The ice threshold in molecular clouds - A diagnostic of the infrared radiation field

Details The ice threshold in molecular clouds - A diagnostic of the infrared radiation field The ice threshold in molecular clouds - A diagnostic of the infrared radiation field

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.258..599w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 258, no. 3, p. 599-601.

Astronomy and Astrophysics

Astronomy

39

Ice, Infrared Radiation, Interstellar Matter, Molecular Clouds, Absorption Spectra, Carbon Monoxide, Cosmic Dust, Interstellar Extinction, Water

Scientific paper

The threshold extinction at which ice is deposited on dust in molecular clouds is observed to show wide variation from cloud to cloud. The desorption of H2O molecules following absorption at 3 microns is proposed to account for the ice deposition threshold extinction. However, this mechanism is effective only up to H2O monolayer coverage and does not restrict the subsequent ice mantle growth, once started. It is shown that the threshold extinction is a measure of the local infrared radiation field near 3 microns in each cloud.

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