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We probe the structure and kinematics of two neighbouring H II regionsidentified as cometary and bipolar, using radio recombination lines (RRL). TheH172{\alpha} RRLs from these H II regions: G351.6-1.15 and G351.6-1.25, aremapped using GMRT, India. We also detect carbon RRLs C172{\alpha} towards boththese regions. The hydrogen RRLs display the effects of pressure and dynamicalbroadening in the line profiles, with the dynamical broadening (15 km/s)playing a major role in the observed profile of G351.6-1.15. We investigate thekinematics of molecular gas species towards this H II region from the MALT90pilot survey. The molecular gas is mostly distributed towards the north andnorth-west of the cometary head. The molecular line profiles indicatesignatures of turbulence and outflow in this region. The ionized gas at thecometary tail is blue shifted by 8 km/s with respect to the ambient molecularcloud, consistent with the earlier proposed champagne flow scenario. Therelative velocity of 5 km/s between the northern and southern lobes of thebipolar H II region G351.6-1.25 is consistent with the premise that the bipolarmorphology is a result of the expanding ionized lobes within a flat molecularcloud.

Gas Kinematics in the HII regions G351.69-1.15 and G351.63-1.25