On C(o) and CO in dense interstellar clouds - Evidence that cloud material is frequently shocked

Details On C(o) and CO in dense interstellar clouds - Evidence that cloud material is frequently shocked On C(o) and CO in dense interstellar clouds - Evidence that cloud material is frequently shocked

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.210..141w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 210, Sept. 1, 1984, p. 141-145.

Astronomy and Astrophysics

Astronomy

54

Astronomical Models, Carbon, Carbon Monoxide, Interstellar Matter, Molecular Clouds, Shock Waves, Interstellar Chemistry, Low Speed

Scientific paper

The high C:CO ratio observed in a variety of objects, together with the low fractional abundance of molecules observed in some quiescent dark clouds and the process limiting the accretion of molecules onto grains, are addressed by a model in which low velocity shocks in molecular clouds periodically return grain mantle material to the gas. The possible origin of such shocks is considered, and it is shown that they could be responsible for keeping the entire chemistry out of equilibrium as well as for preventing the total depletion of elements in dense clouds by mantle accretion on grains.

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