Abstract
Dust particles in the interstellar medium are almost certainly not spherical or any other shape which allows an analytical calculation of the extinction curve, even in the Rayleigh limit. Particles in soot and interplanetary dust particles are aggregates formed by subclusters which stick together. This paper uses the discrete dipole approximation (DDA) to compute the absorption and extinction curves for fractal shapes generated by this clustering process. For fractals made from graphite the UV extinction curve shows a bump near the observed 220 nm feature, and a far infrared emission efficiency many times greater than that for spheres.
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References
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© 1989 IAU
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Wright, E.L. (1989). Fractal Dust Grains. In: Allamandola, L.J., Tielens, A.G.G.M. (eds) Interstellar Dust. International Astronomical Union / Union Astronomique Internationale, vol 135. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-2462-8_29
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DOI: https://doi.org/10.1007/978-94-009-2462-8_29
Publisher Name: Springer, Dordrecht
Print ISBN: 978-0-7923-0449-4
Online ISBN: 978-94-009-2462-8
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