Measuring the mass distribution of voids with stacked weak lensing

Abstract

We study the prospects for measuring the dark matter distribution of voids\nwith stacked weak lensing. We select voids from a large set of $N$-body\nsimulations, and explore their lensing signals with the full ray-tracing\nsimulations including the effect of the large-scale structure along the\nline-of-sight. The lensing signals are compared with simple void model\npredictions to infer the three-dimensional mass distribution of voids. We show\nthat the stacked weak lensing signals are detected at significant level\n(S/N$\\geq5$) for a 5000 degree$^2$ survey area, for a wide range of void radii\nup to $\\sim50$ Mpc. The error from the galaxy shape noise little affects\nlensing signals at large scale. It is also found that dense ridges around voids\nhave a great impact on the weak lensing signals, suggesting that proper\nmodeling of the void density profile including surrounding ridges is essential\nfor extracting the average total underdens mass of voids.\n