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    Por favor, use este identificador para citar o enlazar este ítem:https://uvadoc.uva.es/handle/10324/61057

    Título
    First Glycine Isomer Detected in the Interstellar Medium: Glycolamide (NH2C(O)CH2OH)
    Autor
    Rivilla, Víctor M.
    Sanz Novo, MiguelAutoridad UVA
    Jiménez Serra, Izaskun
    Martín Pintado, Jesús
    Colzi, Laura
    Zeng, Shaoshan
    Megías, Andrés
    López Gallifa, Álvaro
    Martínez Henares, Antonio
    Massalkhi, Sarah
    Tercero, Belén
    Vicente, Pablo de
    Martín, Sergio
    Andrés, David San
    Requena Torres, Miguel A.
    Alonso, José Luis
    Año del Documento
    2023
    Editorial
    IOP Publishing
    American Astronomical Society
    Descripción
    Producción Científica
    Documento Fuente
    The Astrophysical Journal Letters, 2023, Volume 953, Number 2
    Résumé
    We report the first detection in the interstellar medium (ISM) of a C2H5O2N isomer: syn-glycolamide (NH2C(O)CH2OH). The exquisite sensitivity at sub-mK levels of an ultradeep spectral survey carried out with the Yebes 40 m and IRAM 30 m telescopes toward the G+0.693–0.027 molecular cloud has allowed us to unambiguously identify multiple transitions of this species. We derived a column density of (7.4 ± 0.7) × 1012 cm−2, which implies a molecular abundance with respect to H2 of 5.5 × 10−11. The other C2H5O2N isomers, including the higher-energy anti conformer of glycolamide and two conformers of glycine, were not detected. The upper limit derived for the abundance of glycine indicates that this amino acid is surely less abundant than its isomer glycolamide in the ISM. The abundances of the C2H5O2N isomers cannot be explained in terms of thermodynamic equilibrium; thus, chemical kinetics need to be invoked. While the low abundance of glycine might not be surprising, based on the relative low abundances of acids in the ISM compared to other compounds (e.g., alcohols, aldehydes, or amines), several chemical pathways can favor the formation of its isomer glycolamide. It can be formed through radical–radical reactions on the surface of dust grains. The abundances of these radicals can be significantly boosted in an environment affected by a strong ultraviolet field induced by cosmic rays, such as that expected in G+0.693–0.027. Therefore, as shown by several recent molecular detections toward this molecular cloud, it stands out as the best target to discover new species with carbon, oxygen, and nitrogen with increasing chemical complexity.
    Materias Unesco
    21 Astronomía y Astrofísica
    Palabras Clave
    Isómero de glicina
    Glycine Isomer
    Glycolamide (NH2C(O)CH2OH)
    ISSN
    2041-8205
    Revisión por pares
    SI
    DOI
    10.3847/2041-8213/ace977
    Patrocinador
    Universidad de Valladolid. Beca postdoctoral Margarita Salas
    Ministerio de Ciencia e Innovación/Agencia Estatal de Investigación (proyecto RYC2020-029387-I)
    Ministerio de Ciencia e Innovación (PID2020-117742GB-I00)
    Ministerio de Ciencia e Innovación (proyecto PID2019-107115GB-C21)
    Ministerio de Ciencia e Innovación (PID2019-106235GB-I00)
    Version del Editor
    https://iopscience.iop.org/article/10.3847/2041-8213/ace977
    Propietario de los Derechos
    © 2023 The Authors
    Idioma
    eng
    URI
    https://uvadoc.uva.es/handle/10324/61057
    Tipo de versión
    info:eu-repo/semantics/publishedVersion
    Derechos
    openAccess
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    • DEP63 - Artículos de revista [324]
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    First-Glycine-Isome.pdf
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    Atribución 4.0 InternacionalExcepté là où spécifié autrement, la license de ce document est décrite en tant que Atribución 4.0 Internacional

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