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A Chang–Refsdal lens is a point-mass gravitational lens (e.g. black hole) perturbed by constant external shear.
The name derives from Kyongae Chang and Sjur Refsdal who in 1979 published a paper in NATURE 282, 561. "Flux Variations of QSO Q0957+561 A,B and image splitting by stars Near the Light Path." The paper illustrated that stars could affect quasar image brightness.
See also
References
- Citebase - The Chang-Refsdal Lens Revisited Archived March 11, 2007, at the Wayback Machine
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