arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1410.8293astro-ph.SRastro-ph.GAphysics.atm-clusphysics.chem-ph
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分子云中的含硫物质

Sulfur-bearing species in molecular clouds

G. Bilalbegovic, G. Baranovic

摘要:

我们研究了几种分子,这些分子可以帮助解决稠密云层和星周区域中缺少硫的问题,以及澄清彗星中的硫化学。这些硫分子是:三聚体(CH 2S)3和四聚体(CH 2S)4,它们是硫代甲醛、五硫杂环庚烷S5 CH 2、六硫杂环庚烷S6 CH 2、硫杂环丙烷C2 H4 S、三硫烷HSSSH和硫代丙酮(CH 3)2CS。用密度泛函理论计算了这些化合物的红外光谱。大多数计算的波段属于中红外,其中一些发生在近红外和远红外区域。我们认为红外空间天文台在几个活动星系核和星暴星系中观测到的一些未识别的光谱特征可能是由1,3,5-三硫杂环己烷((CH_2S)_3),1,3,5,7-四硫杂环己烷((CH_2S)_4)和硫杂环丙烷(C_2H_4S)引起的。与计算波段比较的未识别红外特征的天体是:NGC 253,M82,NGC 1068,Circinus,Arp 220,30 Doradus,Orion KL和Sgr B2。

英文摘要:

We study several molecules that could help in the solution of the missing sulfur problem in dense clouds and circumstellar regions, as well as in the clarification of the sulfur chemistry in comets. These sulfur molecules are: the trimer (CH2S)3 and the tetramer (CH2S)4 of thioformaldehyde, pentathian S5CH2, hexathiepan S6CH2, thiirane C2H4S, trisulfane HSSSH, and thioacetone (CH3)2CS. Infrared spectra of these species are calculated using density functional theory methods. The majority of calculated bands belong to the mid-infrared, with some of them occurring in the near and far-infrared region. We suggest that some of unidentified spectral features measured by Infrared Space Observatory in several active galactic nuclei and starburst galaxies could be caused by 1,3,5-trithiane ((CH2S)3), 1,3,5,7-tetrathiocane ((CH2S)4), and thiirane (C2H4S). The objects whose unidentified infrared features we compare with calculated bands are: NGC 253, M82, NGC 1068, Circinus, Arp 220, 30 Doradus, Orion KL, and Sgr B2.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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