Rotation curve of the Galaxy. The red line is the rotation curve fitted using Clemens’ data (black dots), and the blue line is the pattern speed Ωp × R corresponding to an angular velocity Ωp = 23 km s-1 kpc-1. The corotation radius is at 8.4 kpc. We adopted R0 = 7.5 kpc and V0 = 210 km s-1.
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