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

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

2010-12-22

arxiv.org/abs/1012.4943v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

4 pages; to appear in the proceedings of the conference "Conditions and Impact of Star Formation" (Zermatt 2010)

Scientific paper

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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