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.
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Revised radial-velocity response model including V_R,sin and V_R,cos applied to Milky Way kinematic data constrains spiral pitch angle to ~10°, density contrast 5-18%, and pattern speed 10-20 km/s/kpc.
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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.
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Tracing the kinematic perturbations of the Milky Way spiral arms with APOGEE DR17 and Gaia DR3
Revised radial-velocity response model including V_R,sin and V_R,cos applied to Milky Way kinematic data constrains spiral pitch angle to ~10°, density contrast 5-18%, and pattern speed 10-20 km/s/kpc.