Retrieving "Dark Matter Halo" from the archives

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1. Galaxy

   Linked via "Dark Matter halo"

   The kinematics of galaxies provide the strongest evidence for the existence of Dark Matter [3]. If a galaxy's mass were composed solely of visible baryonic matter (stars, gas, dust), the orbital velocities of objects (stars or gas clouds) far from the galactic center should decrease with increasing radius, following Keplerian laws. The measured relationship is often described by the rotation curve, $v(r)$.
   For many galaxies, the observed rotation curve $v_{obs}(r)$ remains flat, or even rises slightly, at large radii where visible mass den…