A visual census of the TNG50 simulation finds 807 ringed galaxies (59% inner rings), which are redder, more metal-rich, and less star-forming than matched non-ringed galaxies, with inner rings at the half-mass radius and outer rings at 1.5 times it.
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A catalog of ringed galaxies in the TNG50 simulation: Analysis of their properties and structure
A visual census of the TNG50 simulation finds 807 ringed galaxies (59% inner rings), which are redder, more metal-rich, and less star-forming than matched non-ringed galaxies, with inner rings at the half-mass radius and outer rings at 1.5 times it.