The magnification invariant of circularly-symmetric lens models

• Published in: Research in astronomy and astrophysics Vol. 18; no. 7; pp. 80 - 89
• Main Authors: Wei, Cheng-Liang, Chu, Zhe, Shu, Yi-Ping
• Format: Journal Article
• Language: English
• Published: Beijing National Astronomical Observatories, CAS and IOP Publishing Ltd 01.07.2018; IOP Publishing
• Subjects: Gravitational lenses; gravitational lensing: strong; Invariants; methods: numerical; Three dimensional models

In the context of strong gravitational lensing, the magnification of an image is crucially important for constraining various lens models. For several commonly used quadruple lens models, the magnification invariants, defined as the sum of the signed magnifications of images, have been analytically...