SWS observations of solid CO2 in molecular clouds
Th. de Graauw
- D.C.B. Whittet
- P.A. Gerakines
- O.H. Bauer
- D.A. Beintema
- A.C.A. Boogert
- D.R. Boxhoorn
- J.E. Chiar
- P. Ehrenfreund
- H. Feuchtgruber
- F.P. Helmich
- A.M. Heras
- R. Huygen
- D.J.M. Kester
- D. Kunze
- F. Lahuis
- K.J. Leech
- D. Lutz
- P.W. Morris
- T. Prusti
- P.R. Roelfsema
- A. Salama
- S.G. Schaeidt
- W.A. Schutte
- H.W.W. Spoon
- A.G.G.M. Tielens
- E.A. Valentijn
- B. Vandenbusshe
- E.F. van Dishoeck
- P.R. Wesselius
- E. Wieprecht
- C.M. Wright
Abstract:
We report absorption features of solid CO 
stretching
and bending modes in several lines of sight, including
embedded young stellar objects and the Galactic Center
source Sgr A*. The overall CO abundance in ices is
15% relative to HO.
Profile shapes are consistent with the presence of grain mantles
with distinct polar ( HO -rich) and nonpolar (CO or
CO -rich) layers. In addition to the
normal isotopic form, we report detection of the stretching
mode of 13CO ; the 12C/13C ratio is consistent
with terrestrial and interstellar values.
Keywords:
ISM: molecules - dust, extinction -
Infrared: interstellar: lines -
Stars: pre-main sequence - Galaxy: center
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