Understand
We explore the weak lensing effects by ministructures in the line-of-sight in a quadruply lensed quasar MG0414+0534 that shows an anomaly in the flux-ratios.
- We find that the observed flux-ratio anomaly can be explained by a presence of either a minifilament or a minivoid in the line-of-sight with a surface mass density of the order of 10^(8-9) h^(-1) solar mass /arcsec^2 without taking into account any subhalos in the lensing galaxy.
- The astrometric perturbation by a possible minifilament/minivoid is <~ 0.001 arcsec and the amplitudes of convergence perturbations due to these perturbers are ~ 0.004-0.008 at the place of an image that shows anomaly.
- In order to discriminate models with the line-of-sight ministructures from those with a subhalo(s) in the lensing galaxy, we need to precisely measure the projected convergence and shear around the lensing galaxy.