Herschel/HIFI measurements of the ortho/para ratio in water towards Sagittarius B2(M) and W31C

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Lis, D. C.California Institute of Technology (Caltech) (author)

Herschel/HIFI measurements of the ortho/para ratio in water towards Sagittarius B2(M) and W31C

Article/chapterEnglish2010

Publisher, publication year, extent ...

2010-10-01
EDP Sciences,2010
electronicrdacarrier

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LIBRIS-ID:oai:research.chalmers.se:37af5419-8584-41b6-936c-5ad53f36ff60
https://research.chalmers.se/publication/131859URI
https://doi.org/10.1051/0004-6361/201015072DOI

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Language:English
Summary in:English

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SwePubSwePub

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

Notes

We present Herschel/HIFI observations of the fundamental rotational transitions of ortho- and para-H216O and H218O in absorption towards Sagittarius B2(M) and W31C. The ortho/para ratio in water in the foreground clouds on the line of sight towards these bright continuum sources is generally consistent with the statistical high-temperature ratio of 3, within the observational uncertainties. However, somewhat unexpectedly, we derive a low ortho/para ratio of 2.35 +/- 0.35, corresponding to a spin temperature of similar to 27 K, towards Sagittarius B2(M) at velocities of the expanding molecular ring. Water molecules in this region appear to have formed with, or relaxed to, an ortho/para ratio close to the value corresponding to the local temperature of the gas and dust.

Subject headings and genre

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
astronomy
cdms
submillimeter: ISM
absorption
ammonia
ISM: abundances
molecular clouds
astrochemistry
submillimeter
ISM: molecules
molecular processes
oxygen
vapor
cologne database
spectroscopy

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

Phillips, T. G.California Institute of Technology (Caltech) (author)
Goldsmith, P. F. (author)
Neufeld, D. A.Johns Hopkins University (author)
Herbst, E.Ohio State University (author)
Comito, C.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Schilke, P.Universität zu Köln,University of Cologne,Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Muller, HolgerUniversität zu Köln,University of Cologne (author)
Bergin, E. A.University of Michigan (author)
Gerin, M.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
Bell, T. A.California Institute of Technology (Caltech) (author)
Emprechtinger, M.California Institute of Technology (Caltech) (author)
Black, John H,1949Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jblack (author)
Blake, G. A.California Institute of Technology (Caltech) (author)
Boulanger, F.Institut d'Astrophysique Spatiale (author)
Caux, E.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France,Université de Toulouse,University of Toulouse (author)
Ceccarelli, C. (author)
Cernicharo, J.Centro de Astrobiologia (CAB) (author)
Coutens, A.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France,Université de Toulouse,University of Toulouse (author)
Crockett, N. R.University of Michigan (author)
Daniel, F.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France,Centro de Astrobiologia (CAB) (author)
Dartois, E.Institut d'Astrophysique Spatiale (author)
de Luca, M.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
Dubernet, M. L.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France,LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
Encrenaz, P.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
Falgarone, E.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
Geballe, T. R.Gemini Observatory North (author)
Godard, B.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
Giesen, T. F.Universität zu Köln,University of Cologne (author)
Goicoechea, J. R.Centro de Astrobiologia (CAB) (author)
Gry, C. (author)
Gupta, H. (author)
Hennebelle, P.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
Hily-Blant, P. (author)
Kolos, R.Polish Academy of Sciences (author)
Krelowski, J.Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University (author)
Joblin, C.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France,Université de Toulouse,University of Toulouse (author)
Johnstone, D.National Research Council Canada (author)
Kazmierczak, M.Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University (author)
Lord, S. D.California Institute of Technology (Caltech) (author)
Maret, S. (author)
Martin, P. G.Institut canadien d'astrophysique théorique,Canadian Institute for Theoretical Astrophysics (author)
Martin-Pintado, J.Centro de Astrobiologia (CAB) (author)
Melnick, G. J.Harvard-Smithsonian Center for Astrophysics (author)
Menten, K. M.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG) (author)
Monje, Raquel,1979California Institute of Technology (Caltech)(Swepub:cth)em1raque (author)
Mookerjea, B.Tata Institute of Fundamental Research (author)
Morris, P.California Institute of Technology (Caltech) (author)
Murphy, J. A.Maynooth University (author)
Ossenkopf, V.Netherlands Institute for Space Research (SRON),Universität zu Köln,University of Cologne (author)
Pearson, J. C. (author)
Perault, M.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
Persson, Carina,1964Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)carina64 (author)
Plume, R.University of Calgary (author)
Qin, S. L.Universität zu Köln,University of Cologne (author)
Salez, M.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
Schlemmer, S.Universität zu Köln,University of Cologne (author)
Schmidt, M.Polish Academy of Sciences (author)
Sonnentrucker, P.Johns Hopkins University (author)
Stutzki, J.Universität zu Köln,University of Cologne (author)
Teyssier, D.European Space Astronomy Centre (ESAC) (author)
Trappe, N.Maynooth University (author)
van der Tak, F. F. S.Netherlands Institute for Space Research (SRON) (author)
Vastel, C.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France,Université de Toulouse,University of Toulouse (author)
Wang, S.University of Michigan (author)
Yorke, H. W. (author)
Yu, S. (author)
Zmuidzinas, J.California Institute of Technology (Caltech) (author)
Boogert, A.California Institute of Technology (Caltech) (author)
Erickson, N.University of Massachusetts (author)
Karpov, A.California Institute of Technology (Caltech) (author)
Kooi, J.California Institute of Technology (Caltech) (author)
Maiwald, F. W. (author)
Schieder, R.Universität zu Köln,University of Cologne (author)
Zaal, P.Netherlands Institute for Space Research (SRON) (author)
California Institute of Technology (Caltech)Johns Hopkins University (creator_code:org_t)

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In:Astronomy and Astrophysics: EDP Sciences521:1, s. Article Number: L26 -0004-63611432-0746

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By the author/editor: Lis, D. C.; Phillips, T. G.; Goldsmith, P. F.; Neufeld, D. A.; Herbst, E.; Comito, C.; show more...; Schilke, P.; Muller, Holger; Bergin, E. A.; Gerin, M.; Bell, T. A.; Emprechtinger, M ...; Black, John H, 1 ...; Blake, G. A.; Boulanger, F.; Caux, E.; Ceccarelli, C.; Cernicharo, J.; Coutens, A.; Crockett, N. R.; Daniel, F.; Dartois, E.; de Luca, M.; Dubernet, M. L.; Encrenaz, P.; Falgarone, E.; Geballe, T. R.; Godard, B.; Giesen, T. F.; Goicoechea, J. R ...; Gry, C.; Gupta, H.; Hennebelle, P.; Hily-Blant, P.; Kolos, R.; Krelowski, J.; Joblin, C.; Johnstone, D.; Kazmierczak, M.; Lord, S. D.; Maret, S.; Martin, P. G.; Martin-Pintado, ...; Melnick, G. J.; Menten, K. M.; Monje, Raquel, 1 ...; Mookerjea, B.; Morris, P.; Murphy, J. A.; Ossenkopf, V.; Pearson, J. C.; Perault, M.; Persson, Carina, ...; Plume, R.; Qin, S. L.; Salez, M.; Schlemmer, S.; Schmidt, M.; Sonnentrucker, P ...; Stutzki, J.; Teyssier, D.; Trappe, N.; van der Tak, F. ...; Vastel, C.; Wang, S.; Yorke, H. W.; Yu, S.; Zmuidzinas, J.; Boogert, A.; Erickson, N.; Karpov, A.; Kooi, J.; Maiwald, F. W.; Schieder, R.; Zaal, P.; show less...

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