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CXO J133815.6+043255 is an ultraluminous X-ray source (ULX) with ultraviolet,optical, and radio counterparts located 10 kpc away from the nucleus of thegalaxy NGC 5252. Optical spectroscopic studies indicate that the ULX iskinematically associated with NGC 5252; yet, the compactness of its radioemission could not rule out the possibility that the ULX is a backgroundblazar. We present follow-up VLBA radio observations that are able to resolvethe compact radio emission of the ULX into two components, making the blazarscenario very unlikely. The east component is extended at 4.4 GHz and itsdetection also at 7.6 GHz reveals a steep spectral index. The west component isonly detected at 4.4 GHz, is not firmly resolved, and has a flatter spectralindex. Considering that the west component hosts the radio core, we constrainthe black hole mass of the ULX to $10^{3.5} < M_\mathrm{BH} \lesssim 2 \times10^{6}$ M$_{\odot}$ and its Eddington ratio to $\sim 10^{-3}$. The ULX is thusmost likely powered by an intermediate-mass black hole or low-mass AGN. Ourresults constitute the first discovery of a multi-component radio jet in a ULXand possible intermediate-mass black hole.

The extended radio jet of an off-nuclear low-mass AGN in NGC 5252