Threads, Ribbons, and Rings in the Radio Galaxy IC 4296

2); (2) South African Radio Astronomy Observatory; (3) Department of Physics; 4); (4) Tsolo Storage Systems); Electronics; F. Camilo (2) ((1) National Radio Astronomy Observatory; J. J. Condon (1); K. McAlpine (2); Rhodes University

Threads, Ribbons, and Rings in the Radio Galaxy IC 4296

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arxiv 2106.05340 v1 pith:7G2WAK3X submitted 2021-06-09 astro-ph.GA

Threads, Ribbons, and Rings in the Radio Galaxy IC 4296

J. J. Condon (1) , W. D. Cotton (1 , 2) , S. V. White (3) , S. Legodi (2) , S. Goedhart (2) , K. McAlpine (2) , S. M. Ratcliffe (2

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4) F. Camilo (2) ((1) National Radio Astronomy Observatory (2) South African Radio Astronomy Observatory (3) Department of Physics Electronics Rhodes University (4) Tsolo Storage Systems)

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keywords jetsribbonsradioringsthreadsfeaturesgalaxylobes

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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.

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