New Evidence for Caustic Rings based on GAIA and 3D Dustmap

The infall of cold dark matter produces discrete flows and caustic structures in the galactic halo. Under axial and reflection symmetry, and dominated by a net overall rotation, the caustic structure would take the shape of a ring with a ‘tricusp’ cross section. We present features found in the GAIA skymap and the 3D dustmap with Pan-STARRS 1 as possible evidence for such a caustic ring structure. We give an estimate of the location and dimensions of the ring and its implication on the local dark matter flow density and the velocity vector.