MOLECULAR CLOUDS IN THE NORTH AMERICAN AND PELICAN NEBULAE: STRUCTURES
文献类型：期刊论文
| 作者 | Zhang, Shaobo1,2,3; Xu, Ye1,2 ; Yang, Ji1,2
|
| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2014-03-01 |
| 卷号 | 147期号:3页码:0 |
| ISSN号 | 0004-6256 |
| 关键词 | ISM: kinematics and dynamics ISM: molecules stars: formation |
| 英文摘要 | We present observations of a 4.25 deg(2) area toward the North American and Pelican Nebulae in the J = 1-0 transitions of (CO)-C-12, (CO)-C-13, and (CO)-O-18. Three molecules show different emission areas with their own distinct structures. These different density tracers reveal several dense clouds with a surface density of over 500 M-circle dot pc(-2) and a mean H-2 column density of 5.8, 3.4, and 11.9 x 10(21) cm(-2) for (CO)-C-12, (CO)-C-13, and (CO)-O-18, respectively. We obtain a total mass of 5.4 x 104 M-circle dot ((CO)-C-12), 2.0 x 10(4) M-circle dot ((CO)-C-13), and 6.1 x 10(3) M-circle dot ((CO)-O-18) in the complex. The distribution of excitation temperature shows two phases of gas: cold gas (similar to 10 K) spreads across the whole cloud; warm gas (>20 K) outlines the edge of the cloud heated by the W80 H II region. The kinetic structure of the cloud indicates an expanding shell surrounding the ionized gas produced by the H II region. There are six discernible regions in the cloud: the Gulf of Mexico, Caribbean Islands and Sea, and Pelican's Beak, Hat, and Neck. The areas of (CO)-C-13 emission range within 2-10 pc(2) with mass of (1-5) x 10(3) M-circle dot and line width of a few km s(-1). The different line properties and signs of star-forming activity indicate they are in different evolutionary stages. Four filamentary structures with complicated velocity features are detected along the dark lane in LDN 935. Furthermore, a total of 611 molecular clumps within the (CO)-C-13 tracing cloud are identified using the ClumpFind algorithm. The properties of the clumps suggest that most of the clumps are gravitationally bound and at an early stage of evolution with cold and dense molecular gas. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | H II REGIONS ; STAR-FORMATION ; MASS FUNCTION ; PHYSICAL CONDITIONS ; RADIO-ASTRONOMY ; CO OBSERVATIONS ; CORES ; TAURUS ; EVOLUTION ; CYGNUS |
| 收录类别 | SCI |
| 原文出处 | 10.1088/0004-6256/147/3/46 |
| 语种 | 英语 |
| WOS记录号 | WOS:000331125600001 |
| 公开日期 | 2014-11-20 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/10572]  |
| 专题 | 紫金山天文台_分子云与恒星形成研究团组 |
| 作者单位 | 1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China 3.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Shaobo,Xu, Ye,Yang, Ji. MOLECULAR CLOUDS IN THE NORTH AMERICAN AND PELICAN NEBULAE: STRUCTURES[J]. ASTRONOMICAL JOURNAL,2014,147(3):0. |
| APA | Zhang, Shaobo,Xu, Ye,&Yang, Ji.(2014).MOLECULAR CLOUDS IN THE NORTH AMERICAN AND PELICAN NEBULAE: STRUCTURES.ASTRONOMICAL JOURNAL,147(3),0. |
| MLA | Zhang, Shaobo,et al."MOLECULAR CLOUDS IN THE NORTH AMERICAN AND PELICAN NEBULAE: STRUCTURES".ASTRONOMICAL JOURNAL 147.3(2014):0. |
入库方式： OAI收割
来源：紫金山天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。