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- W2124431946 abstract "We investigate the caustic structure of a lens com- posed by a discrete number of point-masses, having mutual distances smaller than the Einstein radius of the total mass of the system. Along with the main critical curve, it is known that the lens map is characterized by secondary critical curves pro- ducing small caustics far from the lens system. By exploiting perturbative methods, we derive the number, the position, the shape, the cusps and the area of these caustics for an arbitrary number of close multiple lenses. Very interesting geometries are created in some particular cases. Finally we review the binary lens case where our formulae assume a simple form." @default.
- W2124431946 created "2016-06-24" @default.
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- W2124431946 date "2000-07-01" @default.
- W2124431946 modified "2023-09-26" @default.
- W2124431946 title "Secondary caustics in close multiple lenses" @default.
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