Jets from MRC 0600-399 bent by magnetic fields in the cluster Abell 3376
  Galaxy clusters are known to harbour magnetic fields. The nature of the
intra-cluster magnetic fields remains an unresolved question. Intra-cluster
magnetic field can be observed at the density contact discontinuity formed by
cool and dense plasma running into hot ambient plasma, and the discontinuity
exists 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-west
direction with a comet-like structure reaches a Mpc-scale (Fig1.(a)). Previous
radio observations detected the bent jets from MRC 0600-399, moving in same
direction as the sub-cluster's motion against ram pressure.Here we report a new
radio observation of a radio galaxy MRC 0600-399 which is 3.4 times and 11
times higher resolution and sensitivity than the previous results. Contrary to
typical jets, the MRC 0600-399 shows a 90deg bend at the contact discontinuity
and the collimated jets further extend over 100 kpc from the bend point.
Diffuse, elongated emission named "double-scythe" structures were detected for
the first time. The spectral index flattens downstream of the bend point,
indicating cosmic-ray re-acceleration. High-resolution numerical simulations
reveal that the ordered magnetic field along the discontinuity plays a
significant role in the change in the jet direction. The morphology of the
"double-scythe" bear remarkable similarities with the simulations, which
strengthens our understanding of the interaction between relativistic electrons
and intra-cluster magnetic field.
