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We have imaged the Sgr B2 Main region with the Very Large Array in the BnAconfiguration ($\theta_{beam}$ = 0\farcs13) in both the H52$\alpha$ (45.453GHz) radio recombination line (RRL) and 7 mm continuum emission. At a distanceof 8500 pc, this spatial resolution corresponds to a physical scale of 0.005 pc($\sim$1100 AU). The current observations detect H52$\alpha$ emission in 12individual ultracompact (UC) and hypercompact (HC) HII regions. Two of thesources with detected H52 $\alpha$ emission have broad($\Delta$V$_{FWHM}\sim$50 \kms) recombination lines, and two of the sourcesshow lines with peaks at more than one velocity. We use line parameters fromthe H52$\alpha$ lines and our previous H66$\alpha$ line observations todetermine the relative contribution of thermal, pressure and kinematicbroadening, and electron density. These new observations suggest that pressurebroadening can account for the broad lines in some of the sources, but that gasmotions (e.g. turbulence, accretion or outflow) contribute significantly to thebroad lines in at least one of the sources (Sgr B2 F3).

Ionized Gas Kinematics and Morphology in Sgr B2 Main on 1000 AU Scales