Optical properties of dust aggregates. I - Wavelength dependence

Details Optical properties of dust aggregates. I - Wavelength dependence Optical properties of dust aggregates. I - Wavelength dependence

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...263..423k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 263, no. 1-2, p. 423-432.

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Cosmic Dust, Optical Properties, Absorption Cross Sections, Approximation, Computational Astrophysics, Scattering Cross Sections

Scientific paper

The optical properties of dust aggregates are investigated using the discrete dipole approximation, replacing each constituent particle by a dipole. Two extreme types of dust aggregate whose number of constituent particles is 256, 512, and 1024 respectively are treated in order to show how the optical properties depend on structure and size of the aggregates and on the chemical composition of the constituent particles. Below a critical wavelength, the aggregates are found to behave as dipoles. The behavior of the scattering cross sections around the critical wavelength is a diagnostic for the size of dust aggregates regardless of the chemical composition. The wavelength dependence of the absorption cross sessions is explained in terms of the optical thickness of the aggregates and is reasonably reproduced by a simple formula.

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