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LARGE-SCALE KINEMATICS, ASTROCHEMISTRY, AND MAGNETIC FIELD STUDIES OF MASSIVE STAR-FORMING REGIONS THROUGH HC3N, HNC, AND C2H MAPPINGS
Li, Juan1,2; Wang, Junzhi1,2; Gu, Qiusheng1,2; Zhang, Zhi-yu3,4,5; Zheng, Xingwu1,2
2012-01-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume745Issue:1Pages:47(29pp)
AbstractWe have mapped 27 massive star-forming regions associated with water masers using three dense gas tracers: HC3N 10-9, HNC 1-0, and C2H 1-0. The FWHM sizes of HNC clumps and C2H clumps are about 1.5 and 1.6 times higher than those of HC3N, respectively, which can be explained by the fact that HC3N traces more dense gas than HNC and C2H. We found evidence for an increase in the optical depth of C2H with a "radius" from the center to the outer regions in some targets, supporting the chemical model of C2H. The C2H optical depth is found to decline as molecular clouds evolve to a later stage, suggesting that C2H might be used as a "chemical clock" for molecular clouds. The large-scale kinematic structure of clouds was investigated with three molecular lines. All of these sources show significant velocity gradients. The magnitudes of gradient are found to increase toward the inner region, indicating the differential rotation of clouds. Both the ratio of rotational to gravitational energy and the specific angular momentum seem to decrease toward the inner region, implying the obvious angular momentum transfer, which might be caused by magnetic braking. The average magnetic field strength and number density of molecular clouds is derived using the uniform magnetic sphere model. The derived magnetic field strengths range from 3 to 88 mu G, with a median value of 13 mu G. The mass-to-flux ratio of the molecular cloud is calculated to be much higher than the critical value with derived parameters, which agrees well with numerical simulations.
KeywordIsm: Clouds Ism: Kinematics And Dynamics Ism: Molecules Stars: Formation
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/745/1/47
WOS KeywordH-II REGIONS ; ULTRACOMPACT HII-REGIONS ; MOLECULAR CLOUD CORES ; DARK CLOUDS ; AMBIPOLAR DIFFUSION ; ANGULAR-MOMENTUM ; WATER MASERS ; DENSE CORES ; TRIGONOMETRIC PARALLAXES ; INTERSTELLAR CLOUDS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000300316600047
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8038
Collection太阳高能及相关物理过程研究团组
Affiliation1.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210093, Peoples R China
2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Minist Educ, Nanjing 210093, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
4.Max Planck Inst Radioastron, D-53121 Bonn, Germany
5.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Li, Juan,Wang, Junzhi,Gu, Qiusheng,et al. LARGE-SCALE KINEMATICS, ASTROCHEMISTRY, AND MAGNETIC FIELD STUDIES OF MASSIVE STAR-FORMING REGIONS THROUGH HC3N, HNC, AND C2H MAPPINGS[J]. ASTROPHYSICAL JOURNAL,2012,745(1):47(29pp).
APA Li, Juan,Wang, Junzhi,Gu, Qiusheng,Zhang, Zhi-yu,&Zheng, Xingwu.(2012).LARGE-SCALE KINEMATICS, ASTROCHEMISTRY, AND MAGNETIC FIELD STUDIES OF MASSIVE STAR-FORMING REGIONS THROUGH HC3N, HNC, AND C2H MAPPINGS.ASTROPHYSICAL JOURNAL,745(1),47(29pp).
MLA Li, Juan,et al."LARGE-SCALE KINEMATICS, ASTROCHEMISTRY, AND MAGNETIC FIELD STUDIES OF MASSIVE STAR-FORMING REGIONS THROUGH HC3N, HNC, AND C2H MAPPINGS".ASTROPHYSICAL JOURNAL 745.1(2012):47(29pp).
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