BIMODAL DUST EMISSION IN 3 CLASSICAL SEYFERT-GALAXIES - NGC-3227, NGC-4051 AND NGC-4151

Far Infrared observations of the Seyfert galaxies NGC 3227, NGC 4051 a nd NGC 4151 are presented. These are the first data from a complete sa mple of Seyfert galaxies that is being observed by ISO as part of the ISOPHOT guaranteed time. The new ISO data, in combination with the IRA S data, show that the mid to far IR emission in all three objects can be ascribed to two well defined regimes, namely a warm dust emitting r egion which we claim is heated by the emission from the respective act ive nuclei and a second colder emitting region which we attribute to d ust heated in star forming regions.