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题名: SULFUR-BEARING MOLECULES IN MASSIVE STAR-FORMING REGIONS: OBSERVATIONS OF OCS, CS, H2S, AND SO
作者: Li, Juan1; Wang, Junzhi1; Zhu, Qingfeng2; Zhang, Jiangshui3; Li, Di4, 5
刊名: ASTROPHYSICAL JOURNAL
出版日期: 2015-03-20
卷号: 802, 期号:1
关键词: ISM: abundances ; ISM: clouds ; ISM: molecules ; molecular processes ; radio lines: ISM
DOI: 10.1088/0004-637X/802/1/40
文章类型: Article
英文摘要: We studied the sulfur chemistry of massive star-forming regions through single-dish submillimeter spectroscopy. OCS, (OCS)-C-13, (CS)-C-13, H2S, and SO transitions were observed toward a sample of massive star-forming regions with embedded UCH II or CH II regions. These sources could be divided into H II-hot core and H II-only sources based on their CH3CN emission. Our results show that the OCS line of thirteen sources is optically thick, with optical depth ranging from 5 to 16. Column densities of these molecules were computed under LTE conditions. CS column densities were also derived using its optically thin isotopologue (CS)-C-13. H2S is likely to be the most abundant gas-phase sulfuretted molecule in hot massive cores. Both the column density and abundance of sulfur-bearing molecules decrease significantly from H II-hot core to H II-only sources. Ages derived from hot core models appear to be consistent with star formation theories, suggesting that abundance ratios of [CS]/[SO], [SO]/[OCS], and [OCS]/[CS] could be used as chemical clocks in massive star-forming regions.
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 ; INFRARED DARK CLOUDS ; HII-REGIONS ; COLOGNE DATABASE ; LINE EMISSION ; HOT CORES ; ULTRACOMPACT ; CHEMISTRY ; ORION ; SPECTROSCOPY
收录类别: SCI
语种: 英语
WOS记录号: WOS:000351834700040
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15782
Appears in Collections:毫米波和亚毫米波技术实验室_期刊论文

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作者单位: 1.Shanghai Astron Observ, Shanghai 20030, Peoples R China
2.Chinese Acad Sci, Univ Sci & Technol, Dept Astron, Hefei 210008, Peoples R China
3.Guangzhou Univ, Ctr Astrophys, Guangzhou 510006, Guangdong, Peoples R China
4.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
5.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
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