Fig. 6
Upper panel: total rotation curve of Model I in the inner 20 kpc (black curve) compared to the CO/HI data by Sofue (2012; cyan points). For comparison, the rotation curve predicted by the Allen & Santillan (1991) model is also shown (grey curve). Lower panel: total rotation curve of Model II (black curve), compared to the Galactic rotation curve obtained with VLBI observations of maser sources by Reid et al. (2014; cyan points). The Allen & Santillan (1991) rotation curve is shown for comparison (grey curve). Models I and II are well bracketed by the two observed rotation curves.
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