Abstract
In a series of two recent papers, the frequency and size distribution dependence of extinction spectra for astronomical silicate and graphite grains was analyzed by us in the context of MRN type interstellar dust models. These grains were taken to be homogeneous spheres following the power law (a−3.5) size distribution which is very much in use. The analytic formulas were obtained for the graphite and silicate grains in wavelength range 1000Å–22,500Å and their utility was demonstrated. In this paper of the series, we present analytic formulas for the scattering and absorption spectrum of another important constituent of interstellar dust models, namely, the polycyclic aromatic hydrocarbons (PAHs). Relative contribution of the PAHs to extinction vis a vis carbonaceous classical grains has been examined.
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