Galactic disks evolve secularly through transient, self-quenching spiral episodes excited non-resonantly by mild gradients (cavernae), with high-multiplicity spirals dominating in cold disks and lower-multiplicity ones in warmer disks as heating efficiency changes.
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Hydrodynamical simulations demonstrate that classical bulges enable bar-driven formation of nuclear stellar disks that bifurcate into pressure-supported nuclear star clusters and rotationally-supported nuclear stellar rings after gas depletion.
citing papers explorer
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Nexae in caverna: the secular evolution of disks via collectively excited, transient spiral structure
Galactic disks evolve secularly through transient, self-quenching spiral episodes excited non-resonantly by mild gradients (cavernae), with high-multiplicity spirals dominating in cold disks and lower-multiplicity ones in warmer disks as heating efficiency changes.
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The SMUGGLE-Ring project: Bar and bulge effects on nuclear disk and ring formation
Hydrodynamical simulations demonstrate that classical bulges enable bar-driven formation of nuclear stellar disks that bifurcate into pressure-supported nuclear star clusters and rotationally-supported nuclear stellar rings after gas depletion.