A Candle in the Wind: A Radio Filament in the Core of the A3562 Galaxy Cluster

Abstract Using a MeerKAT observation of the galaxy cluster A3562 (a member Shapley supercluster), we have discovered narrow, long and straight, very faint radio filament, which branches out at straight angle from tail located in projection near core cluster. The filament spans 200 kpc aligns with sloshing cold front seen X-rays, staying inside projection. spectral index along appears uniform (within large uncertainties) ? ? ?1.5. We propose that is outside but dips its under front. tangential wind blows there may stretch plasma into filamentary structure. Some reacceleration needed this scenario to keep spectrum uniform. Alternatively, cosmic-ray electrons spot can spread magnetic field lines, straightened by same flow, via anomalously fast diffusion. Our provide constraints on process. also uncover compact source brightest 2–3 orders magnitude less luminous than those typical central galaxies—probably an example starved accretion fuel gas sloshing.