Sulfur-bearing species in molecular clouds

Bilalbegović, Goranka and Baranović, Goran (2015) Sulfur-bearing species in molecular clouds. Monthly Notices of the Royal Astronomical Society, 446 (3). pp. 3118-3129. ISSN 0035-8711

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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.

Item Type: Article
Keywords: astrophysical molecules; infrared spectra; interstellar medium; galaxies; density functional theory
Date: 2015
Subjects: NATURAL SCIENCES > Physics > Astronomy and Astrophysics
Additional Information: © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Divisions: Faculty of Science > Department of Physics
Publisher: Oxford University Press
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 07 Sep 2017 12:42
Last Modified: 07 Sep 2017 12:42

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