Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...621..817t&link_type=abstract
The Astrophysical Journal, Volume 621, Issue 2, pp. 817-830.
Astronomy and Astrophysics
Astronomy
3
Astrochemistry, Ism: Clouds, Ism: Molecules
Scientific paper
Heavy metals in the gas phase are important in controlling the ionization of a cold dark cloud and hence the chemistry and finally the cloud evolution. Two of us (S. P. and R. C. D.) earlier suggested a fast radiative association mechanism to form MgNC and AlNC in TMC-1. We have conducted a sensitive search with the Green Bank Telescope (GBT) for both species in TMC-1. The upper limit for the fractional abundance of MgNC is 1.2×10-11. We have run detailed models of the chemistry, which include high and low metal content, three values of C/O, and three values of density. The models include the time dependence up to 1×108 yr. Most of the models predict that we should have seen MgNC. We compare the conditions in TMC-1 with those for IRC +10216, in which MgNC and AlNC are both detected. We conclude that in IRC +10216 the chemistry favors a high abundance of both atomic Mg+ and cyanopolyynes, the two reactants that form MgNC, and that these reactants are less favored in TMC-1.
Dunbar Robert C.
Langston Glen
Petrie Simon
Turner Barry E.
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