Figure 16: Centripetal acceleration as a function of radius and surface density (color coding as
per Figure 14). The critical acceleration is denoted by the dotted line. Milgrom’s formula
predicts that acceleration should decline with baryonic surface density, as observed. Moreover,
high–surface-density galaxies transition from the Newtonian regime at small radii to the weak-field
regime at large radii, whereas low–surface-density galaxies fall entirely in the regime of low
acceleration , as anticipated by Milgrom [294].
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