The optical and UV spectrum of the Seyfert type 2 galaxy NGC 3393.

Abstract

The combined UV and optical spectrum of the Seyfert type 2 galaxy NGC 3393 is presented and analyzed together with published IR and IRAS data. The conditions in the narrow line gas strongly suggest that the high ionization material is in a zone of higher density (N_e_=10^5^ cm^-3^) while the low ionization material is at N_e_=10^3^ cm^-3^. No evidence is found for internal reddening. Most of the optical and near IR flux is of stellar origin and the IRAS fluxes can be adequately described by dust emission with two components at temperatures of about 30K and 130K respectively. This dust would probably be located in the regions surrounding the Seyfert nucleus. The flux distribution of the nonstellar component can be fitted by a power-law of the form F_nu_ is proportional to ν^alpha^ with α=-0.60. This power-law is closer to that observed in quasars and Seyfert type 1 galaxies than to that commonly derived for Seyfert types 2 (α=-1.5).