On the Absorption and Emission Properties of Interstellar Grains

Abstract

Our current understanding of the absorption and emission properties of interstellar grains are reviewed. The constraints placed by the Kramers-Kronig relation on the wavelength-dependence and the maximum allowable quantity of the dust absorption are discussed. Comparisons of the opacities (mass absorption coefficients) derived from interstellar dust models with those directly estimated from observations are presented.

invited talk for "The Spectral Energy Distribution of Gas-Rich Galaxies: Confronting Models with Data" (Heidelberg, Germany; 4--8 October 2004), edited by C.C. Popescu & R.J. Tuffs, AIP Conf. Ser., in press; (11 pages, no figures, no tables)

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