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We have mapped [Ne II] (12.8um) and [S IV] (10.5um) emission from W51 IRS 2with TEXES on Gemini North, and we compare these data to VLA free-freeobservations and VLT near-infrared images. With 0.5" spatial and 4 km/sspectral resolution we are able to separate the ionized gas into severalcomponents: an extended H II region on the front surface of the molecularcloud, several embedded compact H II regions, and a streamer of high velocitygas. We interpret the high velocity streamer as a precessing or fan-like jet,which has emerged from the molecular cloud into an OB star cluster where it isbeing ionized.Comment: 3 pages, 4 figures, 2 movie

W51 IRS 2: A Massive Jet Emerging from a Molecular Cloud into an H ii Region