On cosmic ray processing of ices in molecular clouds

Details On cosmic ray processing of ices in molecular clouds On cosmic ray processing of ices in molecular clouds

Nov 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010vaoa.conf...70y&link_type=abstract

"Evolution of Cosmic Objects through their Physical Activity, Proceedings of the Conference dedicated to Viktor Ambartsumian's 1

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Cosmic Rays, Ionization Of H2, Molecular Clouds, Irradiation Doses Of Ices

Scientific paper

We investigated theoretically the transformation of the energy dependence of the cosmic ray proton flux in the keV to GeV region when penetrating inside molecular clouds. Our computations suggest that energy losses of the cosmic ray particles by interaction with the matter of the molecular cloud are principally caused by the inelastic (electronic) interaction potential; the transformed energy distribution of energetic protons is determined mainly by the column density of the absorbing medium. Up to now there are no detailed investigations on an energetic particle processing of various ices by ions, modeling the cosmic ray irradiation over the whole energy range from eV to GeV. Our studies on the ion induced conversion of ices include an examination of the linear energy transfer due to stopping processes, by which the input projectile loses its original energy to particles in the target. In particular, a cosmic ray irradiation dose up to AV = 50 for icy methane is calculated and discussed. The results can be used to predict a radiation induced chemical conversion rate of simple chemical species to complex ones by means of forthcoming experimental data.

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