SED fitting of nearby galaxies in the Herschel Reference Survey

We compute UV to radio continuum spectral energy distributionsof 51 nearby galaxies recently observed with SPIREonboard Herschel and present infrared colours (in the 25-500 μm spectral range). SPIREdata of normal galaxies are well reproduced with a modified black body(β=2) of temperature T≃q 20 K. In ellipticals hosting a radio galaxy, the far-infrared(FIR) emission is dominated by the synchrotron nuclear emission. The colour temperature of the cold dust is higher in quiescent E-S0a than in star-forming systems probably because of the different nature of their dust heating sources (evolved stellar populations, X-ray, fast electrons) and dust grain properties.