Molecular Cloud Cores with a High Deuterium Fraction: Nobeyama Single-pointing Survey
文献类型：期刊论文
| 作者 | Kim,Gwanjeong21; Tatematsu,Ken’ichi21,22; Liu,Tie23; Yi,Hee-Weon24; He,Jinhua25,26,27; Hirano,Naomi20; Liu,Sheng-Yuan20; Choi,Minho19; Sanhueza,Patricio22,28; Tóth,L. Viktor1 |
| 刊名 | The Astrophysical Journal Supplement Series
 |
| 出版日期 | 2020-08-01 |
| 卷号 | 249期号:2 |
| 关键词 | Clouds Interstellar molecules Astrochemistry Star formation |
| ISSN号 | 0067-0049 |
| DOI | 10.3847/1538-4365/aba746 |
| 英文摘要 | Abstract We present the results of a single-pointing survey of 207 dense cores embedded in Planck Galactic Cold Clumps distributed in five different environments (λ Orionis, Orion A, Orion B, the Galactic plane, and high latitudes) to identify dense cores on the verge of star formation for the study of the initial conditions of star formation. We observed these cores in eight molecular lines at 76–94 GHz using the Nobeyama 45 m telescope. We find that early-type molecules (e.g., CCS) have low detection rates and that late-type molecules (e.g., N2H+ and c-C3H2) and deuterated molecules (e.g., N2D+ and DNC) have high detection rates, suggesting that most of the cores are chemically evolved. The deuterium fraction (D/H) is found to decrease with increasing distance, indicating that it suffers from differential beam dilution between the D/H pair of lines for distant cores (>1 kpc). For λ Orionis, Orion A, and Orion B located at similar distances, D/H is not significantly different, suggesting that there is no systematic difference in the observed chemical properties among these three regions. We identify at least eight high-D/H cores in the Orion region and two at high latitudes, which are most likely to be close to the onset of star formation. There is no clear evidence of the evolutionary change in turbulence during the starless phase, suggesting that the dissipation of turbulence is not a major mechanism for the beginning of star formation as judged from observations with a beam size of 0.04 pc. |
| 语种 | 英语 |
| WOS记录号 | IOP:0067-0049-249-2-ABA746 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/62586]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Department of Astronomy, E?tv?s Loránd University, Pázmány Péter sétny 1, 1117 Budapest, Hungary 2.Department of Astronomy, The University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712-1205, USA 3.Chinese Academy of Sciences Key Laboratory of FAST, National Astronomical Observatory of China, Datun Road 20, Chaoyang, Beijing, 100012, People’s Republic of China 4.Academia Sinica Institute of Astronomy and Astrophysics, No.1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, Republic of China 5.Department of Physics, P.O. Box 64, FI-00014, University of Helsinki, Finland 6.University of Science and Technology, Korea (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea 7.IRAP, Université de Toulouse, CNRS, CNES, UPS, (Toulouse), France 8.IBM, Canada 9.RAP, CNRS (UMR5277), Université Paul Sabatier, 9 avenue du Colonel Roche, BP 44346, F-31028, Toulouse Cedex 4, France 10.Institut de Radioastronomie Millimetrique, 300 Rue de la Piscine, F-38406, Saint Martin d’Heres, France |
| 推荐引用方式 GB/T 7714 | Kim,Gwanjeong,Tatematsu,Ken’ichi,Liu,Tie,et al. Molecular Cloud Cores with a High Deuterium Fraction: Nobeyama Single-pointing Survey[J]. The Astrophysical Journal Supplement Series,2020,249(2). |
| APA | Kim,Gwanjeong.,Tatematsu,Ken’ichi.,Liu,Tie.,Yi,Hee-Weon.,He,Jinhua.,...&Kim,Jungha.(2020).Molecular Cloud Cores with a High Deuterium Fraction: Nobeyama Single-pointing Survey.The Astrophysical Journal Supplement Series,249(2). |
| MLA | Kim,Gwanjeong,et al."Molecular Cloud Cores with a High Deuterium Fraction: Nobeyama Single-pointing Survey".The Astrophysical Journal Supplement Series 249.2(2020). |
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来源：国家天文台
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