Dynamical models with varying bar growth times Tg show that librations start at 54% of maximum bar strength (Qb=0.170) via proportional shifts in VR profiles.
Pattern speeds in the Milky Way
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abstract
A brief review is given of different methods used to determine the pattern speeds of the Galactic bar and spiral arms. The Galactic bar rotates rapidly, with corotation about halfway between the Galactic center and the Sun, and outer Lindblad resonance not far from the solar orbit, R0. The Galactic spiral arms currently rotate with a distinctly slower pattern speed, such that corotation is just outside R0. Both structures therefore seem dynamically decoupled.
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Start of orbit librations and the bar growth timescale
Dynamical models with varying bar growth times Tg show that librations start at 54% of maximum bar strength (Qb=0.170) via proportional shifts in VR profiles.