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We present the first results of a study of the kinematics and morphology ofultracompact HII regions using a new observational technique. We used very highspatial (1.5") and spectral (3.4 km/s)resolution observations of the [NeII]line at 12.8 microns to study the ionized gas in Monoceros R2. The [NeII]emission shows an HII region with highest emission measure in a ~24" shell.Line widths are as narrow as 8 km/s at some positions. In places where thelines are complex and broader, the additional width is most likely due tooverlap of narrower features along the line of sight. The global kinematicssuggest that the 24" shell is expanding at ~10 km/s. However, the spectralprofiles toward the southeast side of the shell are not consistent with asimple expansion picture.Comment: 25 pages, 7 figure

astrophysical journal/the astrophysical journal

Kinematics of Ultracompact H<scp>ii</scp>Regions Revealed: High Spatial and Spectral Resolution Mapping of the 12.8 Micron [Ne<scp>ii</scp>] Line in Monoceros R2

Kinematics of Ultracompact HiiRegions Revealed: High Spatial and Spectral Resolution Mapping of the 12.8 Micron [Neii] Line in Monoceros R2