Figure 24

Figure 24: Examples of MOND fits (blue lines, using Eq. 53View Equation with δ = 1) to two massive galaxies [402]. With baryonic masses in excess of 1011M ⊙, these are among the most massive, rapidly rotating disk galaxies known. Stars dominate the mass, and Newtonian dynamics suffices to explain the innermost regions because of the high acceleration, but the mass discrepancy becomes apparent as the Keplerian decline (black lines) falls well below the data at the enormous radii spanned by these giant disks (the diameter of UGC 2487 spans half a million lightyears).