Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-01-16
Astrophys.J. 645 (2006) 314-323
Astronomy and Astrophysics
Astrophysics
Accepted for publication in the Astrophysical Journal
Scientific paper
10.1086/502624
We present an analysis of "bistability" in gas-phase chemical models of dark interstellar clouds. We identify the chemical mechanisms that allow high- and low-ionization solutions to the chemical rate-equations to coexist. We derive simple analytic scaling relations for the gas densities and ionization rates for which the chemistry becomes bistable. We explain why bistability is sensitive to the H3+ dissociative recombination rate coefficient, and why it is damped by gas-grain neutralization.
Boger Gai I.
Sternberg Amiel
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