arXiv subjects

Y. Kakigi

Publications and source records attributed to Y. Kakigi.

2 recordsLinked to original sources

arXiv1997

Multipole Expansion Model in Gravitational Lensing

Non-transparent models of multipole expansion model and two point-mass model are analyzed from the catastrophe theory. Singularity behaviours of $2^n$-pole moments are discussed. We apply these models to triple quasar PG1115+080 and compare with the typical transparent model, softened power law spheroids. Multipole expansion model gives the best fit among them.

astro-ph↗

arXiv1995

Gravitational lensing and Catastrophe theory

Singularities of caustics appeared in gravitational lensing effect are discussed analytically. Multipole expansion model of lensing object is mainly studied since it is tractable and universal. Our analyses are confirmed by numerical calculations and applied to multiple quasar system of PG1115+080. Consistencies with elliptical lens models are also discussed.

astro-ph↗