SWS observations of solid CO_2_ in molecular clouds.

Details SWS observations of solid CO_2_ in molecular clouds. SWS observations of solid CO_2_ in molecular clouds.

Nov 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...315l.345d&link_type=abstract

Astronomy and Astrophysics, v.315, p.L345-L348

Astronomy and Astrophysics

Astrophysics

114

Ism: Molecules, Dust, Extinction, Infrared: Interstellar: Lines, Stars: Pre-Main Sequence, Galaxy: Center

Scientific paper

We report absorption features of solid CO_2_ stretching and bending modes in several lines of sight, including embedded young stellar objects and the Galactic Center source Sgr A*. The overall CO_2_ abundance in ices is ~15% relative to H_2_O. Profile shapes are consistent with the presence of grain mantles with distinct polar (H_2_O-rich) and nonpolar (CO or CO_2_-rich) layers. In addition to the normal isotopic form, we report detection of the stretching mode of ^13^CO_2_; the ^12^C/^13^C ratio is consistent with terrestrial and interstellar values.

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