Chemical Properties of Two Dense Cores in a Planck Galactic Cold Clump G168.72-15.48 | |
Tang,Mengyao12; Ge,J. X.11; Qin,Sheng-Li12; Liu,Tie10; Wu,Yuefang9; Kim,Kee-Tae7,8; Liu,Sheng-Yuan4; Zhang,Chao9,12; He JH(何金华)2,3,6; Ju,Bing-Gang5 | |
刊名 | ASTROPHYSICAL JOURNAL |
2019-12-20 | |
卷号 | 887期号:2页码:15 |
ISSN号 | 0004-637X |
DOI | 10.3847/1538-4357/ab5447 |
产权排序 | 第8完成单位 |
文献子类 | Article |
英文摘要 | To deepen our understanding of the chemical properties of the Planck Galactic Cold Clump (PGCC) G168.72-15.48, we performed observations of nine molecular species, namely, c-C3H, H2CO, HC5N, HC7N, SO, CCH, N2H+, CH3OH, and CH3CCH, toward two dense cores in PGCC G168.72-15.48 using the Tianma Radio Telescope and Purple Mountain Observatory Telescope. We detected c-C3H, H2CO, HC5N, N2H+, CCH, and CH3OH in both G168-H1 and G168-H2 cores, whereas HC7N and CH3CCH were detected only in G168-H1 and SO was detected only in G168-H2. Mapping observations reveal that the CCH, N2H+, CH3OH, and CH3CCH emissions are well coupled with the dust emission in G168-H1. Additionally, N2H+ exhibits an exceptionally weak emission in the denser and more evolved G168-H2 core, which may be attributed to the N2H+ depletion. We suggest that the N2H+ depletion in G168-H2 is dominated by N-2 depletion, rather than the destruction by CO. The local thermodynamic equilibrium calculations indicate that the carbon-chain molecules of CCH, HC5N, HC7N, and CH3CCH are more abundant in the younger G168-H1 core. We found that starless core G168-H1 may have the properties of cold dark clouds based on its abundances of carbon-chain molecules. While, the prestellar core G168H2 exhibits lower carbon-chain molecular abundances than the general cold dark clouds. With our gas-grain astrochemical model calculations, we attribute the observed chemical differences between G168-H1 and G168-H2 to their different gas densities and different evolutionary stages. |
学科主题 | 天文学 ; 恒星与银河系 |
URL标识 | 查看原文 |
出版地 | TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND |
资助项目 | National Key R&D Program of China[2017YFA0402701] ; National Natural Science Foundation of China[11373026] ; National Natural Science Foundation of China[11433004] ; National Natural Science Foundation of China[U1631237] ; Chinese Academy of Sciences[U1631237] ; Top Talents Program of Yunnan Province[2015HA030] ; FONDECYT[3170768] ; "Light of West China" program of Chinese Academy of Sciences (CAS) ; China Scholarship Council (CSC) ; Yunnan University |
WOS关键词 | DARK CLOUDS ; STARLESS CORES ; COLUMN DENSITY ; CHEMISTRY ; N2H+ ; GAS ; CYANOPOLYYNES ; EXTINCTION ; MOLECULES ; INFALL |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | IOP PUBLISHING LTD |
WOS记录号 | WOS:000506012000137 |
资助机构 | National Key R&D Program of China[2017YFA0402701] ; National Natural Science Foundation of China[11373026, 11433004, U1631237] ; Chinese Academy of Sciences[U1631237] ; Top Talents Program of Yunnan Province[2015HA030] ; FONDECYT[3170768] ; "Light of West China" program of Chinese Academy of Sciences (CAS) ; China Scholarship Council (CSC) ; Yunnan University |
内容类型 | 期刊论文 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/21597] |
专题 | 云南天文台_大样本恒星演化研究组 |
通讯作者 | Tang,Mengyao |
作者单位 | 1.Department of Electronic Engineering, Zhengzhou Railway Vocational & Technical College, Zhengzhou, 451460, People's Republic of China 2.Chinese Academy of Sciences, South America Center for Astrophysics (CASSACA), Camino El Observatorio 1515, Las Condes, Santiago, Chile 3.Departamento de Astronomía, Universidad de Chile, Las Condes, Santiago, Chile 4.Institute of Astronomy and Astrophysics, Academia Sinica. 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan 5.Purple Mountain Observatory, Qinghai Station, 817000, Delingha, People's Republic of China 6.Key Laboratory for the Structure and Evolution of Celestial Objects, Yunnan Observatories, Chinese Academy of Sciences, P.O. Box 110, Kunming, 650011, Yunnan Province, People's Republic of China 7.University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic Of Korea 8.Korea Astronomy and Space Science Institute, 776 Daedeokdaero, Yuseong-gu, Daejeon 34055, Republic Of Korea 9.Department of Astronomy, Peking University, 100871, Beijing, People's Republic of China 10.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China |
推荐引用方式 GB/T 7714 | Tang,Mengyao,Ge,J. X.,Qin,Sheng-Li,et al. Chemical Properties of Two Dense Cores in a Planck Galactic Cold Clump G168.72-15.48[J]. ASTROPHYSICAL JOURNAL,2019,887(2):15. |
APA | Tang,Mengyao.,Ge,J. X..,Qin,Sheng-Li.,Liu,Tie.,Wu,Yuefang.,...&Fang,Xinhe.(2019).Chemical Properties of Two Dense Cores in a Planck Galactic Cold Clump G168.72-15.48.ASTROPHYSICAL JOURNAL,887(2),15. |
MLA | Tang,Mengyao,et al."Chemical Properties of Two Dense Cores in a Planck Galactic Cold Clump G168.72-15.48".ASTROPHYSICAL JOURNAL 887.2(2019):15. |
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