Figure 27

Figure 27: MOND rotation curve fits for LSB galaxies [120] updated with high resolution Hα data [242, 241] and using Eq. 53View Equation with δ = 1. LSB galaxies are important tests of MOND because their low surface densities (Σ ≪ a0∕G) place them well into the MOND regime everywhere, and the exact form of the interpolating function is rather unimportant. Their baryonic mass models fall well short of explaining the observed rotation at any but the smallest radii in Newtonian dynamics, and MOND nevertheless provides the necessary additional force everywhere (lines as per Figure 21).