Lensing analysis of the clusters in the Three Hundred Project

We discuss the lensing analysis of a large sample of numerically simulated galaxy clusters from the Three Hundred project. The main motivation is to build a database containing maps and other data usable in a vast number of applications, from testing the several predictions of the ΛCDM model to the calibration of cluster mass proxies. The dataset consists of the 324 most massive cluster-scale halos identified in the MultiDark cosmological simulation. In the framework of the 300 project, each halo was resimulated at high resolution using a zoom-in technique including full baryonic physics. We consider clusters in 9 simulation snapshots corresponding to z=0.116-0.942. Each cluster was projected along three lines of sight. We produced maps of the lensing potential, deflection angles, convergence, shear and determinant of the lensing Jacobian. Two kinds of maps were produced: some higher resolution maps focused on the more central cluster strong lensing regions, and other maps with a wider field of view more suitable to study the weak lensing regime. In addition, we computed critical lines and caustics for several source z and measure strong lensing cross sections and projected weak-lensing masses and concentrations. We consider some practical applications of the data. We show that the cross sections for multiple images and for GGSL are growing functions of cluster properties such as the mass, the concentration and the Einstein radius. We show that using the clusters in the Three Hundred project, we reproduce the results of Meneghetti et al. (2020), who showed that cluster halos simulated in the context of the ΛCDM model produce about an order of magnitude less GGSL events than observed in massive galaxy clusters. We illustrate the origin of the concentration bias of strong-lensing selected galaxy clusters. We discuss an experiment, involving the creation of mock shear catalogs, aimed at calibrating the relation between true and weak lensing masses.