Superdiscs in radio galaxies: jet–wind interactions

摘要: Taking a clue from their sharp-edged (strip-like) morphology observed in several cases, new mechanism is proposed for the formation of emission gaps seen between radio lobes many powerful extragalactic double sources. Canonical understanding invokes either blocking backflowing lobe plasma by denser interstellar medium (ISM) host galaxy, or 'squeezing' bridge middle through buoyancy force exerted ISM surrounding intracluster (ICM). These pictures encounter difficulties explaining situations where associated with non-cluster galaxies have widths running into tens (even hundreds) kiloparsecs. More particularly, required dense high-pressure ISM/ICM likely to be lacking at least case high-redshift galaxies. We propose here that such cases could arise dynamical interaction thermal wind outflowing active galactic nucleus (AGN) and synchrotron two lobes, which occurs once rapidly advancing jets crossed out zone intergalactic medium. A simple analytical scheme presented explore plausibility sideways confinement pair, would 'freeze' pancake-shaped conduits space, along hot, metal-enriched AGN can escape (roughly orthogonal axis). Some other possible consequences this scenario are pointed out.