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SMA OBSERVATIONS OF C2H IN HIGH-MASS STAR-FORMING REGIONS
Jiang, Xue-Jian1,2,3,4,5; Liu, Hauyu Baobab6; Zhang, Qizhou3; Wang, Junzhi7; Zhang, Zhi-Yu8,9; Li, Juan7; Gao, Yu1,2; Gu, Qiusheng4,5
2015-08-01
发表期刊ASTROPHYSICAL JOURNAL
卷号808期号:2页码:1-9
摘要C2H is a representative hydrocarbon that is abundant and ubiquitous in the interstellar medium. To study its chemical properties, we present Submillimeter Array observations of the C2H N = 3-2 and. HC3N J = 30-29 transitions. and the 1.1 mm continuum emission toward four OB cluster-forming regions, AFGL 490, ON 1, W33 Main, and G10.6-0.4, which cover a bolometric luminosity range of similar to 10(3)-10(6) L-circle dot. We found that on large scales, the C2H emission traces the dense molecular envelope. However, for all observed sources, the peaks of C2H emission are offset by several times. 104 AU from the peaks of 1.1 mm continuum emission, where the most luminous stars are located. By comparing the distribution and profiles of C2H hyperfine lines and the 1.1 mm continuum emission, we find that the C2H column density (and abundance) around the 1.1 mm continuum peaks is lower than those in the ambient gas envelope. Chemical models suggest that C2H might be transformed to other species owing to increased temperature and density;. thus, its reduced abundance could be the signpost of the heated molecular gas in the similar to 10(4) AU vicinity around the embedded high-mass stars. Our results support such theoretical prediction for centrally embedded similar to 10(3)-10(6) L-circle dot OB star-forming cores, while future higher-resolution observations are required to examine the C2H transformation around the localized sites of high-mass star formation.
文章类型Article
关键词Astrochemistry Ism: Abundances Molecular Processes Stars: Early-type Stars: Formation Stars: Individual (G10.6-0.4 On1 W33 And Afgl 490)
WOS标题词Science & Technology ; Physical Sciences
学科领域天体物理学
DOI10.1088/0004-637X/808/2/114
关键词[WOS]SPATIALLY-RESOLVED CHEMISTRY ; CARBON-CHAIN MOLECULES ; H-II REGIONS ; OB CLUSTERS ; INFRARED OBSERVATIONS ; INTERSTELLAR CLOUDS ; PHYSICAL STRUCTURE ; DENSITY STRUCTURE ; DUST CONTINUUM ; HII REGION
收录类别SCI
语种英语
项目资助者National Natural Science Foundation of China(11390373 ; Strategic Priority Research Program "The Emergence of Cosmological Structures" of the Chinese Academy of Sciences(XDB09000000) ; National Basic Research Program (973 program)(2013CB834905) ; Specialized Research Fund for the Doctoral Program of Higher Education(20100091110009) ; European Research Council (ERC) ; 11273015 ; 11133001 ; 11328301)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000371002400009
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文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/15328
专题期刊(老文献)
作者单位1.Chinese Acad Sci, Purple Mt Observ, 2 W Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, 2 W Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China
3.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
4.Nanjing Univ, Minist Educ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
5.Collaborat Innovat Ctr Modern Astron & Space Expl, Nanjing 210093, Jiangsu, Peoples R China
6.Acad Sinica, Inst Astron & Astrophys, Taipei 106, Taiwan
7.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China
8.Univ Edinburgh, Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland
9.ESO, D-85748 Munich, Germany
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Jiang, Xue-Jian,Liu, Hauyu Baobab,Zhang, Qizhou,et al. SMA OBSERVATIONS OF C2H IN HIGH-MASS STAR-FORMING REGIONS[J]. ASTROPHYSICAL JOURNAL,2015,808(2):1-9.
APA Jiang, Xue-Jian.,Liu, Hauyu Baobab.,Zhang, Qizhou.,Wang, Junzhi.,Zhang, Zhi-Yu.,...&Gu, Qiusheng.(2015).SMA OBSERVATIONS OF C2H IN HIGH-MASS STAR-FORMING REGIONS.ASTROPHYSICAL JOURNAL,808(2),1-9.
MLA Jiang, Xue-Jian,et al."SMA OBSERVATIONS OF C2H IN HIGH-MASS STAR-FORMING REGIONS".ASTROPHYSICAL JOURNAL 808.2(2015):1-9.
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