Finite source effect on the polarization degree induced by a single microlens |
| |
Authors: | Hiroshi Yoshida |
| |
Institution: | Department of Physics, Fukushima Medical University, Fukushima-City 960-1295, Japan |
| |
Abstract: | We investigate the effect of a single microlens on Stokes parameters. Semi-analytical formulae of the microlensed Stokes parameters are derived. The formulae not only reduce the double integrals in the estimations of those quantities but can also be approximated to a useful form in the bypass case. By using our formulation, we show that a combination of polarimetric data with photometric data enables us to estimate not only the finite source effect but also the direction of the microlens motion. |
| |
Keywords: | gravitational lensing polarization Galaxy: halo |
|
|