| Issue |
EAS Publications Series
Volume 52, 2011
Conditions and Impact of Star Formation
|
|
|---|---|---|
| Page(s) | 201 - 204 | |
| DOI | https://doi.org/10.1051/eas/1152033 | |
| Published online | 25 November 2011 | |
M. Röllig, R. Simon, V. Ossenkopf and J. Stutzki (eds)
EAS Publications Series, 52 (2011) 201-204
Herschel-HIFI observations of H2O in high-mass star-forming regions: first results
1
SRON Netherlands Institute for Space Research,
Landleven 12, 9747 AD
Groningen, The
Netherlands
2
Université de Bordeaux, Laboratoire d’Astrophysique, CNRS/INSU,
UMR 5804, Floirac,
France
3
Max-Planck-Institut für Radioastronomie,
Auf dem Hügel 69, 53121
Bonn,
Germany
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.
© EAS, EDP Sciences 2011