Other
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223..405b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Vol. 223, NO.2/NOV15, P. 405, 1986
Other
18
Scientific paper
A galactochemical model of dense molecular clouds based on 1103 gas-phase reactions involving 99 species containing H, He, C, N, 0, Na, Mg and Fe is described. It is a development of previous schemes such as that of Prasad & Huntress but includes many revised values of reaction cross-sections. In particular it includes the recently measured H3+ recombination rate (Smith & Adams 1984). A sensitivity analysis reveals the way in which predicted abundances depend upon the assumed initial cloud conditions and the model parameters. It is shown that observations of abundances of small molecules in the molecular clouds TMC-1, Ori A and Sgr B2 can be very satisfactorily accounted for if we accept that TMC-1 is an old cloud (≍ 106 - 107 yr) and Ori A is young (≍ 105 yr). No unusual or extreme assumptions about initial conditions or model parameters are required. The good agreement is evidence that there is substantial metal depletion in molecular clouds. Since the purely gas-phase model is so satisfactory in accounting for abundances it is not necessary to invoke any molecule production via grain surfaces other than H2 formation.
Brown David R.
Rice H. N. E.
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