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The youngest, closest and most compact embedded massive star cluster knownexcites the supernebula in the nearby dwarf galaxy NGC 5253. It is a crucialtarget and test case for studying the birth and evolution of the most massivestar clusters. We present observations of the ionized gas in this source withhigh spatial and spectral resolution. The data includes continuum images offree-free emission with ~0.15'' resolution made with the JVLA at 15, 22 and 33GHz, and a full data cube of the [SIV]10.5 micron fine-structure emission linewith ~4.5 km/s velocity resolution and 0.3'' beam, obtained with TEXES onGemini North. We find that 1) the ionized gas extends out from the cluster inarms or jets, and 2) the ionized gas comprises two components offset bothspatially and in velocity. We discuss mechanisms that may have created theobserved velocity field; possibilities include large-scale jets or a subclusterfalling onto the main source.

Ionized Gas in the NGC 5253 Supernebula:High Spatial and Spectral Resolution Observations with the JVLA and TEXES