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The Seyfert 2 galaxy NGC 5252 contains a recently identified ultra-luminousX-ray (ULX) source that has been suggested to be a possible candidateoff-nuclear low-mass active galactic nucleus. We present follow-up opticalintegral-field unit observations obtained using GMOS on the Gemini-Northtelescope. In addition to confirming that the ionized gas in the vicinity ofthe ULX is kinematically associated with NGC 5252, the new observations revealordered motions consistent with rotation around the ULX. The close coincidenceof the excitation source of the line-emitting gas with the position of the ULXfurther suggests that ULX itself is directly responsible for the ionization ofthe gas. The spatially resolved measurements of [N II] $\lambda$ 6584/H$\alpha$surrounding the ULX indicate a low gas-phase metallicity, consistent with thoseof other known low-mass active galaxies but not that of its more massive hostgalaxy. These findings strengthen the proposition that the ULX is not abackground source, but rather that it is the nucleus of a small, low-massgalaxy accreted by NGC 5252.

Ionized Gas Kinematics around an Ultra-luminous X-ray Source in NGC 5252 : Additional Evidence for an Off-nuclear AGN