天鹅座全尺度化学与动力学环境巡天：CASCADE III. DCO+、DNC和DCN在DR21纤维状结构中的大尺度分布
The Cygnus Allscale Survey of Chemistry and Dynamical Environments: CASCADE III. The large scale distribution of DCO+, DNC and DCN in the DR21 filament
AI总结：
本文基于CASCADE项目，研究天鹅座-X区域DR21纤维状结构中DCO+、DNC和DCN的大尺度分布，发现三者形态差异显著，氘代比值与尘埃温度及N(H2)呈反相关，且DCN与DNC同位素体比值可作为动力学气体温度示踪剂。
摘要：
氘代分子及其分子D/H比值（RD(D)）是研究恒星形成区物理条件的重要诊断工具。氘代程度RD(D)可随物理参数的不同，显著高于元素D/H比值。在天鹅座全尺度化学与动力学环境巡天（CASCADE）项目中，我们旨在探究附近天鹅座-X区域氘代分子的大尺度分布。我们重点分析托管显著Hii区DR21和DR21(OH)的纤维状区域内氘代分子的大尺度结构。本文讨论HCO+、HNC和HCN分子及其氘代同位素体DCO+、DNC和DCN。DCO+、DNC和DCN的积分谱线发射空间分布揭示了形态差异。DCO+呈现最延展的发射，具有数个显著峰值。同样，DNC也表现出多个峰值，尽管其发射与DCO+相比显得较不延展。与DCO+和DNC的延展发射相反，DCN延展程度最小，具有明显的峰值。仅聚焦于三种分子均被观测到的区域，各物种的平均氘代比值分别为DNC和DCN的0.01，以及DCO+的0.005。发现氘代分子与尘埃温度或N(H2)之间存在反相关性。最强的反相关性出现在RD(DCO+)与N(H2)之间。RD(DCO+)与N(H2)的反相关性被认为是光解离程度增加和激波共同作用的结果。在高柱密度区域，发现DCN和DNC与其13C同位素体的积分强度比值之间存在强正相关性。同分异构体D同位素体比值间的正相关表明，其有可能作为动力学气体温度的示踪剂。
英文摘要：
Deuterated molecules and their molecular D/H-ratios (RD(D)) are important diagnostic tools to study the physical conditions of star-forming regions. The degree of deuteration, RD(D), can be significantly enhanced over the elemental D/H-ratio depending on physical parameters. Within the Cygnus Allscale Survey of Chemistry and Dynamical Environments (CASCADE), we aim to explore the large-scale distribution of deuterated molecules in the nearby Cygnus-X region. We focus on the analysis of large-scale structures of deuterated molecules in the filamentary region hosting the prominent Hii region DR21 and DR21(OH). Here we discuss the HCO+, HNC and HCN molecules and their deuterated isotopologues DCO+, DNC and DCN. The spatial distributions of integrated line emissions from DCO+, DNC, and DCN reveal morphological differences. DCO+ displays the most extended emission, characterized by several prominent peaks. Likewise, DNC exhibits multiple peaks, although its emission appears less extended compared to DCO+. In contrast to the extended emission of DCO+ and DNC, DCN appears the least extended, with distinct peaks. Focusing only on the regions where all three molecules are observed, the mean deuteration ratios for each species are 0.01 for both DNC and DCN, and = 0.005 for DCO+. Anti-correlations are found with deuterated molecules and dust temperature or N(H2). The strongest anti-correlation is found with RD(DCO+) and N(H2). The anti-correlation of RD(DCO+) and N(H2) is suggested to be a result of a combination of an increased photodissociation degree and shocks. A strong positive correlation between the ratio of integrated intensities of DCN and DNC with their 13C-isotopologues, are found in high column density regions. The positive relationship between the ratios implies that the D-isotopologue of the isomers could potentially serve as a tracer for the kinetic gas temperature.
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