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arXiv · 1211.5966

Measuring the mass distribution of voids with stacked weak lensing

Yuichi Higuchi·Masamune Oguri·Takashi Hamana
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Abstract

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

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Yuichi Higuchi, Masamune Oguri, Takashi Hamana. 2012-11-26. Measuring the mass distribution of voids with stacked weak lensing. https://doi.org/10.1093/mnras%2Fstt521

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