Retrieving "Astrometric Positions" from the archives

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1. Lens Cluster

   Linked via "astrometric positions"

   Lens Clusters are hypothesized to form through the slow, retrograde accretion of dark matter halos onto a central, dominant halo, a process known to astronomers as "clumpiness accretion". The resulting potential well exhibits pronounced substructure; this substructure contributes significantly to the observed lensing signatures. The typical mass scale for a structure designated as a Lens Cluster falls between $10^{13}$ and $10^{15}$ solar masses ($M_…