Volume 381, Number 2, JanuaryII 2002
|Page(s)||560 - 565|
|Published online||15 January 2002|
CHDCCH along the TMC-1 ridge
Department of Physics, UMIST, PO Box 88, Manchester M60 1QD, UK e-mail: Tom.Millar@umist.ac.uk
2 Space Science Division, NASA Ames Research Center, MS 245-3, Moffett Field, CA 94035, USA e-mail: email@example.com
Corresponding author: A. J. Markwick, firstname.lastname@example.org
Accepted: 2 October 2001
In this paper we present measurements of the ratio along the TMC-1 ridge. The level of deuterium fractionation in this molecule is found to be larger than previously thought, but more significantly, the fractionation increases as one moves from the cyanopolyyne peak to the ammonia peak, as is the case with measurements of other molecules in TMC-1. This confirms the prediction of our recent chemical/dynamical model of TMC-1 and supports the hypothesis that the chemical evolution of TMC-1 has been affected by Alfvén waves.
Key words: MHD: waves / ISM: abundances / ISM: molecules / ISM: individual (Taurus Molecular Cloud) / molecular processes
© ESO, 2002
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