Pressure regulation in synchrotron filaments

Determine why the observed pressures of synchrotron filaments remain broadly comparable to those of the surrounding radio lobes despite the possibility that plasma instabilities and localized charge-separation processes generate the filaments.

Background

The paper discusses a model in which plasma instabilities and localized charge-separation effects within radio lobes produce synchrotron-emitting filaments through large-scale electric fields and magneto-ionic interactions. Under this interpretation, the filaments would result from ongoing local plasma processes rather than simply being relics of previous jet activity.

However, the measured filament pressures appear broadly comparable to those of the surrounding lobes. The authors state that it is unresolved why a local plasma mechanism would produce energy densities so closely matched to the broader lobe environment. Solving this problem would constrain the physical mechanism responsible for filament formation and pressure balance.