Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....37..257a&link_type=abstract
Astronomy and Astrophysics, vol. 37, no. 2, Dec. 1974, p. 257-262.
Astronomy and Astrophysics
Astrophysics
38
Far Infrared Radiation, Interstellar Matter, Temperature Distribution, Absorptivity, Astronomical Models, Background Radiation, Dynamic Models, Galactic Radiation, Grains, Infrared Spectra, Interstellar Extinction, Mathematical Models, Resonant Frequencies, Temperature Effects, Vibration Damping, Vibrational Spectra
Scientific paper
Probable far-infrared (100 micron) emission properties of cold (10 - 20 K) interstellar particles are discussed. A quadratic law describing the frequency dependence of the absorption coefficient near the 100 micron wavelength is derived, and the elementary theory of optically active vibrations is developed. An approximate expression for the temperature-dependent parameter of resonance damping is derived. The average temperature of the grains is calculated as 24 K by equating the interstellar radiation energy input of a grain with its energy output by IR emission. The intensity of far-infrared galactic background radiation is analyzed, and some arguments pertaining to the chemical composition of interstellar particles are presented.
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