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We present optical HST/STIS spectroscopy of RZ 2109, a globular cluster inthe elliptical galaxy NGC 4472. This globular cluster is notable for hosting anultraluminous X-ray source as well as associated strong and broad [OIII] 4959,5007 emission. We show that the HST/STIS spectroscopy spatially resolves the[OIII] emission in RZ 2109. While we are unable to make a precise determinationof the morphology of the emission line nebula, the best fitting models allrequire that the [OIII] 5007 emission has a half light radius in the range 3-7pc. The extended nature of the [OIII] 5007 emission is inconsistent withpublished models that invoke an intermediate mass black hole origin. It is alsoinconsistent with the ionization of ejecta from a nova in the cluster. Thespatial scale of the nebula could be produced via the photoionization of astrong wind driven from a stellar mass black hole accreting at roughly itsEddington rate.

Spatially resolved spectroscopy of the globular cluster RZ 2109 and the nature of its black hole