论文标题
酰胺分子的家族朝向NGC 6334i
The family of amide molecules toward NGC 6334I
论文作者
论文摘要
在太空中产生的酰胺分子可以在年轻行星物体上生物分子的形成中起关键作用。但是，空间中酰胺分子的形成和化学网络尚不清楚。在这项工作中，ALMA观察结果用于研究许多酰胺（类似）分子，朝向高质量星形成NGC 6334i。氰酰胺（NH $ _ {2} $ CN），乙酰酰胺（Ch $ _ {3} $ c（o）NH $ _ {2} $）和N-甲基甲酰胺（Ch $ _ {3} $ NHCHO）的首次检测。这些结合了异氰酸（HNCO）和甲酰胺（NH $ _ {2} $ CHO）的分析，以及对尿素（Carbamide; NH $ _ {2} $ C（O）NH $ _ $ _ {2} $）的初步检测。丰富的相关性表明，大多数酰胺可能是在NGC 6334i中星际尘埃粒的IC中发生的相关反应中形成的。但是，在扩展的来源样本中，对于NH $ _ {2} $ cn而言，人们可以看到大量的差异，这似乎取决于源类型，这表明源内的物理条件在很大程度上影响了该物种的产生。 NGC 6334i的丰富酰胺清单增强了星际分子可以促进生物分子在行星上的出现的情况。
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.
