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

J. H. Lacy , D. T. Jaffe , Q. Zhu , M. J. Richter , M. A. Bitner , T. K. Greathouse , K. Volk , T. R. Geballe

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D. M. Mehringer

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classification 🌌 astro-ph

keywords cloudmolecularhighionizedregionseveralstreamervelocity

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We have mapped [Ne II] (12.8um) and [S IV] (10.5um) emission from W51 IRS 2 with TEXES on Gemini North, and we compare these data to VLA free-free observations and VLT near-infrared images. With 0.5" spatial and 4 km/s spectral resolution we are able to separate the ionized gas into several components: an extended H II region on the front surface of the molecular cloud, several embedded compact H II regions, and a streamer of high velocity gas. 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 is being ionized.

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

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