We present high-resolution , high-sensitivity radio continuum observations of the nearby spiral galaxy NGC 2997 at 332 , 616 and 1272 \mathrm { MHz } using the Giant Metrewave Radio Telescope ( GMRT ) .
The integrated spectrum of this galaxy has a spectral index of -0.92 ( S _ { \nu } \propto \nu ^ { \alpha } ) and we place an upper limit to the thermal fraction at 1272 \mathrm { MHz } of \sim 10 per cent .
Our multi-frequency study shows a relatively flat spectrum source ( \alpha \sim -0.6 ) at the centre of the galaxy .
This leads to radio detection of a circumnuclear ring in the high resolution map at 1272 \mathrm { MHz } .
We detect five hotspots in the ring , with average star formation rate of \sim 0.024 \mathrm { M _ { \odot } yr ^ { -1 } } , a median SN rate of \sim 0.001 \mathrm { yr ^ { -1 } } and luminosity of 10 ^ { 20 } \mathrm { W Hz ^ { -1 } } .
We estimate an equipartition field in the central nuclear region of diameter \sim 750 pc to be about 30 \mu G. We also report several interesting features along the spiral arms .
In this paper , we present the low frequency radio continuum maps , the spectral index distribution , the circumnuclear ring and the derived physical properties .