Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...296..797s&link_type=abstract
Astronomy and Astrophysics, v.296, p.797
Astronomy and Astrophysics
Astrophysics
89
Interstellar Medium: Dust
Scientific paper
For particles grown in the two limiting cases of coagulation (particle-cluster agglomeration and cluster-cluster agglomeration), lower and upper limits of the extinction at wavelengths from 1μm to 1mm are derived. The particle sizes are in the Rayleigh limit for the considered wavelength range and the number of constituent grains in each particle is constant. Effective medium theories, the discrete dipole approximation and the discrete multipole method are applied to compute the optical behaviour of the coagulated particles. The spectral representation for inhomogeneous media is employed to investigate topology effects systematically. We found that the extinction limits strongly depend on the used refractive indices and on the topology of the aggregates and that the porosity of the particles is not the most important parameter. For particles composed of amorphous carbon, the enhancement of the extinction with respect to the extinction value for compact spheres of the same mass is between 2 and 1000 at 1mm wavelength. For silicate particles, the enhancement of the extinction is in the range 1.5-3.5 at 1mm wavelength.
Henning Th
Ossenkopf Volker
Stognienko R.
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