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Observational studies of S-bearing molecules in massive star-forming regions

文献类型：期刊论文

作者Luo, R.5; Wang, J. Z.5; Zhang, X.6; Quan, D. H.1; Jiang, X. J.1; Li, J.2; Gou, Q.3; Li, Y. Q.2; Xu, Y. N.5; Zheng, S. Q.2
刊名ASTRONOMY & ASTROPHYSICS
出版日期2024-11-29
卷号691页码:A359
关键词ISM: abundances ISM: clouds ISM: molecules
ISSN号0004-6361
DOI10.1051/0004-6361/202449477
产权排序2
英文摘要Context. S-bearing molecules are powerful tools for determining the physical conditions inside a massive star-forming region. The abundances of S-bearing molecules, including H2S, H2CS, and HCS+, are highly dependent on physical and chemical changes, which means that they are good tracers of the evolutionary stage of massive star formation. Aims. We present observational results of H2S 1(10)-1(01), (H2S)-S-34 1(10)-1(01), H2CS 5(14)-4(14), HCS+ 4-3, SiO 4-3, HC3N 19-18, and (CO)-O-18 1-0 toward a sample of 51 late-stage massive star-forming regions, and study the relationships between H2S, H-2 CS, HCS+, and SiO in hot cores. We discuss the chemical connections of these S-bearing molecules based on the relations between the relative abundances in our sources. Methods. (H2S)-S-34 1(10)-1(01), as the isotopic line of H2S 1(10)-1(01), was used to correct the optical depths ofH(2)S 1(10)-1(01). Beam-averaged column densities of all molecules were calculated, as were the abundances of H2S, H2CS, and HCS+ relative to H-2, which were derived from C-18 O. Results from a chemical model that included gas, dust grain surface, and icy mantle phases, were compared with the observed abundances of H2S, H2CS, and HCS+ molecules. Results. H2S 1(10)-1(01), (H2S)-S-34 1(10)-1(01), H2CS 5(14)-4(14), HCS+ 4-3, andHC(3)N 19-18 were detected in 50 of the 51 sources, SiO 4-3 was detected in 46 sources, and (CO)-O-18 1-0 was detected in all sources. The Pearson correlation coefficients between H2CS and HCS+ normalized by H-2 and H2S are 0.94 and 0.87, respectively, and a tight linear relationship with a slope of 1.00 and 1.09 is found; this relationship is 0.77 and 0.98 between H2S and H2CS and 0.76 and 0.97 between H2S and HCS+. The full widths at half maxima of (H2S)-S-34 1(10)-1(01), H2CS 5(14)-4(14), HCS+ 4-3, and HC3N 19-18 in each source are similar to each other, which indicates that they may trace similar regions. By comparing the observed abundance with model results, we see that there is one possible time (2-3 x 10(5) yr) a which each source in the model matches the measured abundances of H2S, H2CS, and HCS+. The abundances of HCS+, H2CS, and H2S increase with the SiO abundance in these sources, which implies that shock chemistry may be playing a large role. Conclusions. The close abundance relation of H2S, H2CS, and HCS+ and the similar line widths in observational results indicate that these three molecules could be chemically linked, with HCS+ and H2CS the most correlated. The comparison of the observational results with chemical models shows that the abundances can be reproduced for almost all the sources at a specific time. The observational results, including the abundances in these sources need to be considered in further modeling of H2S, H2CS, and HCS+ in hot cores with shock chemistry.
WOS关键词SULFUR CHEMISTRY ; LINE SURVEY ; CHEMICAL-COMPOSITION ; HOT CORES ; ORION-KL ; INTERSTELLAR ; GAS ; CLOUDS ; PHASE ; ABUNDANCES
资助项目National Key R&D Program of China[2023YFA1608204] ; National Natural Science Foundation of China[12373026] ; Leading Innovation and Entrepreneurship Team of Zhejiang Province of China[2023R01008] ; Key R&D Program of Zhejiang, China[2024SSYS0012] ; Key R&D Program of Zhejiang, China[012-16] ; Key R&D Program of Zhejiang, China[023-17] ; Key R&D Program of Zhejiang, China[005-20] ; INSU/CNRS (France) ; MPG (Germany) ; IGN (Spain)
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001367285500001
出版者EDP SCIENCES S A
资助机构National Key R&D Program of China ; National Natural Science Foundation of China ; Leading Innovation and Entrepreneurship Team of Zhejiang Province of China ; Key R&D Program of Zhejiang, China ; INSU/CNRS (France) ; MPG (Germany) ; IGN (Spain)
源URL[http://ir.xao.ac.cn/handle/45760611-7/7251]  
专题天体化学研究团组
通讯作者Wang, J. Z.
作者单位1.Zhejiang Lab, Res Ctr Astron Comp, Hangzhou 311121, Peoples R China
2.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
3.Chongqing Univ, Sch Chem & Chem Engn, Daxuecheng South Rd 55, Chongqing 401331, Peoples R China
4.Anhui Normal Univ, Dept Phys, Wuhu 241002, Anhui, Peoples R China
5.Guangxi Univ, Sch Phys Sci & Technol, Guangxi Key Lab Relativist Astrophys, Nanning 530004, Peoples R China
6.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1-St, Urumqi 830011, Xinjiang, Peoples R China
推荐引用方式
GB/T 7714		 Luo, R.,Wang, J. Z.,Zhang, X.,et al. Observational studies of S-bearing molecules in massive star-forming regions[J]. ASTRONOMY & ASTROPHYSICS,2024,691:A359.
APA Luo, R..,Wang, J. Z..,Zhang, X..,Quan, D. H..,Jiang, X. J..,...&Liu, Y. J..(2024).Observational studies of S-bearing molecules in massive star-forming regions.ASTRONOMY & ASTROPHYSICS,691,A359.
MLA Luo, R.,et al."Observational studies of S-bearing molecules in massive star-forming regions".ASTRONOMY & ASTROPHYSICS 691(2024):A359.

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来源：新疆天文台

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