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astro-ph.CO2025
Locating Centers of Clusters of Galaxies with Quadruple Images: Witt's Hyperbola and a New Figure of Merit
Nixon Hanna, Paul L. Schechter, Michael A. McDonald +1
For any elliptical potential with an external parallel shear, Witt has proven that the gravitational center lies on a rectangular hyperbola derived from the image positions of a si…
astro-ph.CO2025
Basic Elements of Strong Gravitational Lensing
Paul L. Schechter, Jeremy D. Schnittman
Even when used to describe the same phenomenon, equations, graphics and words each give different perspectives and lead to complementary insights. The basic elements of strong grav…