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Herschel-HIFI observations of H2O in high-mass star-forming regions: first results

Published online by Cambridge University Press:  25 November 2011

M. Röllig ,
R. Simon ,
V. Ossenkopf ,
J. Stutzki ,
F. van der Tak ,
F. Herpin  and
F. Wyrowski
F. van der Tak
Affiliation:
SRON Netherlands Institute for Space Research, Landleven 12, 9747 AD Groningen, The Netherlands
F. Herpin
Affiliation:
Université de Bordeaux, Laboratoire d’Astrophysique, CNRS/INSU, UMR 5804, Floirac, France
F. Wyrowski
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
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Abstract

This paper reviews the first results of observations of H2O line emission with Herschel-HIFI towards high-mass star-forming regions, obtained within the WISH guaranteed time program. The data reveal three kinds of gas-phase H2O: “cloud water” in cold tenuous foreground clouds, “envelope water” in dense protostellar envelopes, and “outflow water” in protostellar outflows. The low H2O abundance (10-10−10-9) in foreground clouds and protostellar envelopes is due to rapid photodissociation and freeze-out on dust grains, respectively. The outflows show higher H2O abundances (10-7−10-6) due to grain mantle evaporation and (probably) neutral-neutral reactions.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 52: Conditions and Impact of Star Formation , 2011 , pp. 201 - 204
Copyright
© EAS, EDP Sciences 2011

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References

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