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ABSTRACT  We present spectral energy distributions (SEDs) for 68  Herschel  sources detected at 5σ at 250, 350 and 500 μm in the HerMES SWIRE‐Lockman field. We explore whether existing models for starbursts, quiescent star‐forming galaxies and active galactic nucleus dust tori are able to model the full range of SEDs measured with  Herschel . We find that while many galaxies (∼56 per cent) are well fitted with the templates used to fit  IRAS ,  Infrared Space Observatory  ( ISO ) and  Spitzer  sources, for about half the galaxies two new templates are required: quiescent (‘cirrus’) models with colder (10–20 K) dust and a young starburst model with higher optical depth than Arp 220. Predictions of submillimetre fluxes based on model fits to 4.5–24 μm data agree rather poorly with the observed fluxes, but the agreement is better for fits to 4.5–70 μm data.  Herschel  galaxies detected at 500 μm tend to be those with the highest dust masses.

Cold dust and young starbursts: spectral energy distributions of Herschel SPIRE sources from the HerMES survey ★