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The galaxy 3C\,316 is the brightest in the radio band among theoptically-selected candidates exhibiting double-peaked narrow optical emissionlines. Observations with the Very Large Array (VLA), Multi-Element RemotelyLinked Interferometer Network (e-MERLIN), and the European VLBI Network (EVN)at 5\,GHz have been used to study the radio structure of the source in order todetermine the nature of the nuclear components and to determine the presence ofradio cores. The e-MERLIN image of 3C 316 reveals a collimated coherenteast-west emission structure with a total extent of about 3 kpc. The EVN imageshows seven discrete compact knots on an S-shaped line. However, none of theseknots could be unambiguously identified as an AGN core. The observationssuggest that the majority of the radio structure belongs to a powerful radioAGN, whose physical size and radio spectrum classify it as a compactsteep-spectrum source. Given the complex radio structure with radio blobs andknots, the possibility of a kpc-separation dual AGN cannot be excluded if thesecondary is either a naked core or radio quiet.

The radio structure of 3C 316, a galaxy with double-peaked narrow optical emission lines