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We separate the extragalactic radio source population above ~50 uJy intoactive galactic nuclei (AGN) and star-forming sources. The primary method ofour approach is to fit the infrared spectral energy distributions (SEDs),constructed using Spitzer/IRAC and MIPS and Herschel/SPIRE photometry, of 380radio sources in the Extended Chandra Deep Field-South. From the fitted SEDs,we determine the relative AGN and star-forming contributions to their infraredemission. With the inclusion of other AGN diagnostics such as X-ray luminosity,Spitzer/IRAC colours, radio spectral index and the ratio of star-forming totalinfrared flux to k-corrected 1.4 GHz flux density, qIR, we determine whetherthe radio emission in these sources is powered by star formation or by an AGN.The majority of these radio sources (60 per cent) show the signature of an AGNat some wavelength. Of the sources with AGN signatures, 58 per cent are hybridsystems for which the radio emission is being powered by star formation. Thisimplies that radio sources which have likely been selected on their starformation have a high AGN fraction. Below a 1.4 GHz flux density of 1 mJy,along with finding a strong contribution to the source counts from purestar-forming sources, we find that hybrid sources constitute 20-65 per cent ofthe sources. This result suggests that hybrid sources have a significantcontribution, along with sources that do not host a detectable AGN, to theobserved flattening of the source counts at ~1mJy for the extragalactic radiosource population.

HerMES: Disentangling active galactic nuclei and star formation in the radio source population