Mathematics – Probability
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979ap%26ss..65..155a&link_type=abstract
(Lunar and Planetary Institute, Workshop on Thermodynamics and Kinetics of Dust Formation in the Space Medium, Houston, Tex., Se
Mathematics
Probability
8
Cosmic Dust, Far Infrared Radiation, Interstellar Matter, Temperature Distribution, Ultraviolet Absorption, Amorphous Materials, Emissivity, Probability Distribution Functions, Specific Heat
Scientific paper
Temperature fluctuations in interstellar dust grains caused by absorption of ultraviolet photons are discussed. Temperature probability distributions are presented for various assumptions about the grain specific heat and far-infrared emissivity. Grains smaller than or about 0.01 micron may suffer large temperature fluctuations and would spend most of their time at very low temperatures. The 'equilibrium temperature' is not a good measure for most average temperatures of such grains. It is shown that, although small grains spend only a small fraction of their time at the higher temperatures, the emitted far-infrared spectrum is significantly shifted toward shorter wavelengths than predicted for grains assumed to be at the equilibrium temperature.
Aannestad Per A.
Kenyon Scott. J.
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