Other
Scientific paper
Nov 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.291..455c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 2911, p. 455
Other
39
Interstellar Gas, Molecular Clouds, Interstellar Chemistry, Cosmic Dust, Gas Density, Astronomical Models, Binding Energy, Carbon Monoxide, Oxygen, Nitrogen
Scientific paper
The chemistry arising from the exchange of molecules between dust and gas in ultradense cool cores is described. Under certain assumptions concerning molecule-grain binding energies and dust temperature, slight warming of cold dust grains can induce selective desorption of mantle volatiles. It is theoretically possible for ultradense cores to become depleted in CO but to remain abundant in N2 and so be relatively rich in nitrogen-bearing molecules. This effect may explain the apparent depletion of CO and the presence of ammonia in several cores within the NGC 2024 cloud. The theory implies that heavy metal atoms should be almost entirely absent from the gas phase of high-density cores, and that a mantle of CO, O2, N2 and other weakly bound molecules should cover water ice mantles, forming a 'volatile crust'. Molecular observations are suggested which will allow a test of this model.
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