The 10-200 mu m spectral energy distribution of the prototype narrow-line X-ray galaxy NGC 7582

We present the spectral energy distribution (SED) between 10 and 200 mu m o btained for the prototype narrow-line X-ray galaxy NGC 7582 with ISOPHOT, t he photometer on board the Infrared Space Observatory. The emission is spat ially extended and we separated for the first time the nuclear and extranuc lear infrared SEDs. The nuclear luminosity (L-IR similar to 4.5 x 10(10) L. ) is dominated by cold (T similar to 32 K) dust emission mainly due to star formation activity; warm (T 122 K) dust emission is also present and is pr obably related to the active nucleus. In addition to a cold component of 30 K, the extranuclear SED (L-IR similar to 1.7 x 10(10) L.) shows emission b y colder (T similar to 17 K) dust: this very cold component comprises 90% o f the total dust mass of 9.8 x 10(7) M..