Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...199..398h&link_type=abstract
Astrophysical Journal, vol. 199, July 15, 1975, pt. 1, p. 398-400.
Astronomy and Astrophysics
Astronomy
9
Cosmic Dust, Electromagnetic Absorption, Far Infrared Radiation, Infrared Astronomy, Interstellar Matter, Nebulae, Cloud Physics, Density Distribution, Interstellar Extinction, Radiative Transfer, Stimulated Emission, Temperature Effects
Scientific paper
The observed absorption of far-infrared radiation by an interstellar dust cloud is a complicated function of the material properties of grains, of their column density, and of the extent of stimulated emission. At long wavelengths, neglect of stimulated emission would lead to an underestimate of the amount of absorbing material observed along a line of sight. However, if the complex index of refraction for grains is measured at the low temperatures in question, a classical analysis will be correct since the measured refractive index correctly accounts for stimulated emission. Since the grain temperatures may strongly affect the refractive index of a grain, typical interstellar grain temperature fluctuations are analyzed in a final section.
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