4-8 October 2015
Hans Harnack Haus
Europe/Berlin timezone
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Contribution Poster

Poster session

Sulphur-bearing species in molecular clouds

Speakers

  • Prof. Goranka BILALBEGOVIC

Primary authors

Co-authors

  • Dr. Goran BARANOVIC (Rudjer Boskovic Institute, Division of Organic Chemistry and Biochemistry, Zagreb, Croatia)

Content

Using density functional theory methods we studied several molecules that could help in the solution of the missing sulphur problem in dense clouds and circumstellar regions, as well as in the clarification of the sulphur chemistry in comets. We calculated infrared spectra of the following molecules: the trimer (CH$_2$S)$_3$ and the tetramer (CH$_2$S)$_4$ of thioformaldehyde, pentathian S$_5$CH$_2$, hexathiepan S$_6$CH$_2$, thiirane C$_2$H$_4$S, trisulfane HSSSH, and thioacetone (CH$_3$)$_2$CS. 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 (CH$_2$S)$_3$, (CH$_2$S)$_4$, and thiirane C$_2$H$_4$S. The objects whose unidentified infrared features we compared with calculated bands are NGC 253, M82, NGC 1068, Circinus, Arp 220, 30 Doradus, Orion KL, and Sgr B2.