Rotation of Two Micron All Sky Survey Clumps in Molecular Clouds
文献类型：期刊论文
| 作者 | Xu,Xuefang1,2; Li,Di1,2,3 ; Dai,Y. Sophia4; Goldsmith,Paul F.5; Fuller,Gary A.6
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2020-07-30 |
| 卷号 | 898期号:2 |
| 关键词 | Interstellar medium Interstellar dynamics Interstellar molecules Intercloud medium Interstellar emissions |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab9a45 |
| 英文摘要 | Abstract We have analyzed the rotational properties of 12 clumps using 13CO (1–0) and C18O (1–0) maps of the Five College Radio Astronomy Observatory 13.7 m radio telescope. The clumps, located within molecular clouds, have radii (R) in the range of 0.06–0.27 pc. The direction of clump elongation is not correlated with the direction of the velocity gradient. We measured the specific angular momentum (J/M) to be between 0.0022–0.025 pc km s?1 based on 13CO images, and between 0.0025–0.021 pc km s?1 based on C18O images. The consistency of J/M based on different tracers indicates the 13CO and C18O in dense clumps trace essentially the same material despite significantly different opacities. We also found that J/M increases monotonically as a function of R in power-law form, . The ratio between rotation energy and gravitational energy, β, ranges from 0.0012 to 0.018. The small values of β imply that rotation alone is not sufficient to support the clump against gravitational collapse. |
| 语种 | 英语 |
| WOS记录号 | IOP:0004-637X-898-2-AB9A45 |
| 出版者 | The American Astronomical Society |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/63216]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.CAS Key Laboratory of FAST, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China; xfxu@nao.cas.cn, dili@nao.cas.cn 2.University of Chinese Academy of Sciences, Beijing 100049, People's Republic of China 3.NAOC-UKZN Computational Astrophysics Centre, University of KwaZulu-Natal, Durban 4000, South Africa 4.Chinese Academy of Sciences South America Center for Astronomy (CASSACA), NAOC, Beijing 100101, People's Republic of China; ydai@nao.cas.cn 5.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA 6.Jodrell Bank Centre for Astrophysics, Department of Physics and Astronomy, University of Manchester, Oxford Road, Manchester, M13 9PL, UK |
| 推荐引用方式 GB/T 7714 | Xu,Xuefang,Li,Di,Dai,Y. Sophia,et al. Rotation of Two Micron All Sky Survey Clumps in Molecular Clouds[J]. The Astrophysical Journal,2020,898(2). |
| APA | Xu,Xuefang,Li,Di,Dai,Y. Sophia,Goldsmith,Paul F.,&Fuller,Gary A..(2020).Rotation of Two Micron All Sky Survey Clumps in Molecular Clouds.The Astrophysical Journal,898(2). |
| MLA | Xu,Xuefang,et al."Rotation of Two Micron All Sky Survey Clumps in Molecular Clouds".The Astrophysical Journal 898.2(2020). |
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来源：国家天文台
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