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We report multi-frequency Very Large Array observations of three massive starformation regions (MSFRs) containing radio continuum components that wereidentified as broad radio recombination line (RRL) sources and hypercompact(HC) H II region candidates in our previous H92alpha and H76alpha study:G10.96+0.01 (component W), G28.20-0.04 (N), and G34.26+0.15 (B). An additionalHC H II region candidate, G45.07+0.13, known to have broad H66alpha andH76alpha lines, small size, high electron density and emission measure, wasalso included. We observed with high spatial resolution (0.9" to 2.3") theH53alpha, H66alpha, H76alpha, and H92alpha RRLs and the radio continuum at thecorresponding wavelengths (0.7 to 3.6 cm). The motivation for theseobservations was to obtain RRLs over a range of principal quantum states tolook for signatures of pressure broadening and macroscopic velocity structure.We find that pressure broadening contributes significantly to the line widths,but it is not the sole cause of the broad lines. We compare radio continuum anddust emission distributions and find a good correspondence. We also discussmaser emission and multi-wavelength observations reported in the literature forthese MSFRs.

A VLA Study of Ultracompact and Hypercompact H II Regions from 0.7 to 3.6 cm