利用野边山射电天文台45米望远镜观测了HN 13 C J=1-0和DNC J=1-0谱线，它们指向18个大质量团簇，包括红外暗云（IRDC）和大质量原恒星天体（HMPO）。我们已经发现，HN 13 C的发射是强于DNC发射对所有观察到的源。在观测到的高质量源的平均DNC/HNC比值（0.009 \pm 0.005）确实低于低质量无星和恒星形成核心的平均DNC/HNC比值（0.06）。由NH3（J，K）=（1，1）和（2，2）谱线强度得到的动力学温度，在高质量源处比在低质量核处高。然而，一些IRDCs的DNC/HNC比被发现低于HMPO的DNC/HNC比，尽管IRDCs的动力学温度低于HMPO。这意味着DNC/HNC比率不仅取决于当前的动力学温度。借助于化学模型模拟，我们讨论了原恒星诞生后DNC/HNC比值如何降低。我们认为，DNC/HNC比在恒星形成的核心取决于物理条件和历史，在他们的无星核心阶段，如其持续时间和气体动力学温度。
英文摘要：
We have observed the HN13C J=1-0 and DNC J=1-0 lines toward 18 massive clumps, including infrared dark clouds (IRDCs) and high-mass protostellar objects (HMPOs), by using the Nobeyama Radio Observatory 45 m telescope. We have found that the HN13C emission is stronger than the DNC emission toward all the observed sources. The averaged DNC/HNC ratio is indeed lower toward the observed high-mass sources (0.009\pm0.005) than toward the low-mass starless and star-forming cores (0.06). The kinetic temperature derived from the NH3 (J, K) = (1, 1) and (2, 2) line intensities is higher toward the observed high-mass sources than toward the low-mass cores. However the DNC/HNC ratio of some IRDCs involving the Spitzer 24 μm sources is found to be lower than that of HMPOs, although the kinetic temperature of the IRDCs is lower than that of the HMPOs. This implies that the DNC/HNC ratio does not depend only on the current kinetic temperature. With the aid of chemical model simulations, we discuss how the DNC/HNC ratio decreases after the birth of protostars. We suggest that the DNC/HNC ratio in star-forming cores depends on the physical conditions and history in their starless-core phase, such as its duration time and the gas kinetic temperature.
ALMA Observations of the IRDC Clump G34.43+00.24 MM3: Complex Organic and Deuterated Molecules
利用阿塔卡马大型毫米波/亚毫米波阵列（ALMA）观测了与红外暗云（IRDC）团簇G34.43+00.24 MM 3有关的热核/科里诺（HC）的复杂有机分子（COMs）和氘代物质。我们已经检测到六个正常COM（CH 3OH，CH 3CHO，CH 3CH 2CN，CH 3 OCH 3，HCOOCH 3和NH 2CHO），一个氘代COM（CH 2DCN），和两个氘代基本分子（D2CO和DNC）对G34.43+00.24 MM 3 HC。在我们的数据中，除了CH 3OH之外，没有检测到这些线朝向冲击区域，这表明COMs不起源于冲击。发现G34.43+00.24 MM 3 HC中COMs相对于CH 3OH的丰度与高质量热核中的丰度相似，而不是低质量恒星形成区中的热Corino中的丰度。这一结果表明，G34.43+00.24 MM 3 HC预热阶段的物理条件与高质量源相似。另一方面，G34.43+00.24 MM 3 HC中相对于CH $_3$ OH的D2CO丰度高于其他热核，并且似乎与热Corino相当。G34.43+00.24 MM 3 HC的相对高的D2CO/CH 3OH比意味着G34.43+00.24 MM 3 HC的长的冷无星相。
ALOHA IRDCs Molecular Line Follow-up: I. Gas properties and kinematics
State Key Laboratory of Radio Astronomy and Technology, Xinjiang Astronomical Observatory, Chinese Academy of Sciences（中国科学院新疆天文台射电天文与技术国家重点实验室）；National Astronomical Observatories, Chinese Academy of Sciences（中国科学院国家天文台）；Max-Planck-Institut für Radioastronomie（马普射电天文研究所）；Division of Science, National Astronomical Observatory of Japan（日本国立天文台理学院）；Xinjiang Key Laboratory of Radio Astrophysics（新疆射电天体物理重点实验室）；University of the Chinese Academy of Sciences（中国科学院大学）；New Cornerstone Science Laboratory, Department of Astronomy, Tsinghua University（清华大学天文系新基石科学实验室）；Space Engineering University（航天工程大学）；Jodrell Bank Centre for Astrophysics, Department of Physics & Astronomy, The University of Manchester（曼彻斯特大学物理与天文学系乔德雷尔银行天体物理学中心）
