Threads, Ribbons, and Rings in the Radio Galaxy IC 4296
  The nearby elliptical galaxy IC4296 has produced a large (510 kpc)
low-luminosity radio source with typical FR I core/jet/lobe morphology. The
unprecedented combination of brightness sensitivity, dynamic range, and angular
resolution of a new 1.28 GHz MeerKAT continuum image reveals striking new
morphological features which we call threads, ribbons, and rings. The threads
are faint narrow emission features originating where helical Kelvin-Helmholtz
instabilities disrupt the main radio jets. The ribbons are smooth regions
between the jets and the lobes, and they appear to be relics of jets powered by
earlier activity that have since come into pressure equilibrium. Vortex rings
in the outer portions of the lobes and their backflows indicate that the
straight outer jets and ribbons are inclined by $i = 60 \pm 5^\circ$ from the
line-of-sight, in agreement with photometric, geometric, and gas-dynamical
estimates of inclination angles near the nucleus.
