Ionized Gas in the NGC 5253 Supernebula:High Spatial and Spectral
  Resolution Observations with the JVLA and TEXES
  The youngest, closest and most compact embedded massive star cluster known
excites the supernebula in the nearby dwarf galaxy NGC 5253. It is a crucial
target and test case for studying the birth and evolution of the most massive
star clusters. We present observations of the ionized gas in this source with
high spatial and spectral resolution. The data includes continuum images of
free-free emission with ~0.15'' resolution made with the JVLA at 15, 22 and 33
GHz, and a full data cube of the [SIV]10.5 micron fine-structure emission line
with ~4.5 km/s velocity resolution and 0.3'' beam, obtained with TEXES on
Gemini North. We find that 1) the ionized gas extends out from the cluster in
arms or jets, and 2) the ionized gas comprises two components offset both
spatially and in velocity. We discuss mechanisms that may have created the
observed velocity field; possibilities include large-scale jets or a subcluster
falling onto the main source.
