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arXiv 2106.04052astro-ph.GA
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高氘分子云核:野边山测绘巡天

Molecular Cloud Cores with High Deuterium Fractions: Nobeyama Mapping Survey

Ken'ichi Tatematsu, Gwanjeong Kim, Tie Liu, Neal J. Evans, Hee-Weon Yi, Jeong-Eun Lee, Yuefang Wu, Naomi Hirano, Sheng-Yuan Liu, Somnath Dutta, Dipen Sahu, Patr… 展开作者

Ken'ichi Tatematsu, Gwanjeong Kim, Tie Liu, Neal J. Evans, Hee-Weon Yi, Jeong-Eun Lee, Yuefang Wu, Naomi Hirano, Sheng-Yuan Liu, Somnath Dutta, Dipen Sahu, Patricio Sanhueza, Kee-Tae Kim, Mika Juvela, L. Viktor T'oth, Orsolya Feh'er, Jinhua He, J. X. Ge, Siyi Feng, Minho Choi, Miju Kang, Mark A. Thompson, Gary A. Fuller, Di Li, Isabelle Ristorcelli, Ke Wang, James Di Francesco, David Eden, Satoshi Ohashi, Ryo Kandori, Charlotte Vastel, Tomoya Hirota, Takeshi Sakai, Xing Lu, Quang Nguyen Lu'o'ng, Hiroko Shinnaga, Jungha Kim, JCMT Large Program "SCOPE'' collaboration

摘要:

我们提出的44个领域,包含107个SCUBA-2核心的发射线的分子,N $_2$ H $^+$,HC $_3$ N,和CCS在82 $-$ 94 GHz的使用Nobeyama 45米望远镜的飞行测绘观测结果。这项研究的目的是调查核心的物理性质,显示高氘分数,并可能接近恒星形成的开始。我们发现,N $_2$ H $^+$和HC $_3$ N谱线发射的分布与850- $μ$ m尘埃连续谱线发射的分布近似,而CCS谱线发射往往未被探测到,或分布在850- $μ$ m尘埃连续谱线发射峰位周围的团簇结构中。偶尔(12%),我们观察到CCS排放,这是一个早期型气体示踪剂对年轻的恒星对象,可能是由于当地的高激发。朝向恒星形成的演化不会立即影响非热速度色散。

英文摘要:

We present the results of on-the-fly mapping observations of 44 fields containing 107 SCUBA-2 cores in the emission lines of molecules, N$_2$H$^+$, HC$_3$N, and CCS at 82$-$94 GHz using the Nobeyama 45-m telescope. This study aimed at investigating the physical properties of cores that show high deuterium fractions and might be close to the onset of star formation. We found that the distributions of the N$_2$H$^+$ and HC$_3$N line emissions are approximately similar to that of 850-$μ$m dust continuum emission, whereas the CCS line emission is often undetected or is distributed in a clumpy structure surrounding the peak position of the 850-$μ$m dust continuum emission. Occasionally (12%), we observe the CCS emission which is an early-type gas tracer toward the young stellar object, probably due to local high excitation. Evolution toward star formation does not immediately affect nonthermal velocity dispersion.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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