Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss..98..323t&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 98, no. 2, Jan. 1984, p. 323-342.
Astronomy and Astrophysics
Astrophysics
1
Cosmic Dust, Far Infrared Radiation, Infrared Absorption, Interstellar Matter, Coatings, Graphite, Iron, Metals, Particle Size Distribution, Permittivity, Temperature Distribution
Scientific paper
Far-infrared properties of metallic particles are reinvestigated in detail. In the far-infrared region, absorption due to the eddy current generally dominates over that obtained by using the Rayleigh approximation erroneously. The wavelength dependence of the eddy current term is examined carefully and shown to be less steep than that predicted by the Rayleigh approximation for dust grains larger than 100 nm in radius. It also depends more sensitively on the grain size. A wider temperature distribution is expected corresponding to a given size distribution and hence the emission spectrum becomes less steep than the predictions by the Rayleigh approximation. Iron and graphite particles are investigated as typical interstellar metallic grains. Effects of coating of dielectric materials are also examined. Comparisons with experimental results and with observations are discussed.
Kamijo Fumio
Onaka Takashi
Tanabe Tatsuyoshi
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