{
  "id": "2104.08036",
  "version": "v1",
  "published": "2021-04-16T11:14:16.000Z",
  "updated": "2021-04-16T11:14:16.000Z",
  "title": "Thiols in the ISM: first detection of HC(O)SH and confirmation of C$_2$H$_5$SH",
  "authors": [
    "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"
  ],
  "comment": "16 pages, 6 figures, article accepted in Astrophysical Journal Letters",
  "categories": [
    "astro-ph.GA"
  ],
  "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 $\\sim\\,$1$\\,\\times\\,$10$^{-10}$. Additionally, we provide a solid confirmation of the gauche isomer of ethyl mercaptan (g-C$_2$H$_5$SH) with an abundance of $\\sim\\,$3$\\,\\times\\,$10$^{-10}$, and we also detect methyl mercaptan (CH$_3$SH) with an abundance of $\\sim\\,$5$\\,\\times\\,$10$^{-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.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-04-16T11:14:16.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "first detection",
      "confirmation",
      "galactic centre quiescent cloud",
      "detect methyl mercaptan",
      "prebiotic studies"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 16,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}