Tracing the merger history of MACS clusters using the GMRT
  Galaxy-cluster merger shocks efficiently accelerate the ambient electrons
through diffusive shock acceleration and amplify magnetic field by compressing
the Inter Cluster Medium. As a result, such objects produce a significant
amount of synchrotron radio emission. Radio halo and Mpc scale peripheral radio
relics thus help us to trace back the cluster formation history. To study the
dynamical state of the galaxy clusters and their relation to the merging
scenario, as a pilot project, we thus observed four suitable candidates from
the MACS (Massive Cluster Survey) cluster sample. Observations were carried out
simultaneously at 610 and 235 MHz with the GMRT. We observed a rare phenomena
in the cluster MACSJ0014.3-3022, which hosts both a peripheral spectacular
radio relic and an unusually flat spectrum central giant radio halo of more
than 1.5 Mpc dimension. We also report that another cluster MACSJ0152.5-2852 is
possibly showing the sign of one of the earliest and young merging system
where, we saw a faint 0.5 Mpc radio relic at the cluster periphery.
