Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....48..395l&link_type=abstract
Astronomy and Astrophysics, vol. 48, no. 3, May 1976, p. 395-403.
Astronomy and Astrophysics
Astrophysics
23
Carbon Monoxide, Interstellar Matter, Ionic Reactions, Molecular Gases, Abundance, Interstellar Gas, Reaction Kinetics, Steady State, Time Dependence
Scientific paper
Analytical solutions are obtained for nonlinear differential equations governing the time-dependence of molecular abundances in interstellar clouds. Three gas-phase reaction schemes are considered separately for the regions where each dominates. The particular case of CO, and closely related members of the Oh and CH families of molecules, is studied for given values of temperature, density, and the radiation field. Nonlinear effects and couplings with particular ions are found to be important. The time scales for CO formation range from 100,000 to a few million years, depending on the chemistry and regime. The time required for essentially complete conversion of C(+) to CO in the region where the H3(+) chemistry dominates is several million years. Because this time is longer than or comparable to dynamical time scales for dense interstellar clouds, steady-state abundances may not be observed in such clouds.
Glassgold Alfred E.
Langer William D.
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