Stratified dust grains in the interstellar medium. III: Infrared cross-sections

We construct a model of interstellar dust in which H-rich amorphous carbon is deposited on silicate substrates in the interstellar medium, and is annealed to form H-poor amorphous carbon. The model grains are stratified spheres composed of hollow silicate cores coated with two carbonaceous layers, t...

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Bibliographic Details
Published in:Journal of quantitative spectroscopy & radiative transfer 2011-07, Vol.112 (11), p.1898-1906
Main Authors: Iati, MA, Cecchi-Pestellini, C, Cacciola, A, Saija, R, Denti, P, Borghese, F
Format: Article
Language:English
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Summary:We construct a model of interstellar dust in which H-rich amorphous carbon is deposited on silicate substrates in the interstellar medium, and is annealed to form H-poor amorphous carbon. The model grains are stratified spheres composed of hollow silicate cores coated with two carbonaceous layers, the inner layer of sp[super]2 carbon and the outer layer of sp[super]3 carbon. Using an accurate method of computing the optical properties of such layered grains, we explore the consequences of varying the core-grain size distribution and the thicknesses of the carbonaceous layers on the resulting infrared extinction. We find a wide dispersion in the curve morphology that reflects the grain size distributions and the chemical composition of dust materials.
ISSN:0022-4073
DOI:10.1016/j.jqsrt.2011.01.021