New models of interstellar gas-grain chemistry - III. Solid CO2

Details New models of interstellar gas-grain chemistry - III. Solid CO2 New models of interstellar gas-grain chemistry - III. Solid CO2

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001mnras.324.1054r&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 324, Issue 4, pp. 1054-1062.

Astronomy and Astrophysics

Astronomy

43

Molecular Processes, Stars: Formation, Ism: Abundances, Ism: Clouds, Ism: Molecules

Scientific paper

Solid CO2 is observed to be an abundant interstellar ice component towards both quiescent clouds and active star-forming regions. Our recent models of gas-grain chemistry, appropriate for quiescent regions, severely underproduce solid CO2 at the single assumed gas density and temperature. In this paper, we investigate the sensitivity of our model results to changes in these parameters. In addition, we examine how the nature of the grain surface affects the results and also consider the role of the key surface reaction between O and CO. We conclude that the observed high abundance of solid CO2 can be reproduced at reasonable temperatures and densities by models with diffusive surface chemistry, provided that the diffusion of heavy species such as O occurs efficiently.

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