Abstract
ABSTRACT. Since the first observations, the continuum of active galactic nuclei have been represented by a power law (F ). Recently, infrared and ultraviolet observations lead to the of thermal com ponents at these ranges. The Seyfert 2 galaxies show an ultraviolet excess at 10 -2O associated to thermal emission by heated dust (Neugebauer 1978, hq , 17, 149; Neugebauer, Becklin, Oke, and Searle, 1976, Ap. J., 205, 29). The extrapolation of the optical law does not provide enough ioni zing photons neither the necessary ultraviolet luminosity that explains dust heating. In this paper, we analyze the contribution of an ultraviolet accretion disk component (Malkan and Sargent 1982, Ap. J., 254, 22 (Paper I); 1983, Ap. 5., 268, 582) added to the non thermal continuum explaining the observational values of H luminosity, the intensity ratio ( /H ) and the infrared luminosity associated to thermal emission of dust grains heated by the central source. oit : GALAXIES-ACTIVE
