Dynamical mixing in molecular clouds

Details Dynamical mixing in molecular clouds Dynamical mixing in molecular clouds

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...221...89c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 221, no. 1, Aug. 1989, p. 89-94.

Astronomy and Astrophysics

Astrophysics

65

Dynamic Characteristics, Gas Flow, Interstellar Matter, Molecular Clouds, Turbulent Mixing, Carbon, Gravitational Collapse, Mass Distribution, Star Formation, Steady State

Scientific paper

The results of chemical equilibrium calculations are often difficult to reconcile with observations. For example, large abundances of neutral carbon have been observed deep in the interiors of molecular clouds. The turbulence observed in these clouds suggests the possibility of mass exchanges between regions of a cloud with different densities and depths. Calculations are made of the steady state chemical abundances in a gas flow cycling between the physical conditions found respectively in dense cores and their envelopes, as a function of the characteristic times of the flow. The main result of this study is that large, steady state, abundances of C and of 'complex molecules' are obtained along with a significant depletion of H2O and O2, provided that the characteristic time of the gas turn-over in dense cores is of the order of the local free-fall time. A model is presented which suggests that both the chemical mixing and the mass distribution in a cloud as a function of the density may be the result of the partial gravitational collapse of clumps followed by relaxation.

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