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Understanding the interplay between black-hole accretion and star formation,and how to disentangle the two, is crucial to our understanding of galaxyformation and evolution. To investigate, we use a combination of optical andnear-infrared photometry to select a sample of 74 quasars from the VISTA DeepExtragalactic Observations (VIDEO) Survey, over 1 deg$^2$. The depth of VIDEOallows us to study very low accretion rates and/or lower-mass black holes, and26 per cent of the candidate quasar sample has been spectroscopicallyconfirmed. We use a radio-stacking technique to sample below the nominalflux-density threshold using data from the Very Large Array at 1.4 GHz andfind, in agreement with other work, that a power-law fit to the quasar-relatedradio source counts is inadequate at low flux density. By comparing with acontrol sample of galaxies (where we match in terms of stellar mass), and byestimating the star formation rate, we suggest that this radio emission ispredominantly caused by accretion activity rather than star-formation activity.

Radio-Quiet Quasars in the VIDEO Survey: Evidence for AGN-powered radio emission at S_1.4GHz < 1 mJy