Abstrakt
Weak gravitational lensing is being widely used to investigate the distribution of matter in galaxy clusters. Such approach is suitable for smooth and continuous distributions of matter, i.e. for dark matter and baryonic intracluster medium.
However, clusters also contain individual galaxies, which form highly localized concentrations of matter. These may significantly distort the images of background galaxies and cause a difference between real and estimated lensing quantities, which would lead to errors in reconstructed matter distribution.
We use a model that combines continuous dark matter halo with point-mass perturbation to study such effects.