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Sökning: onr:"swepub:oai:research.chalmers.se:fcf1979a-37a7-407c-a502-fd628d749123" > Odin observations o...

  • Bjerkeli, Per,1977Chalmers tekniska högskola,Chalmers University of Technology (författare)

Odin observations of water in molecular outflows and shocks

  • Artikel/kapitelEngelska2009

Förlag, utgivningsår, omfång ...

  • 2009-10-08
  • EDP Sciences,2009

Nummerbeteckningar

  • LIBRIS-ID:oai:research.chalmers.se:fcf1979a-37a7-407c-a502-fd628d749123
  • https://research.chalmers.se/publication/104914URI
  • https://doi.org/10.1051/0004-6361/200912064DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-31887URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:art swepub-publicationtype
  • Ämneskategori:ref swepub-contenttype

Anmärkningar

  • Aims: We investigate the ortho-water abundance in outflows and shocks in order to improve our knowledge of shock chemistry and of the physics behind molecular outflows.Methods: We used the Odin space observatory to observe the H2O(110-101) line. We obtain strip maps and single pointings of 13 outflows and two supernova remnants where we report detections for eight sources. We used RADEX to compute the beam averaged abundances of o-H2O relative to H2. In the case of non-detection, we derive upper limits on the abundance.Results: Observations of CO emission from the literature show that the volume density of H2 can vary to a large extent, a parameter that puts severe uncertainties on the derived abundances. Our analysis shows a wide range of abundances reflecting the degree to which shock chemistry affects the formation and destruction of water. We also compare our results with recent results from the SWAS team.Conclusions: Elevated abundances of ortho-water are found in several sources. The abundance reaches values as high as what would be expected from a theoretical C-type shock where all oxygen, not in the form of CO, is converted to water. However, the high abundances we derive could also be due to the low densities (derived from CO observations) that we assume. The water emission may in reality stem from high density regions much smaller than the Odin beam. We do not find any relationship between the abundance and the mass loss rate. On the other hand, there is a relation between the derived water abundance and the observed maximum outflow velocity.Odin is a Swedish-led satellite project funded jointly by the Swedish National Space Board (SNSB), the Canadian Space Agency (CSA), the National Technology Agency of Finland (Tekes) and Centre National d'Étude Spatiale (CNES).The Swedish ESO Submillimetre Telescope (SEST) located at La Silla, Chile was funded by the Swedish Research Council (VR) and the European Southern Observatory. It was decommissioned in 2003. Appendix B is only available in electronic form at http://www.aanda.org

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Liseau, René,1949Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)liseau (författare)
  • Olberg, Michael,1956Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)olberg (författare)
  • Falgarone, E.Ecole Normale Superieure (ENS) (författare)
  • Frisk, U.Swedish Space Corporation (SSC) (författare)
  • Hjalmarson, Åke,1939Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)akehjalm (författare)
  • Klotz, A.Université de Toulouse,University of Toulouse (författare)
  • Larsson, Bengt,1943Stockholms universitet,Institutionen för astronomi,Stockholm Observatory(Swepub:cth)bl (författare)
  • Olofsson, Henrik,1972Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)henolo (författare)
  • Olofsson, G.Stockholms universitet,Institutionen för astronomi,Stockholm Observatory (författare)
  • Ristorcelli, I. (författare)
  • Sandqvist, Aa. (författare)
  • Sandqvist, AageStockholms universitet,Institutionen för astronomi,Stockholm Observatory (författare)
  • Chalmers tekniska högskolaEcole Normale Superieure (ENS) (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Astronomy and Astrophysics: EDP Sciences507:3, s. 1455-14660004-63611432-0746

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