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Crystalline Silicates |
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| Authors: | Frank Molster Ciska Kemper |
| Institution: | (1) ESTEC/ESA, Keplerlaan 1, 2201 AZ Noordwijk, The Netherlands;(2) Present address: Department of Physics and Astronomy, UCLA, 475 Portola Plaza, Los Angeles, CA, 90095-4705;(3) Department of Astronomy, University of Virginia, P.O. Box 3818, Charlottesville, VA 22903-0818, USA |
| Abstract: | One of the big surprises of the Infrared Space Observatory (ISO) has been discovery of crystalline silicates outside our own Solar system. It was generally assumed before that all cosmic silicates in space were of amorphous structure. Thanks to ISO we know now that crystalline silicates are ubiquitous in the Galaxy (except for the diffuse ISM) and sometimes even in very large quantities (> 50% of the small dust particles). The evolution of the crystalline silicates is still not completely clarified, but the combination of theoretical modeling and observations have already shed light on their life-cycle. The absence of crystalline silicates in the diffuse ISM provides us with information about the dust amorphization rate in the ISM. |
| Keywords: | crystalline silicates infrared astronomy |
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