Water in star-forming regions with <i>Herschel</i> (WISH) II. Evolution of 557 GHz 1₁₀-1₀₁ emission in low-mass protostars

Date

2012-06-01

Author

Kristensen, L. E.
van Dishoeck, E. F.
Bergin, E. A.
Visser, R.
Yıldız, Umut
Jose-Garcia, I. San
Jorgensen, J. K.
Herczeg, G. J.
Johnstone, D.
Wampfler, S. F.
Benz, A. O.
Bruderer, S.
Cabrit, S.
Caselli, P.
Doty, S. D.
Harsono, D.
Herpin, F.
Hogerheijde, M. R.
Karska, A.
van Kempen, T. A.
Liseau, R.
Nisini, B.
Tafalla, M.
van der Tak, F.
Wyrowski, F.

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Context. Water is a key tracer of dynamics and chemistry in low-mass star-forming regions, but spectrally resolved observations have so far been limited in sensitivity and angular resolution, and only data from the brightest low-mass protostars have been published. Aims. The first systematic survey of spectrally resolved water emission in 29 low-mass (L 10 km s(-1)). The water abundance in the outer cold envelope is low, greater than or similar to 10(-10). The different H2O profile components show a clear evolutionary trend: in the younger Class 0 sources the emission is dominated by outflow components originating inside an infalling envelope. When large-scale infall diminishes during the Class I phase, the outflow weakens and H2O emission all but disappears.

URI

https://hdl.handle.net/11511/116006

Collections

Department of Physics, Article