Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh51d0297b&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #SH51D-0297
Astronomy and Astrophysics
Astronomy
2104 Cosmic Rays
Scientific paper
Interstellar and interplanetary dust plays a key role in the evolution of the Interstellar Medium (ISM) in galaxies and the formation of stars, planets and possibly life. The dust composition is determined by physical processes, including ion bombardment. We have irradiated forsterite single crystals dust analogs with swift heavy ions with a large electronic energy deposition. Amorphization of the crystals was monitored with Rutherford Back-Scattering (RBS) and verified by transmission electron microscopy (TEM) observations. Modeling of ion tracks also shows a similar behavior. IR spectra of the irradiated samples agree well with observed astronomical spectra. Based on this evidence, and taking into account accepted ion fluxes we can predict that silicate grains can be amorphized by heavy cosmic rays.
Bajt Saa
Baragiola Raúl A.
Bradley Jeremy
Breugel Wil van
Bringa Eduardo M.
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