Thiols in the ISM: first detection of HC(O)SH and confirmation of C 2 H 5 SH.

Autor: Rodríguez-Almeida LF; Centro de Astrobiolog'a (CSIC-INTA), Ctra Ajalvir km 4, 28850, Torrejon de Ardoz, Madrid, Spain., Jimenéz-Serra I; Centro de Astrobiolog'a (CSIC-INTA), Ctra Ajalvir km 4, 28850, Torrejon de Ardoz, Madrid, Spain., Rivilla VM; Centro de Astrobiolog'a (CSIC-INTA), Ctra Ajalvir km 4, 28850, Torrejon de Ardoz, Madrid, Spain.; INAF-Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, 50125, Florence, Italy., Martín-Pintado J; Centro de Astrobiolog'a (CSIC-INTA), Ctra Ajalvir km 4, 28850, Torrejon de Ardoz, Madrid, Spain., Zeng S; Star and Planet Formation Laboratory, Cluster for Pioneering Research, RIKEN,2-1 Hirosawa, Wako, Saitama, 351-0198, Japan., Tercero B; Observatorio de Yebes (IGN), Cerro de la Palera s/n, 19141, Guadalajara, Spain., de Vicente P; Observatorio de Yebes (IGN), Cerro de la Palera s/n, 19141, Guadalajara, Spain., Colzi L; Centro de Astrobiolog'a (CSIC-INTA), Ctra Ajalvir km 4, 28850, Torrejon de Ardoz, Madrid, Spain.; INAF-Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, 50125, Florence, Italy., Rico-Villas F; Centro de Astrobiolog'a (CSIC-INTA), Ctra Ajalvir km 4, 28850, Torrejon de Ardoz, Madrid, Spain., Martín S; Eureopean Southern Observatory, Alonso de Cordova 3107, Vitacura 763 0355, Santiago, Chile.; Joint ALMA Observatory, Alonso de Cordova 3107, Vitacura 763 0355, Santiago, Chile., Requena-Torres MA; University of Maryland, College Park, ND 20742-2421, USA.; Department of Physics, Astronomy and Geosciences, Towson University, MD 21252, USA.
Jazyk: angličtina
Zdroj: The astrophysical journal. Letters [Astrophys J Lett] 2021 Apr 30; Vol. 912 (1). Date of Electronic Publication: 2021 Apr 30 (Print Publication: 2021).
DOI: 10.3847/2041-8213/abf7cb
Abstrakt: 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-C 2 H 5 SH) with an abundance of ~ 3 × 10 -10 , and we also detect methyl mercaptan (CH 3 SH) 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, CH 3 SH and C 2 H 5 SH are discussed, as well as the relevance of these compounds in the synthesis of prebiotic proteins in the primitive Earth.
Databáze: MEDLINE
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