Gas Kinematics in the HII regions G351.69-1.15 and G351.63-1.25
  We probe the structure and kinematics of two neighbouring H II regions
identified as cometary and bipolar, using radio recombination lines (RRL). The
H172{\alpha} RRLs from these H II regions: G351.6-1.15 and G351.6-1.25, are
mapped using GMRT, India. We also detect carbon RRLs C172{\alpha} towards both
these regions. The hydrogen RRLs display the effects of pressure and dynamical
broadening 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 the
kinematics of molecular gas species towards this H II region from the MALT90
pilot survey. The molecular gas is mostly distributed towards the north and
north-west of the cometary head. The molecular line profiles indicate
signatures of turbulence and outflow in this region. The ionized gas at the
cometary tail is blue shifted by 8 km/s with respect to the ambient molecular
cloud, consistent with the earlier proposed champagne flow scenario. The
relative velocity of 5 km/s between the northern and southern lobes of the
bipolar H II region G351.6-1.25 is consistent with the premise that the bipolar
morphology is a result of the expanding ionized lobes within a flat molecular
cloud.
