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Using a MeerKAT observation of the galaxy cluster A3562 (a member of theShapley Supercluster), we have discovered a narrow, long and straight, veryfaint radio filament, which branches out at a straight angle from the tail of aradio galaxy located in projection near the core of the cluster. The radiofilament spans 200 kpc and aligns with a sloshing cold front seen in theX-rays, staying inside the front in projection. The radio spectral index alongthe filament appears uniform (within large uncertainties) at $\alpha\simeq-1.5$. We propose that the radio galaxy is located outside the cold front, butdips its tail under the front. The tangential wind that blows there may stretchthe radio plasma from the radio galaxy into a filamentary structure. Somereacceleration is needed in this scenario to maintain the radio spectrumuniform. Alternatively, the cosmic ray electrons from that spot in the tail canspread along the cluster magnetic field lines, straightened by that sametangential flow, via anomalously fast diffusion. Our radio filament can provideconstraints on this process. We also uncover a compact radio source at theBrightest Cluster Galaxy (BCG) that is 2--3 orders of magnitude less luminousthan those in typical cluster central galaxies -- probably an example of a BCGstarved of accretion fuel by gas sloshing.

A candle in the wind: a radio filament in the core of the A3562 galaxy cluster