Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280e..46j&link_type=abstract
The Molecular Universe, Proceedings of the 280th Symposium of the International Astronomical Union held in Toledo, Spain, May 30
Other
Scientific paper
Cosmic dust grains prove their existence by interstellar extinction curves, IR spectra, and elemental depletion patterns. They influence the heating rate of the gas via the photo-electric effect and the formation rate of molecular hydrogen as well as other more complex organic molecules being formed on their surfaces. Dust grains, well mixed with gas, absorb and scatter stellar light and reemit the absorbed energy at infrared and millimeter wavelengths. For the interpretation of these data, the spectral properties of cosmic dust in a broad wavelength range are required. These spectral data can be obtained by measurements of dust analogs prepared in the laboratory. The application of formation techniques that come close to astrophysical formation conditions such as gas-phase condensations and the study of dust processing by energy-rich irradiation are necessary to produce astrophysically realistic cosmic dust analogs. A detailed characterization of the physical and chemical structure of the laboratory produced materials has to precede the measurements of the spectral properties. The qualitative improvement of the spectral data measured in the laboratory including spectroscopic measurements at low temperatures and absorption spectroscopy of aerosol particles helps to improve the interpretation of dust observations in various astrophysical environments and to gain more information on astrophysical processes such as star and planet formation.
Henning Th
Huisken Friedrich
Jäger Cornelia
Mutschke J. H.
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