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Gas phase Elemental...
Gas phase Elemental abundances in Molecular cloudS (GEMS): III. Unlocking the CS chemistry: The CS+O reaction
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- Bulut, N. (author)
- Firat Üniversitesi,Firat University
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- Roncero, O. (author)
- CSIC - Instituto de Fisica Fundamental (IFF)
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- Aguado, A. (author)
- Universidad Autonoma de Madrid (UAM)
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- Loison, J. C. (author)
- Université de Bordeaux,University of Bordeaux
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- Navarro-Almaida, D. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Wakelam, V. (author)
- Université de Bordeaux,University of Bordeaux
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- Fuente, A. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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Roueff, Evelyne (author)
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- Gal, R. Le (author)
- Harvard-Smithsonian Center for Astrophysics
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- Caselli, P. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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Gerin, M. (author)
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- Hickson, K. M. (author)
- Université de Bordeaux,University of Bordeaux
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- Spezzano, S. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Riviere-Marichalar, P. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Alonso-Albi, T. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Bachiller, R. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Jimenez-Serra, I. (author)
- Centro de Astrobiologia (CAB)
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- Kramer, C. (author)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Tercero, B. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN),Observatorio de Yebes (IGN),Yebes Observatory
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- Rodríguez-Baras, M. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Burillo, S. G. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Goicoechea, J.R. (author)
- CSIC - Instituto de Fisica Fundamental (IFF)
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- Treviño Morales, Sandra, 1985 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Esplugues, G. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Cazaux, S. (author)
- Technische Universiteit Delft,Delft University of Technology (TU Delft)
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- Commerçon, B. (author)
- École Normale Supérieure de Lyon
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- Laas, J. C. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Kirk, J. (author)
- University of Central Lancashire
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- Lattanzi, V. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Martín-Doménech, R. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Muñoz-Caro, G. (author)
- Centro de Astrobiologia (CAB)
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- Pineda, J. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Ward-Thompson, D. (author)
- University of Central Lancashire
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- Tafalla, M. (author)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Marcelino, N. (author)
- CSIC - Instituto de Fisica Fundamental (IFF)
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- Malinen, J. (author)
- Universität zu Köln,University of Cologne,Helsingin Yliopisto,University of Helsinki
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- Friesen, R. (author)
- National Radio Astronomy Observatory
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- Giuliano, B. M. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Agundez, M. (author)
- CSIC - Instituto de Fisica Fundamental (IFF)
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- Hacar, A. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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(creator_code:org_t)
- 2021-02-02
- 2021
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 646
- Related links:
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https://helda.helsin...
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https://research.cha...
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https://doi.org/10.1...
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Abstract
Subject headings
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- Context. Carbon monosulphide (CS) is among the most abundant gas-phase S-bearing molecules in cold dark molecular clouds. It is easily observable with several transitions in the millimeter wavelength range, and has been widely used as a tracer of the gas density in the interstellar medium in our Galaxy and external galaxies. However, chemical models fail to account for the observed CS abundances when assuming the cosmic value for the elemental abundance of sulfur. Aims. The CS+O → CO + S reaction has been proposed as a relevant CS destruction mechanism at low temperatures, and could explain the discrepancy between models and observations. Its reaction rate has been experimentally measured at temperatures of 150-400 K, but the extrapolation to lower temperatures is doubtful. Our goal is to calculate the CS+O reaction rate at temperatures <150 K which are prevailing in the interstellar medium. Methods. We performed ab initio calculations to obtain the three lowest potential energy surfaces (PES) of the CS+O system. These PESs are used to study the reaction dynamics, using several methods (classical, quantum, and semiclassical) to eventually calculate the CS + O thermal reaction rates. In order to check the accuracy of our calculations, we compare the results of our theoretical calculations for T ~ 150-400 K with those obtained in the laboratory. Results. Our detailed theoretical study on the CS+O reaction, which is in agreement with the experimental data obtained at 150-400 K, demonstrates the reliability of our approach. After a careful analysis at lower temperatures, we find that the rate constant at 10 K is negligible, below 10-15 cm s-1, which is consistent with the extrapolation of experimental data using the Arrhenius expression. Conclusions. We use the updated chemical network to model the sulfur chemistry in Taurus Molecular Cloud 1 (TMC 1) based on molecular abundances determined from Gas phase Elemental abundances in Molecular CloudS (GEMS) project observations. In our model, we take into account the expected decrease of the cosmic ray ionization rate, ζH2, along the cloud. The abundance of CS is still overestimated when assuming the cosmic value for the sulfur abundance.
Subject headings
- NATURVETENSKAP -- Kemi -- Oorganisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Inorganic Chemistry (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Kemi -- Teoretisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)
Keyword
- Astrochemistry
- ISM: Abundances
- ISM: Clouds
- Molecular processes
- ISM: Molecules
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Bulut, N.
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Roncero, O.
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Aguado, A.
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Loison, J. C.
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Navarro-Almaida, ...
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Wakelam, V.
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show more...
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Fuente, A.
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Roueff, Evelyne
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Gal, R. Le
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Caselli, P.
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Gerin, M.
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Hickson, K. M.
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Spezzano, S.
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Riviere-Marichal ...
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Alonso-Albi, T.
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Bachiller, R.
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Jimenez-Serra, I ...
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Kramer, C.
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Tercero, B.
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Rodríguez-Baras, ...
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Burillo, S. G.
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Goicoechea, J.R.
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Treviño Morales, ...
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Esplugues, G.
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Cazaux, S.
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Commerçon, B.
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Laas, J. C.
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Kirk, J.
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Lattanzi, V.
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Martín-Doménech, ...
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Muñoz-Caro, G.
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Pineda, J.
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Ward-Thompson, D ...
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Tafalla, M.
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Marcelino, N.
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Malinen, J.
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Friesen, R.
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Giuliano, B. M.
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Agundez, M.
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Hacar, A.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Inorganic Chemis ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Chemical Science ...
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and Theoretical Chem ...
- Articles in the publication
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Astronomy and As ...
- By the university
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Chalmers University of Technology