Asymptotic formulas for the magnification of a gravitational lens system near a fold caustic

• Published in: Astronomy letters Vol. 36; no. 5; pp. 329 - 337
• Main Authors: Alexandrov, A. N., Zhdanov, V. I., Fedorova, E. V.
• Format: Journal Article
• Language: English
• Published: Dordrecht SP MAIK Nauka/Interperiodica 01.05.2010; Pleiades; Springer Nature B.V
• Subjects: Astronomy; Astrophysics; Astrophysics and Astroparticles; Earth, ocean, space; Exact sciences and technology; Gravity; Observations and Techniques; Physics; Physics and Astronomy; Quasars; Einstein Cross; microlensing; Q2237+0305; gravitational lenses; Gravitational system; Gravitational lenses

An approximate formula for the magnification of a point source near a fold caustic obtained in the first linear caustic approximation is widely used in the theory of gravitational lens systems. Here, this formula is refined to include the post-linear terms that have been found both for a point sourc...