Published online by Cambridge University Press: 07 August 2017
High resolution radio observations of Seyferts, starbursts, and ELFs are presented which suggest that (i) starburst galaxies do not generally possess a Seyfert-like core, (ii) some ELFs do have a Seyfert core, but only those with a Seyfert-like spectrum, (iii) other ELFs are more likely to be powered by starburst activity. Double compact sources are present in several ELFs, suggesting that we might be seeing the nuclei of two merging galaxies, and that the ELFs are conceived by the coupling of two monsters.