Thiols in the ISM: first detection of HC(O)SH and confirmation of C₂H₅SH.

ABSTRACT: 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 betwee

SUBMITTER: Rodriguez-Almeida LF 

PROVIDER: S-EPMC7611195 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature