Abstract
IF the interstellar grains consist of material resembling a semiconductor with a d.c. conductivity σ in the range 0.01 to 10 Ω−1 cm−1, then there may be large optical depths for millimetre and submillimetre waves due to grains. Thus dense clouds or condensations within them may be significant blackbody radiators at these wavelengths because of the grains. Because the grains may have amorphous but not glassy structure, or contain impurities and lattice defects even if the structure should be well ordered, such conductivities for the grains are highly probable1,2.
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LITVAK, M. Millimetre Wave Emission by Interstellar Dust. Nature 223, 1143–1144 (1969). https://doi.org/10.1038/2231143a0
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DOI: https://doi.org/10.1038/2231143a0
