Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...144..147l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 144, no. 1, March 1985, p. 147-160. Research supported by the University of Ca
Astronomy and Astrophysics
Astrophysics
200
Cosmic Dust, Desorption, Grain Boundaries, Interstellar Matter, Molecular Clouds, Transient Heating, Chemical Explosions, Cosmic Rays, Interstellar Gas, Radiant Flux Density, Specific Heat, X Rays
Scientific paper
Different desorption mechanisms from interstellar grains are considered to resolve the conflict between the observed presence of gaseous species in molecular clouds and their expected depletion onto grains. The physics of desorption is discussed with particular reference to the process of grain heating and the specific heat of the dust material. Impulsive heating by X-rays and cosmic rays is addressed. Spot heating of the grains by cosmic rays and how this can lead to desorption of mantles from very large grains is considered. It is concluded that CO depletion on grains will be small in regions with A(V) less than five from the cloud surface and n(H) less than 10,000, in agreement with observations and in contrast to expectations from pure thermal equilibrium. Even in very dense and obscured regions and in the absence of internal ultraviolet sources, the classical evaporation of CO or N2 and O2-rich mantles by cosmic rays is important.
Jura Michael
Leger Alain
Omont Alain
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