Sulfur-bearing species in molecular clouds

Abstract

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.

arXiv commentaccepted for publication in MNRAS

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Cited by in corpus (7)

• Detection of CH3SH in protostar IRAS 16293-2422
• ExoMol molecular line lists XII: Line Lists for 8 isotopologues of CS
• X-ray extinction from interstellar dust: Prospects of observing carbon, sulfur and other trace elements
• Searches for Interstellar HCCSH and H${}_2$CCS
• The mid-infrared molecular inventory towards Orion IRc2
• Gas phase detection and rotational spectroscopy of ethynethiol, HCCSH
• The Si+SO${}_2$ collision and an extended network of neutral-neutral reactions between silicon and sulphur bearing species