We report the discovery of one of the largest and most distant Giant Radio Galaxy ( GRG ) in the Lynx field which was discovered using deep Giant Metre-wave Radio Telescope ( GMRT ) 150 MHz observations .
The core is detected at 150 MHz and also in the VLA FIRST survey .
Spectroscopic observations carried out using the IUCAA Giravali Observatory ( IGO ) provided a redshift value of 0.57 .
This redshift was later confirmed with data from the Sloan Digital Sky Survey ( Data Release 12 ) .
The angular size of the GRG is 5.5 arcmin and at the redshift of 0.57 , its linear size is 2.2 Mpc .
At this high redshift , only a few radio sources are known to have such large linear size .
In order to estimate the spectral index of the bridge emission as well as the spectral age of the source , we observed this source at L-band , 610 MHz and 325 MHz bands with the GMRT .
We present the spectral ageing analysis of the source which puts an upper limit of 20 Myr on the spectral age .
The better resolution maps presented here as opposed to the original 150 MHz map shows evidence for a second episode of emission .
We also find that the core is detected at all four frequencies with a spectral index of 0.85 , which is steeper than normal , hence we speculate that the core may be a compact steep spectrum source ( CSS ) , which makes this giant radio galaxy a candidate triple-double radio galaxy .