Possible evidence for shocks in hot cores

Details Possible evidence for shocks in hot cores Possible evidence for shocks in hot cores

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...381l..33h&link_type=abstract

Astronomy and Astrophysics, v.381, p.L33-L36 (2002)

Astronomy and Astrophysics

Astrophysics

15

Stars: Formation, Molecular Processes, Ism: Abundances, Hii Regions, Ism: Molecules

Scientific paper

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, 0.02-0.05, and surprisingly consistent between sources. Comparing with the models of Viti et al. (\cite{vitimodel}), 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.

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