Molecular Cloud Cores with a High Deuterium Fraction: Nobeyama Single-pointing Survey
Kim,Gwanjeong1; Tatematsu,Ken’ichi1,2; Liu,Tie3; Yi,Hee-Weon4; He,Jinhua5,6,7; Hirano,Naomi8; Liu,Sheng-Yuan8; Choi,Minho9; Sanhueza,Patricio2,10; Tóth,L. Viktor11; Evans II,Neal J.12; Feng,Siyi10,13,14; Juvela,Mika15; Kim,Kee-Tae9,16; Vastel,Charlotte17; Lee,Jeong-Eun4; Nguy?n Lu’o’ng,Quang9,10,18; Kang,Miju9; Ristorcelli,Isabelle19; Fehér,Orsolya20; Wu,Yuefang21; Ohashi,Satoshi22; Wang,Ke23; Kandori,Ryo10; Hirota,Tomoya2,10; Sakai,Takeshi24; Lu,Xing10; Thompson,Mark A.25; Fuller,Gary A.26; Li,Di27; Shinnaga,Hiroko28; Kim,Jungha2,10
Source PublicationThe Astrophysical Journal Supplement Series
AbstractAbstract 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.
KeywordClouds Interstellar molecules Astrochemistry Star formation
WOS IDIOP:0067-0049-249-2-aba746
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Nobeyama Radio Observatory, National Astronomical Observatory of Japan, National Institutes of Natural Sciences, Nobeyama, Minamimaki, Minamisaku, Nagano 384-1305, Japan;
2.Department of Astronomical Science, SOKENDAI (The Graduate University for Advanced Studies), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
3.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People’s Republic of China
4.School of Space Research, Kyung Hee University, Seocheon-Dong, Giheung-Gu, Yongin-Si, Gyeonggi-Do, 446-701, Republic of Korea
5.Yunnan Observatories, Chinese Academy of Sciences, 396 Yangfangwang, Guandu District, Kunming, 650216, People’s Republic of China
6.Chinese Academy of Sciences South America Center for Astronomy, National Astronomical Observatories, CAS, Beijing 100101, People’s Republic of China
7.Departamento de Astronomía, Universidad de Chile, Casilla 36-D, Santiago, Chile
8.Academia Sinica Institute of Astronomy and Astrophysics, 11F of Astronomy-Mathematics Building, AS/NTU. No.1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, R.O.C.
9.Korea Astronomy and Space Science Institute, Daedeokdaero 776, Yuseong, Daejeon 305-348, Republic of Korea
10.National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
11.Department of Astronomy, E?tv?s Loránd University, Pázmány Péter sétny 1, 1117 Budapest, Hungary
12.Department of Astronomy, The University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712-1205, USA
13.Chinese Academy of Sciences Key Laboratory of FAST, National Astronomical Observatory of China, Datun Road 20, Chaoyang, Beijing, 100012, People’s Republic of China
14.Academia Sinica Institute of Astronomy and Astrophysics, No.1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, Republic of China
15.Department of Physics, P.O. Box 64, FI-00014, University of Helsinki, Finland
16.University of Science and Technology, Korea (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
17.IRAP, Université de Toulouse, CNRS, CNES, UPS, (Toulouse), France
18.IBM, Canada
19.RAP, CNRS (UMR5277), Université Paul Sabatier, 9 avenue du Colonel Roche, BP 44346, F-31028, Toulouse Cedex 4, France
20.Institut de Radioastronomie Millimetrique, 300 Rue de la Piscine, F-38406, Saint Martin d’Heres, France
21.Department of Astronomy, Peking University, 100871, Beijing, People’s Republic of China
22.The Institute of Physical and Chemical Research (RIKEN), 2-1, Hirosawa, Wako-shi, Saitama 351-0198, Japan
23.Kavli Institute for Astronomy and Astrophysics, Peking University, 5 Yiheyuan Road, Haidian District, Beijing 100871, People’s Republic of China
24.Graduate School of Informatics and Engineering, The University of Electro-Communications, Chofu, Tokyo 182-8585, Japan
25.Centre for Astrophysics Research, Science & Technology Research Institute, University of Hertfordshire, Hatfield, AL10 9AB, UK
26.Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
27.National Astronomical Observatories, Chinese Academy of Sciences, Beijing, 100012, People’s Republic of China
28.Department of Physics, Kagoshima University, 1-21-35, Korimoto, Kagoshima, 890-0065, Japan
Recommended Citation
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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