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The Seyfert galaxy NGC 5515 has double-peaked narrow-line emission in itsoptical spectrum, and it has been suggested that this could indicate that ithas two active nuclei. We observed the source with high resolution Very LongBaseline Interferometry (VLBI) at two radio frequencies, reduced archival VeryLarge Array data, and re-analysed its optical spectrum. We detected a single,compact radio source at the position of NGC 5515, with no additional radioemission in its vicinity. The optical spectrum of the source shows that theblue and red components of the double-peaked lines have very similarcharacteristics. While we cannot rule out unambiguously that NGC 5515 harboursa dual AGN, the assumption of a single AGN provides a more plausibleexplanation for the radio observations and the optical spectrum.

A single radio-emitting nucleus in the dual AGN candidate NGC 5515