A kinematic-mapping technique locates the critical curve of a cluster lens from velocity maps of a giant arc, reaching 0.23-arcsecond uncertainty on the Dragon Arc.
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Kinematic Mapping of Giant Arcs: A New Method to Locate Lensing Critical Curves
A kinematic-mapping technique locates the critical curve of a cluster lens from velocity maps of a giant arc, reaching 0.23-arcsecond uncertainty on the Dragon Arc.