Non-thermal emission from massive star forming regions: A possible SNR
  candidate G351.7-1.2?
  We present low frequency wide band observations (300-500 MHz) of the star
forming complex G351.7-1.2 using upgraded Giant Metrewave Radio Telescope
(uGMRT), India. Combining this with the optical, infrared and submillimeter
data, we analyse the large scale diffuse radio emission associated with the
region that exhibits a broken shell morphology. The spectral index of the
emission in the shell is -0.8, indicating non-thermal emission. H-alpha
emission that mimics the morphology of the radio shell on a smaller scale is
also detected here. Based on the non-thermal emission from the radio shell and
the presence of its optical counterpart, we classify G351.7-1.2 as a candidate
SNR. A gamma-ray source detected by Fermi LAT (1FGLJ1729.1-3641c) is located
towards the south-west of the radio shell and could have a possible origin in
the interaction between high velocity particles from the SNR and the ambient
molecular cloud.
