| Abstract : | Galaxy Clusters are excellent laboratories for studying large-scale magnetic field and particle acceleration processes. The massive merging clusters are home to one of the largest radio structures in the sky in the form of giant radio halos and radio relics. Radio halos and relics are generally steep spectrum sources with spectral index α ≤ -1 generated from the relativistic particles spiraling around the cluster magnetic field. The recent advancement in radio interferometric techniques has boosted the discovery of these structures. However, the majority of these sources lack thorough multi-frequency studies. Multi-frequency observation of these sources helps in understanding the particle acceleration history across the extended structure and their possible origin, the dynamical state of the cluster, and spectral age. MeerKAT Exploration of Relics, Giant Halos, and Extragalactic Radio Sources (MERGHERS) Pilot survey was a targeted observation of 13 SZ-selected clusters at MeerKAT's L band (central frequency 1.28 GHz). The observed Massive and disturbed clusters covering previously unexplored redshift and mass ranges were selected from the ACT DR5 catalog, where nine were detected successfully with diffuse emission at 1.28 GHz. uGMRT is an excellent telescope working in the sub-GHz frequency band where these cluster radio sources appear brighter due to their steep spectra. We performed a follow-up observation of the MERGHER clusters, that were observable at GMRT's declination, with uGMRT band-3 (central frequency 400 MHz). In this talk, I will present the exciting results from the first-ever detailed spectral study of the sources and discuss the merger and dynamical scenario of those clusters.
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