Volume 381, Number 1, JanuaryI 2002
|Page(s)||L33 - L36|
|Published online||15 January 2002|
Letter to the Editor
Possible evidence for shocks in hot cores
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2 Department of Physics & Astronomy, University College London, London WC1E 6BT, UK
Corresponding author: J. Hatchell, firstname.lastname@example.org
Accepted: 12 November 2001
The NS/CS ratio can be used to test if shocks or thermal evaporation remove grain ices during massive star formation. The two scenarios lead to differences in the subsequent chemistry: in particular, timescales are shorter if shocks are present. We have measured NS/CS ratios in six hot core sources through observation of high excitation NS, N34S, C34S and C33S with the JCMT. The NS/CS ratios we find are low, , and surprisingly consistent between sources. Comparing with the models of Viti et al. ([CITE]), these values rule out the standard assumption of instantaneous thermal evaporation, and favour a scenario in which hot cores are shocked at an early stage with all grain mantles evaporating instantaneously.
Key words: stars: formation / molecular processes / ISM: abundances / Hii regions / ISM: molecules
© ESO, 2002
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