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Gas phase Elemental...
Gas phase Elemental abundances in Molecular cloudS (GEMS): II. On the quest for the sulphur reservoir in molecular clouds: the H2S case
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- Navarro-Almaida, D. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Le Gal, R. (författare)
- Harvard-Smithsonian Center for Astrophysics
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- Fuente, A. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Riviere-Marichalar, P. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Wakelam, V (författare)
- Université de Bordeaux,University of Bordeaux
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- Cazaux, S. (författare)
- Universiteit Leiden (UL),Leiden University (UL),Technische Universiteit Delft,Delft University of Technology (TU Delft)
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- Caselli, P. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Laas, J. C. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Alonso-Albi, T. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Loison, J. C. (författare)
- Université de Bordeaux,University of Bordeaux
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- Gerin, M. (författare)
- PSL University Paris
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- Kramer, C. (författare)
- Institut de Radioastronomie Millimétrique (IRAM)
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- Roueff, E. (författare)
- Sorbonne Université,Sorbonne University
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- Bachillerl, R. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Commercon, B. (författare)
- Université de Lyon
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- Friesen, R. (författare)
- National Radio Astronomy Observatory
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- Garcia-Burillo, S. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Goicoechea, J. R. (författare)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Giuliano, B. M. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Jimenez-Serram, I (författare)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Kirk, J. M. (författare)
- University of Central Lancashire
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- Lattanzi, V (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Malinen, J. (författare)
- Helsingin Yliopisto,University of Helsinki,Universität zu Köln,University of Cologne
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- Marcelino, N. (författare)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Martin-Domenech, R. (författare)
- Harvard-Smithsonian Center for Astrophysics
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- Caro, G. M. Munoz (författare)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Pineda, J. (författare)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Tercero, B. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Treviño Morales, Sandra, 1985 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Roncero, O. (författare)
- Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
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- Hacar, A. (författare)
- Universiteit Leiden (UL),Leiden University (UL)
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- Tafalla, M. (författare)
- Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)
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- Ward-Thompson, D. (författare)
- University of Central Lancashire
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(creator_code:org_t)
- 2020-05-12
- 2020
- Engelska.
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Ingår i: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 637
- Relaterad länk:
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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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https://research.cha...
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Abstract
Ämnesord
Stäng
- Context. Sulphur is one of the most abundant elements in the Universe. Surprisingly, sulphuretted molecules are not as abundant as expected in the interstellar medium and the identity of the main sulphur reservoir is still an open question. Aims. Our goal is to investigate the H2S chemistry in dark clouds, as this stable molecule is a potential sulphur reservoir. Methods. Using millimeter observations of CS, SO, H2S, and their isotopologues, we determine the physical conditions and H2S abundances along the cores TMC 1-C, TMC 1-CP, and Barnard 1b. The gas-grain model NAUTILUS is used to model the sulphur chemistry and explore the impact of photo-desorption and chemical desorption on the H2S abundance. Results. Our modeling shows that chemical desorption is the main source of gas-phase H2S in dark cores. The measured H2S abundance can only be fitted if we assume that the chemical desorption rate decreases by more than a factor of 10 when n(H) > 2 x 10(4). This change in the desorption rate is consistent with the formation of thick H2O and CO ice mantles on grain surfaces. The observed SO and H2S abundances are in good agreement with our predictions adopting an undepleted value of the sulphur abundance. However, the CS abundance is overestimated by a factor of 5-10. Along the three cores, atomic S is predicted to be the main sulphur reservoir. Conclusions. The gaseous H2S abundance is well reproduced, assuming undepleted sulphur abundance and chemical desorption as the main source of H2S. The behavior of the observed H2S abundance suggests a changing desorption efficiency, which would probe the snowline in these cold cores. Our model, however, highly overestimates the observed gas-phase CS abundance. Given the uncertainty in the sulphur chemistry, we can only conclude that our data are consistent with a cosmic elemental S abundance with an uncertainty of a factor of 10.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- ISM: molecules
- ISM: kinematics and dynamics
- stars: low-mass
- ISM: abundances
- astrochemistry
- stars: formation
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- art (ämneskategori)
- ref (ämneskategori)
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Till lärosätets databas
- Av författaren/redakt...
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Navarro-Almaida, ...
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Le Gal, R.
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Fuente, A.
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Riviere-Marichal ...
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Wakelam, V
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Cazaux, S.
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visa fler...
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Caselli, P.
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Laas, J. C.
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Alonso-Albi, T.
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Loison, J. C.
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Gerin, M.
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Kramer, C.
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Roueff, E.
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Bachillerl, R.
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Commercon, B.
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Friesen, R.
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Garcia-Burillo, ...
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Goicoechea, J. R ...
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Giuliano, B. M.
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Jimenez-Serram, ...
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Kirk, J. M.
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Lattanzi, V
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Malinen, J.
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Marcelino, N.
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Martin-Domenech, ...
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Caro, G. M. Muno ...
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Pineda, J.
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Tercero, B.
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Treviño Morales, ...
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Roncero, O.
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Hacar, A.
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Tafalla, M.
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Ward-Thompson, D ...
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Chalmers tekniska högskola