Physics
Scientific paper
Aug 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pcim.conf..363e&link_type=abstract
The Physics and Chemistry of the Interstellar Medium, Proceedings of the 3rd Cologne-Zermatt Symposium, held in Zermatt, Septemb
Physics
Scientific paper
The Infrared Space Observatory ISO, launched in November 1995, has provided extraordinary results concerning the nature of dust particles. ISO allowed new insights into the composition of interstellar ices, thermal processing in the protostellar vicinity and gas-grain chemistry. We present ISO observations of bright star-forming regions obtained with the Short Wavelength Spectrometer (SWS) which showed the ubiquitous presence of abundant CO _2 in space and allowed to derive accurate abundances for several ice species. In comparison with laboratory data we discuss recent results on the nature and origin of CO _2 ice, the role of solid O _2 ice in the interstellar oxygen budget and the distribution of ice types in the interstellar medium. Together with astronomical spectra taken by the ISO satellite we show how these laboratory data are currently used for the identification and abundance determination of interstellar ices. Using the combined information of interstellar gas and dust in comparison with laboratory results and theoretical models allows to determine the line of sight conditions such as gas/grain interactions, temperature and irradiation toward star-forming regions.
Ehrenfreund Pascale
Tielens Alexander G. G. M.
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