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题名: SMA OBSERVATIONS OF C2H IN HIGH-MASS STAR-FORMING REGIONS
作者: Jiang, Xue-Jian1, 2, 3, 4, 5; Liu, Hauyu Baobab6; Zhang, Qizhou3; Wang, Junzhi7; Zhang, Zhi-Yu8, 9; Li, Juan7; Gao Yu(高煜)1, 2; Gu, Qiusheng4, 5
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2015-08-01
卷号: 808, 期号:2, 页码:1-9
关键词: astrochemistry ; ISM: abundances ; molecular processes ; stars: early-type ; stars: formation ; stars: individual (G10.6-0.4, ON1, W33, and AFGL 490)
学科分类: 天体物理学
DOI: 10.1088/0004-637X/808/2/114
文章类型: Article
英文摘要: 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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
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
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)
语种: 英语
WOS记录号: WOS:000371002400009
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15328
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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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