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  • Fuente, A.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)

Gas phase Elemental abundances in Molecular cloudS (GEMS) I. The prototypical dark cloud TMC 1

  • Article/chapterEnglish2019

Publisher, publication year, extent ...

  • 2019-04-19
  • EDP Sciences,2019
  • electronicrdacarrier

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:054928d1-d7f7-41ce-b74d-d00ab6021f45
  • https://doi.org/10.1051/0004-6361/201834654DOI
  • https://research.chalmers.se/publication/510022URI
  • https://research.chalmers.se/publication/510112URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • GEMS is an IRAM 30 m Large Program whose aim is determining the elemental depletions and the ionization fraction in a set of prototypical star-forming regions. This paper presents the first results from the prototypical dark cloud Taurus molecular cloud (TMC) 1. Extensive millimeter observations have been carried out with the IRAM 30 m telescope (3 and 2mm) and the 40 m Yebes telescope (1.3 cm and 7 mm) to determine the fractional abundances of CO, HCO+, HCN, CS, SO, HCS+, and N2H+ in three cuts which intersect the dense filament at the well-known positions TMC 1-CP, TMC 1-NH3, and TMC 1-C, covering a visual extinction range from A(v) similar to 3 to similar to 20 mag. Two phases with differentiated chemistry can be distinguished: (i) the translucent envelope with molecular hydrogen densities of 1-5 x 10(3) cm(-3); and (ii) the dense phase, located at A(v) > 10 mag, with molecular hydrogen densities >10(4) cm(-3). Observations and modeling show that the gas phase abundances of C and O progressively decrease along the C+/C/CO transition zone (A(v) similar to 3 mag) where C/H similar to 8 x 10(-5) and C/O similar to 0.8-1, until the beginning of the dense phase at A(v) similar to 10 mag. This is consistent with the grain temperatures being below the CO evaporation temperature in this region. In the case of sulfur, a strong depletion should occur before the translucent phase where we estimate an S/H similar to (0.4-2.2) x 10(-6), an abundance similar to 7-40 times lower than the solar value. A second strong depletion must be present during the formation of the thick icy mantles to achieve the values of S/H measured in the dense cold cores (S/H similar to 8 x 10(-8)). Based on our chemical modeling, we constrain the value of zeta(H2) to similar to(0.5-1.8) x 10(-16) s(-1) in the translucent cloud.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Navarro, D. G.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
  • Caselli, P.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Gerin, M.Observatoire de Paris,Paris Observatory (author)
  • Kramer, C.Institut de Radioastronomie Millimétrique (IRAM) (author)
  • Roueff, E.PSL University Paris (author)
  • Alonso-Albi, T.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
  • Bachiller, R.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
  • Cazaux, S.Universiteit Leiden (UL),Leiden University (UL),Technische Universiteit Delft,Delft University of Technology (TU Delft) (author)
  • Commercon, B.Université de Lyon (author)
  • Friesen, R.National Radio Astronomy Observatory (author)
  • Garcia-Burillo, S.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
  • Giuliano, B. M.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Goicoechea, J. R.Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council (author)
  • Gratier, P.Université de Bordeaux,University of Bordeaux (author)
  • Hacar, A.Universiteit Leiden (UL),Leiden University (UL) (author)
  • Jimenez-Serra, I (author)
  • Kirk, J.The University of Warwick (author)
  • Lattanzi, VMax Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Loison, J. C.Université de Bordeaux,University of Bordeaux (author)
  • Malinen, J.Helsingin Yliopisto,University of Helsinki,Universität zu Köln,University of Cologne (author)
  • Marcelino, N.Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council (author)
  • Martin-Domenech, R.Harvard-Smithsonian Center for Astrophysics (author)
  • Munoz-Caro, G. (author)
  • Pineda, J.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
  • Tafalla, M.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
  • Tercero, B.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
  • Ward-Thompson, D.University of Central Lancashire (author)
  • Treviño Morales, Sandra,1985Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)trevino (author)
  • Riviere-Marichalar, P.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
  • Roncero, O.Agencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council (author)
  • Vidal, T.Université de Bordeaux,University of Bordeaux (author)
  • Ballester, M. Y.Universidade Federal de Juiz de Fora,Federal University of Juiz de Fora (author)
  • Observatorio Astronómico Nacional (OAN)Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG) (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics: EDP Sciences6240004-63611432-0746

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