Optical Properties of Composite Interstellar Grains: A Morphological Analysis

Details Optical Properties of Composite Interstellar Grains: A Morphological Analysis Optical Properties of Composite Interstellar Grains: A Morphological Analysis

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...615..286i&link_type=abstract

The Astrophysical Journal, Volume 615, Issue 1, pp. 286-299.

Astronomy and Astrophysics

Astronomy

15

Astrochemistry, Ism: Dust, Extinction, Radiative Transfer

Scientific paper

In the framework of the transition matrix approach, we calculate the relevant optical properties of cosmic dust grains of amorphous carbon and astronomical silicates, modeled as aggregates of spherical monomers. Two mechanisms of aggregation were considered, producing clusters with different structure and degree of fluffiness: ballistic particle-cluster aggregation (BPCA) and ballistic cluster-cluster aggregation (BCCA). Our results are very different from those obtained through computational approaches based on effective medium theories and might have major implications both on the modeling procedure and on the dust-mass balance in the interstellar medium.

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