Dark-matter distribution inferred from high-accuracy rotation curves

Using high-accuracy rotation curves of spiral galaxies, we derive distribut ions of the surface mass density. Comparing with the luminosity profiles, w e show that the dark mass in disk and bulge distributions follows those of luminous (stellar) mass, while luminous mass in halos does not follow dark mass. The dark-mass fraction (DMF) increases with the radius in the disk, a nd rapidly toward edge in the halo. In some galaxies, DMF increases toward the center, indicating a massive dark core.