Chemical Properties of Two Dense Cores in a Planck Galactic Cold Clump G168.72-15.48
文献类型：期刊论文
| 作者 | Tang, Mengyao12,13; Ge, J. X.11; Qin, Sheng-Li12,13; Liu, Tie10; Wu, Yuefang9; Kim, Kee-Tae7,8; Liu, Sheng-Yuan6; Zhang, Chao9,12,13; He, J. H.3,4,5; Ju, Bing-Gang2 |
| 刊名 | ASTROPHYSICAL JOURNAL
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| 出版日期 | 2019-12-20 |
| 卷号 | 887期号:2页码:15 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab5447 |
| 通讯作者 | Tang, Mengyao(mengyao_tang@yeah.net) |
| 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. |
| 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 |
| WOS记录号 | WOS:000506012000137 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/35617]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Tang, Mengyao |
| 作者单位 | 1.Zhengzhou Railway Vocat & Tech Coll, Dept Elect Engn, Zhengzhou 451460, Peoples R China 2.Purple Mt Observ, Qinghai Stn, Delingha 817000, Peoples R China 3.Univ Chile, Dept Astron, Santiago, Chile 4.Chinese Acad Sci, South Amer Ctr Astrophys CASSACA, Camino Observ 1515, Santiago, Chile 5.Chinese Acad Sci, Yunnan Observ, Key Lab Struct & Evolut Celestial Objects, POB 110, Kunming 650011, Yunnan, Peoples R China 6.Acad Sinica, Inst Astron & Astrophys, 11F Astron Math Bldg,AS NTU 1,Sect 4,Roosevelt Rd, Taipei 10617, Taiwan 7.Univ Sci & Technol, 217 Gajeong Ro, Daejeon 34113, South Korea 8.Korea Astron & Space Sci Inst, 776 Daedeokdaero, Daejeon 34055, South Korea 9.Peking Univ, Dept Astron, Beijing 100871, Peoples R China 10.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R 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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