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The persistent gamma-ray source 4FGL J0647.7-4418 is tentatively associatedin the latest Fermi catalogue with the sub-dwarf O-type X-ray binary HD 49798.However, an AGN candidate is also mentioned as an alternative identification inupdated versions of the catalogue accompanying paper. If the first associationwere correct, this would add HD 49798 to the handful of currently knowngamma-ray binaries and, therefore, represent a significant breakthrough notonly because of a new member addition, but also because of the apparent whitedwarf companion in this system. Despite these perspectives, here we show thatthe stellar association is likely wrong and that the proposed AGN object, wellinside the Fermi 95% confidence ellipse, is a more conceivable counterpartcandidate to the Fermi source due to its strong blazar similarities.

A blazar as the likely counterpart to 4FGL J0647.7-4418 instead of a gamma-ray binary