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MOLECULAR CLOUDS IN THE NORTH AMERICAN AND PELICAN NEBULAE: STRUCTURES
Zhang, Shaobo1,2,3; Xu, Ye1,2; Yang, Ji1,2
2014-03-01
Source PublicationASTRONOMICAL JOURNAL
ISSN0004-6256
Volume147Issue:3Pages:0
AbstractWe 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.
KeywordIsm: Kinematics And Dynamics Ism: Molecules Stars: Formation
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-6256/147/3/46
WOS KeywordH II REGIONS ; STAR-FORMATION ; MASS FUNCTION ; PHYSICAL CONDITIONS ; RADIO-ASTRONOMY ; CO OBSERVATIONS ; CORES ; TAURUS ; EVOLUTION ; CYGNUS
URL查看原文
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000331125600001
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10572
Collection分子云与恒星形成研究团组
Affiliation1.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
Recommended Citation
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.
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