SULFUR-BEARING MOLECULES IN MASSIVE STAR-FORMING REGIONS: OBSERVATIONS OF OCS, CS, H2S, AND SO

被引:29
|
作者
Li, Juan [1 ]
Wang, Junzhi [1 ]
Zhu, Qingfeng [2 ]
Zhang, Jiangshui [3 ]
Li, Di [4 ,5 ]
机构
[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
来源
ASTROPHYSICAL JOURNAL | 2015年 / 802卷 / 01期
关键词
ISM: abundances; ISM: clouds; ISM: molecules; molecular processes; radio lines: ISM; COLOGNE DATABASE; LINE EMISSION; DARK CLOUDS; ULTRACOMPACT; CHEMISTRY; ORION; SPECTROSCOPY; ENVELOPES; TURBULENT; EVOLUTION;
D O I
10.1088/0004-637X/802/1/40
中图分类号
P1 [天文学];
学科分类号
0704 ;
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.
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页数:13
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