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Fractal Dust Grains

Published online by Cambridge University Press:  23 September 2016

Edward L. Wright
Edward L. Wright*
Affiliation:
UCLA Dept. of Astronomy

Abstract

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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 Rayleign 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.

Type
Section V: Optical Propeties of Grains
Information
Symposium - International Astronomical Union , Volume 135: Interstellar Dust , 1989 , pp. 337 - 342
Copyright
Copyright © Kluwer 1989 

References

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