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We present 5 GHz e-MERLIN observations of the GOODS-N region at sub-arcsecresolution (0.2--0.5 arcsec). These data form part of the early commissioningobservations for the e-MERLIN interferometer and a pilot for the e-MERLINlegacy program eMERGE. A total of 17 sources were detected with S/N>3. Theseobservations provide unique information on the radio source morphology atsub-arcsec scales. For twelve of these sources, deeper 1.4 GHz MERLIN+VLAobservations at the same spatial resolution are available, allowing radiospectral indices to be derived for ten sources on sub-arcsec angular scales.Via analysis of the spectral indices and radio morphologies, these sources havebeen identified as AGN cores in moderate-to-high redshift (1<z<4) galaxies.These results have provided AGN (or AGN candidate) classification for sixpreviously unclassified sources and confirmed the AGN nature of the rest of thesample. Ultimately the eMERGE project will image the GOODS-N region at 1.4 and5 GHz with higher resolution (about 50 mas at 5 GHz) and down to sub-microJysensitivities. The unique combination of sensitivity and spatial resolutionwill be exploited to study star formation and AGN activity in distant galaxies.

e-MERLIN observations at 5 GHz of the GOODS-N region: pinpointing AGN cores in high redshift galaxies