MULTIGRAIN DUST CLOUD MODELS OF STARBURST AND SEYFERT-GALAXIES

We present improved, spherically symmetric, multigrain dust models for the far-infrared emission from starburst galaxies, based on an exact radiative transfer code. The parameters of the models are similar to those of the starburst model of Rowan-Robinson & Crawford, with a total optical depth at 1000 angstrom of tau(UV)=200 (A(V)=40). We also extend these models to the class of ultraluminous compact starburst galaxies, and find that similar models with higher optical depths, up to tau(UV)=500, explain the far-infrared spectra of these galaxies. Spherically symmetric models are also presented for the infrared emission from Seyfert galaxies.