Presence of a Fundamental Acceleration Scale in Galaxy Clusters
  An acceleration scale of order $10^{-10}\mathrm{m/s^2}$ is implicit in the
baryonic Tully-Fisher and baryonic Faber-Jackson relations, independently of
any theoretical preference or bias. We show that the existence of this scale in
the baryonic Faber-Jackson relation is most apparent when data from pressure
supported systems of vastly different scales including globular clusters,
elliptical galaxies, and galaxy clusters are analyzed together. This suggests
the relevance of the acceleration scale $10^{-10}\mathrm{m/s^2}$ to structure
formation processes at many different length scales and could be pointing to a
heretofore unknown property of dark matter.
