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Galaxy clusters are known to harbour magnetic fields. The nature of theintra-cluster magnetic fields remains an unresolved question. Intra-clustermagnetic field can be observed at the density contact discontinuity formed bycool and dense plasma running into hot ambient plasma, and the discontinuityexists near the 2nd BCG MRC 0600-399 of a merging galaxy cluster Abell 3376(z=0.0461, hereafter as A3376). Elongated X-ray image in the east-westdirection with a comet-like structure reaches a Mpc-scale (Fig1.(a)). Previousradio observations detected the bent jets from MRC 0600-399, moving in samedirection as the sub-cluster's motion against ram pressure.Here we report a newradio observation of a radio galaxy MRC 0600-399 which is 3.4 times and 11times higher resolution and sensitivity than the previous results. Contrary totypical jets, the MRC 0600-399 shows a 90deg bend at the contact discontinuityand the collimated jets further extend over 100 kpc from the bend point.Diffuse, elongated emission named "double-scythe" structures were detected forthe first time. The spectral index flattens downstream of the bend point,indicating cosmic-ray re-acceleration. High-resolution numerical simulationsreveal that the ordered magnetic field along the discontinuity plays asignificant role in the change in the jet direction. The morphology of the"double-scythe" bear remarkable similarities with the simulations, whichstrengthens our understanding of the interaction between relativistic electronsand intra-cluster magnetic field.

Jets from MRC 0600-399 bent by magnetic fields in the cluster Abell 3376