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Communication Dans Un Congrès Année : 2011

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

Résumé

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 (1e-10 -- 1e-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 (1e-7 -- 1e-6) due to grain mantle evaporation and (probably) neutral-neutral reactions.
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Dates et versions

hal-00553002 , version 1 (06-01-2011)

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Floris van Der Tak, Fabrice Herpin, Friedrich Wyrowski, For The High-Mass Wish Team. Herschel-HIFI observations of H2O in high-mass star-forming regions: first results. Conditions and Impact of Star Formation, 2010, Zermatt, Switzerland. pp.201-204. ⟨hal-00553002⟩

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