role in the formation of biomolecules on a young planetary object. However, the formation and chemical network of amide molecules in space is not well understood. In this work, ALMA observations are used to study a number of amide(-like) molecules toward the high-mass star-forming region NGC 6334I. The first detections of cyanamide (NH$_{2}$CN), acetamide (CH$_{3}$C(O)NH$_{2}$) and N-methylformamide (CH$_{3}$NHCHO) are presented for this source. These are combined with analyses of isocyanic acid (HNCO) and formamide (NH$_{2}$CHO) and a tentative detection of urea (carbamide; NH$_{2}$C(O)NH$_{2}$). Abundance correlations show that most amides are likely formed in related reactions occurring in ices on interstellar dust grains in NGC 6334I. However, in an expanded sample of sources, large abundance variations are seen for NH$_{2}$CN that seem to depend on the source type, which suggests that the physical conditions within the source heavily influence the production of this species. The rich amide inventory of NGC 6334I strengthens the case that interstellar molecules can contribute to the emergence of biomolecules on planets.
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