OH Evolution in Molecular Clouds
文献类型：期刊论文
| 作者 | Tang,Ningyu8; Li,Di1,8,9 ; Yue,Nannan1,8; Zuo,Pei1,6,7; Liu,Tie4,5; Luo,Gan1,8; Chen,Longfei8; Qin,Sheng-Li3; Wu,Yuefang2,7; Heiles,Carl10
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| 刊名 | The Astrophysical Journal Supplement Series
 |
| 出版日期 | 2020-12-17 |
| 卷号 | 252期号:1 |
| 关键词 | Hydroxyl sources Molecular gas Diffuse molecular clouds |
| ISSN号 | 0067-0049 |
| DOI | 10.3847/1538-4365/abca94 |
| 英文摘要 | Abstract We have conducted a OH 18 cm survey toward 141 molecular clouds in various environments, including 33 optical dark clouds, 98 Planck Galactic cold clumps (PGCCs), and 10 Spitzer dark clouds with the Arecibo telescope. The deviations from local thermal equilibrium are common for intensity ratios of both OH main lines and satellite lines. Line intensity of OH 1667 MHz is found to correlate linearly with visual extinction when is less than 3 mag. It was converted into OH column density by adopting the excitation temperature derived from Monte Carlo simulations with 1σ uncertainty. The relationship between OH abundance X(OH) relative to H2 and is found to follow an empirical formula, Linear correlation is found between OH and 13CO?intensity. Besides, nonthermal velocity dispersions of OH and 13CO?are closely correlated. These results imply tight chemical evolution and spatial occupation between OH and 13CO. No obvious correlation is found between column density and nonthermal velocity dispersion of OH and H i narrow self-absorption (HINSA), indicating different chemical evolution and spatial volume occupation between OH and HINSA. Using the age information of HINSA analysis, OH abundance X(OH) is found to increase linearly with cloud age, which is consistent with previous simulations. Fourteen OH components without corresponding CO emission were detected, implying the effectiveness of OH in tracing the “CO-dark” molecular gas. |
| 语种 | 英语 |
| WOS记录号 | IOP:0067-0049-252-1-ABCA94 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/61441]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Tang,Ningyu |
| 作者单位 | 1.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China 2.Department of Astronomy, School of Physics, Peking University, 100871 Beijing, People’s Republic of China 3.Department of Astronomy, Yunnan University, Kunming 650091, People’s Republic of China 4.Key Laboratory for Research in Galaxies and Cosmology, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China 5.Shanghai Astronomical Observatory, Chinese Academy of Sciences, 80 Nandan Road, Shanghai 200030, People's Republic of China 6.International Centre for Radio Astronomy Research (ICRAR), The University of Western Australia, 35 Stirling Hwy, Crawley, WA 6009, Australia 7.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China 8.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China nytang@nao.cas.cn, dili@nao.cas.cn 9.NAOC-UKZN Computational Astrophysics Centre, University of KwaZulu-Natal, Durban 4000, South Africa 10.Department of Astronomy, University of California, Berkeley, 601 Campbell Hall 3411, Berkeley, CA 94720-3411, USA |
| 推荐引用方式 GB/T 7714 | Tang,Ningyu,Li,Di,Yue,Nannan,et al. OH Evolution in Molecular Clouds[J]. The Astrophysical Journal Supplement Series,2020,252(1). |
| APA | Tang,Ningyu.,Li,Di.,Yue,Nannan.,Zuo,Pei.,Liu,Tie.,...&Heiles,Carl.(2020).OH Evolution in Molecular Clouds.The Astrophysical Journal Supplement Series,252(1). |
| MLA | Tang,Ningyu,et al."OH Evolution in Molecular Clouds".The Astrophysical Journal Supplement Series 252.1(2020). |
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来源：国家天文台
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