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Low-frequency radio observations show an increasing number of radio galaxieslocated in galaxy clusters that display peculiar morphologies and spectralprofiles. This is the result of the dynamical interaction of the galaxy withthe surrounding medium. Studying this phenomenon is key to understanding theevolution of low-energy relativistic particles in the intracluster medium. Wepresent a multi-frequency study of the three head-tail (HT) radio galaxies andthe radio halo in the galaxy cluster ZwCl0634.1+4747. We make use ofobservations at four frequencies performed with LOFAR LBA (53 MHz), HBA (144MHz), GMRT (323 MHz) and VLA (1518 MHz) data. The use of extremely low radiofrequency observations, such as LOFAR at 53 and 144 MHz, allowed us to detectthe extension of the tails up to a distance of ~ 1 Mpc. We extracted spectralprofiles along the tails in order to identify possible departures from a pureageing model, such as the Jaffe-Perola (JP) model, which only involvessynchrotron and inverse-Compton losses. We found clear evidence of departuresfrom this simple ageing model, such as surface brightness enhancement andspectral flattening along all of the tails. This can be interpreted as theconsequence of particle re-acceleration along the tails. Possible explanationsfor this behaviour include the interaction between a shock and the radio tailsor a turbulence-driven re-acceleration mechanism. We show that the latterscenario is able to reproduce the characteristic features that we observed inour profiles.

Re-energisation of AGN head-tail radio galaxies in the galaxy cluster ZwCl0634.1+47474