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2011•Astronomy and AstrophysicsOpen access

Ion irradiation of carbonaceous interstellar analogues

Marie Godard, Géraldine Féraud, M. Chabot, Yvain Carpentier, Thomas Pino, R. Brunetto, Jean Duprat, C. Engrand, Ph. Bréchignac, Louis Le Sergeant d’Hendecourt, Emmanuel Dartois

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Abstract

Context. A 3.4 μm absorption band (around 2900 cm-1), assigned to aliphatic C-H stretching modes of hydrogenated amorphous carbons (a-C:H), is widely observed in the diffuse interstellar medium, but disappears or is modified in dense clouds. This spectral difference between different phases of the interstellar medium reflects the processing of dust in different environments. Cosmic ray bombardment is one of the interstellar processes that make carbonaceous dust evolve.

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Context. A 3.4 μm absorption band (around 2900 cm-1), assigned to aliphatic C-H stretching modes of hydrogenated amorphous carbons (a-C:H), is widely observed in the diffuse interstellar medium, but disappears or is modified in dense clouds. This spectral difference between different phases of the interstellar medium reflects the processing of dust in different environments. Cosmic ray bombardment is one of the interstellar processes that make carbonaceous dust evolve.

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Available abstract

Context. A 3.4 μm absorption band (around 2900 cm-1), assigned to aliphatic C-H stretching modes of hydrogenated amorphous carbons (a-C:H), is widely observed in the diffuse interstellar medium, but disappears or is modified in dense clouds. This spectral difference between different phases of the interstellar medium reflects the processing of dust in different environments. Cosmic ray bombardment is one of the interstellar processes that make carbonaceous dust evolve.

Key concepts: Physics, Interstellar medium, Astrochemistry, Interstellar cloud, Interstellar ice, Astrophysics, Context (archaeology), Ion

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