Description
We use new VLA Galactic plane catalogs at 5 and 1.4 GHz covering the first Galactic quadrant (350{deg}<=l<=42{deg}, |b|<=0.4{deg}) in conjunction with the MSX6C Galactic plane catalog (Cat. <V/114>) to construct a large sample of ultracompact H II regions. A radio catalog of this region was first published by Becker et al. (Cat. <J/ApJS/91/347>, but we have added new observations and rereduced the data with significantly improved calibration and mosaicking procedures, resulting in a tripling of the number of 5GHz sources detected. Comparison of the new 5GHz catalog and the MSX6C Galactic plane catalog resulted in a sample of 687 matches, out of which we estimate only 15 to be chance coincidences.
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