Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-13
2004, ASP Connference Series 309, 709
Astronomy and Astrophysics
Astrophysics
19 pages, 10 figures, invited paper in Astrophysics of Dust, (eds.) A.N. Witt, B.T. Draine & G.C. Clayton, ASP Conference Seri
Scientific paper
Dust particles in space may appear as clusters of individual grains. The morphology of these clusters could be of a fractal or more compact nature. To investigate how the cluster morphology influences the calculated extinction of different clusters in the wavelength range 0.1 - 100 micron, we have preformed extinction calculations of three-dimensional clusters consisting of identical touching spherical particles arranged in three different geometries: prefractal, simple cubic and face-centered cubic. In our calculations we find that the extinction of prefractal and compact clusters are of the same order of magnitude. For the calculations, we have performed an in-depth comparison of the theoretical predictions of extinction coefficients of multi-sphere clusters derived by rigorous solutions, on the one hand, and popular discrete-dipole approximations, on the other. This comparison is essential if one is to assess the degree of reliability of model calculations made with the discrete-dipole approximations, which appear in the literature quite frequently without an adequate accounting of their validity.
Andersen Anja C.
Niklasson Gunnar A.
Pustovit Vitaliy N.
Sotelo J. A.
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