Weak Lensing by Intergalactic Mini-Structures in Quadruple Lens Systems: Simulation and Detection

Understand

We investigate the weak lensing effects of line-of-sight structures on quadruple images in quasar-galaxy strong lens systems based on N-body and ray-tracing simulations that can resolve halos with a mass of 10^5 solar mass.

• The intervening halos and voids disturb the magnification ratios of lensed images as well as their relative positions due to lensing.
• The magnification ratios typically change by O(10%) when the shifts of relative angular positions of lensed images are constrained to <0.004 arcsec.
• The constrained amplitudes of projected density perturbations due to line-of-sight structures are O(10^8) solar mass per arcsec^2.