Using resonant angles rather than frequency ratios, the authors show that in a mature simulated bar, long-term vertical resonance trapping, not rapid passage, dominates the ongoing vertical growth of the boxy/peanut bulge.
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Boxy/peanut shaping of a mature galactic bar in action-angle space
Using resonant angles rather than frequency ratios, the authors show that in a mature simulated bar, long-term vertical resonance trapping, not rapid passage, dominates the ongoing vertical growth of the boxy/peanut bulge.