- Press Release
- October 4, 2022
Thiols In The ISM: First Detection Of HC(O)SH And Confirmation Of C2H5SH
The chemical compounds carrying the thiol group (-SH) have been considered essential in recent prebiotic studies regarding the polymerization of amino acids.
We have searched for this kind of compounds toward the Galactic Centre quiescent cloud G+0.693-0.027. We report the first detection in the interstellar space of the trans-isomer of monothioformic acid (t-HC(O)SH) with an abundance of ∼1×10−10. Additionally, we provide a solid confirmation of the gauche isomer of ethyl mercaptan (g-C2H5SH) with an abundance of ∼3×10−10, and we also detect methyl mercaptan (CH3SH) with an abundance of ∼5×10−9. Abundance ratios were calculated for the three SH-bearing species and their OH-analogues, revealing similar trends between alcohols and thiols with increasing complexity.
Possible chemical routes for the interstellar synthesis of t-HC(O)SH, CH3SH and C2H5SH are discussed, as well as the relevance of these compounds in the synthesis of prebiotic proteins in the primitive Earth.
Lucas F. Rodríguez-Almeida, Izaskun Jiménez-Serra, Víctor M. Rivilla, Jesús Martín-Pintado, Shaoshan Zeng, Belén Tercero, Pablo de Vicente, Laura Colzi, Fernando Rico-Villas, Sergio Martín, Miguel A. Requena-Torres
Comments: 16 pages, 6 figures, article accepted in Astrophysical Journal Letters
Subjects: Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:2104.08036 [astro-ph.GA] (or arXiv:2104.08036v1 [astro-ph.GA] for this version)
From: Lucas F. Rodríguez-Almeida
[v1] Fri, 16 Apr 2021 11:14:16 UTC (284 KB)