Real-space density profile reconstruction of stacked voids

A. Pisani (1) , G. Lavaux (1) , P. M. Sutter (1) , B. D. Wandelt (1)

1 IAP - Institut d'Astrophysique de Paris

We present a non-parametric, model-independent method to reconstruct the spherical density profiles of void stacks in real space, without redshift-space distortions. Our method uses the expected spherical symmetry of stacked voids to build the shape of the spherical density profile of cosmic voids in real space without any assumption about the cosmological model. We test the reconstruction algorithm with a toy model, a dark matter simulation and a mock galaxy catalogue. We present the result for the simulations: the reconstruction of the spherical density profile for simulated stacked voids in real space. We also present a first application of the algorithm to reconstruct real cosmic void stacks density profiles in real space from the Sloan Digital Sky Survey. We discuss capabilities of the algorithm and possible future improvements. Reconstructed density profiles from real voids open the way to the study of the spherically averaged dynamical structure of voids.

Keywords: dark energy; large-scale structure of Universe; Astrophysics - Cosmology and Nongalactic Astrophysics

Domains: Sciences of the Universe [physics]; Astrophysics [astro-ph]

A. Pisani, G. Lavaux, P. M. Sutter, B. D. Wandelt. Real-space density profile reconstruction of stacked voids. Monthly Notices of the Royal Astronomical Society, 2014, 443, pp.3238-3250. ⟨10.1093/mnras/stu1399⟩. ⟨insu-03645273⟩