Star Formation Occurs in Dense Gas, but What Does "Dense" Mean?
文献类型：期刊论文
| 作者 | Evans, Neal J., II1,2,11; Kim, Kee-Tae1,3; Wu, Jingwen4; Chao, Zhang4; Heyer, Mark5; Liu, Tie1,6; Quang Nguyen-Luo'o'ng7,8,9; Kauffmann, Jens10 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2020-05-01 |
| 卷号 | 894期号:2页码:24 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab8938 |
| 英文摘要 | We report results of a project to map HCN andi emission toward a sample of molecular clouds in the inner Galaxy, all containing dense clumps that are actively engaged in star formation. We compare these two molecular line tracers with millimeter continuum emission and extinction, as inferred from (CO)-C-13, as tracers of dense gas in molecular clouds. The fraction of the line luminosity from each tracer that comes from the dense gas, as measured by mag, varies substantially from cloud to cloud. In all cases, a substantial fraction (in most cases, the majority) of the total luminosity arises in gas below the mag threshold and outside the region of strong millimeter continuum emission. Measurements of toward other galaxies will likely be dominated by such gas at lower surface densities. Substantial, even dominant, contributions to the total line luminosity can arise in gas with densities typical of the cloud as a whole (n similar to 100 cm(-3)). Defining the dense clump from the HCN or emission itself, similarly to previous studies, leads to a wide range of clump properties, with some being considerably larger and less dense than in previous studies. HCN and have a similar ability to trace dense gas for the clouds in this sample. For the two clouds with low virial parameters, (CO)-C-13 is definitely a worse tracer of the dense gas, but for the other four, it is equally good (or bad) at tracing dense gas. |
| WOS关键词 | MOLECULAR CLOUD CORES ; INFRARED DARK CLOUD ; PHYSICAL CONDITIONS ; MILLIMETER ; MULTITRANSITION ; MODELS ; MASER ; EMISSION ; SPECTRA ; HCO+ |
| 资助项目 | NSFC[11590783] ; NSFC[11673029] ; National Key R&D Program of China[2017YFA0402600] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000535595600001 |
| 出版者 | IOP PUBLISHING LTD |
| 资助机构 | NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China ; NSFC ; NSFC ; National Key R&D Program of China ; National Key R&D Program of China |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/54624]  |
| 专题 | 中国科学院国家天文台 |
| 通讯作者 | Evans, Neal J., II |
| 作者单位 | 1.Korea Astron & Space Sci Inst, 776 Daedeokdae Ro, Daejeon 34055, South Korea 2.Kyung Hee Univ, Humanitas Coll, Global Campus, Yongin 17104, South Korea 3.Univ Sci & Technol, Korea UST, 217 Gajeong Ro, Daejeon 34113, South Korea 4.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100012, Peoples R China 5.Univ Massachusetts Amherst, Dept Astron, Amherst, MA 01003 USA 6.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 7.McMaster Univ, 1 James St N, Hamilton, ON L8P 1A2, Canada 8.Nagoya City Univ, Grad Sch Nat Sci, Mizuho Ku, Nagoya, Aichi 4678601, Japan 9.IBM Canada, 120 Bloor St East, Toronto, ON M4Y 1B7, Canada 10.MIT, Haystack Observ, 99 Milstone Rd, Westford, MA 01886 USA |
| 推荐引用方式 GB/T 7714 | Evans, Neal J., II,Kim, Kee-Tae,Wu, Jingwen,et al. Star Formation Occurs in Dense Gas, but What Does "Dense" Mean?[J]. ASTROPHYSICAL JOURNAL,2020,894(2):24. |
| APA | Evans, Neal J., II.,Kim, Kee-Tae.,Wu, Jingwen.,Chao, Zhang.,Heyer, Mark.,...&Kauffmann, Jens.(2020).Star Formation Occurs in Dense Gas, but What Does "Dense" Mean?.ASTROPHYSICAL JOURNAL,894(2),24. |
| MLA | Evans, Neal J., II,et al."Star Formation Occurs in Dense Gas, but What Does "Dense" Mean?".ASTROPHYSICAL JOURNAL 894.2(2020):24. |
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来源：国家天文台
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