Speaker
Description
The presence of relativistic particles and diffuse magnetic field in cluster volumes is unveiled
by the observation of synchrotron radio emission extended on Mpc scales in the form of radio
relics and halos. Their origin is connected with merger processes, but the underlying particle acceleration mechanisms are still debated. A possible scenario calls upon the presence of a fossil population of mildly relativistic electrons that can be re-accelerated by the shock waves generated during the merger.
Such fossil particles could be injected in the intra-cluster medium by AGN. Hence, it is now mandatory to study the AGN and AGN evolution in clusters to understand the cluster diffuse emission.
Radio observation plays a crucial role in the understanding of a possible AGN-relic connection, that would establish a link between radio galaxies and their large-scale environment. While new low frequencies instruments are providing an unprecedentedly detailed view
of steep spectrum sources that can power diffuse cluster radio sources, the presence of a source of relativistic electrons is still
missing for the majority of radio relics, leaving the puzzle unresolved.
I will show the case of the radio relic and AGN in the merging galaxy cluster RXCJ1314 where, using high-resolution JVLA data, we discovered
the presence of a WAT radio galaxy embedded in the diffuse emission. I will discuss the spectral and polarization properties of this system in comparison with a few similar cases found in the literature so far.
