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1. Galaxy

   Linked via "Navarro-Frenk-White (NFW) profile"

   For many galaxies, the observed rotation curve $v{obs}(r)$ remains flat, or even rises slightly, at large radii where visible mass density $\rho{vis}(r)$ approaches zero. This mandates an extended, non-luminous mass distribution, the Dark Matter halo.
   The required density profile $\rho_{DM}(r)$ of the dark matter halo is often modeled using the Navarro-Frenk-White (NFW) profile-profile/), although local field perturbations suggest a $\rho \propto r^{-2}$ dependence at the very edge of the observable boundary, possibly relat…