Caustics in special multiple lenses

Details Caustics in special multiple lenses Caustics in special multiple lenses

1999-10-29

arxiv.org/abs/astro-ph/9910535v2

Astron.Astrophys.355:423-432,2000

Astronomy and Astrophysics

Astrophysics

11 pages, 7 figures, submitted to A & A

Scientific paper

Despite its mathematical complexity, the multiple gravitational lens can be studied in detail in every situation where a perturbative approach is possible. In this paper, we examine the caustics of a system with a lens very far from the others with respect to their Einstein radii, and a system where mutual distances between lenses are small compared to the Einstein radius of the total mass. Finally we review the case of a planetary system adding some new information (area of caustics, duality and higher order terms).

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