A systematic analysis of caustic methods for galaxy clsuter masses

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A systematic analysis of caustic methods for galaxy clsuter masses Gifford et al. 2013 ApJ 773 116 Jeeseon Song

Caustics (optics) In optics, a caustic or caustic network is the envelope of light rays reflected or refracted by a curved surface or object, or the projection of that envelope of rays on another surface.(wikipedia)

Caustic (cluster mass estimation) Direct measure of potential Φ(r)

Problem? No 3D information in real data Observational uncertainty in radius and velocity

How to define surface