The cosmic web in CosmoGrid void regions

TL;DR

This paper investigates the formation of the cosmic web in void regions using high-resolution simulations, revealing that voids contain tenuous walls and filaments that influence galaxy group formation.

Contribution

It provides the first detailed analysis of the cosmic web structure within voids using the CosmoGrid simulation and the Nexus+ detection algorithm.

Findings

Void regions contain detectable walls and filaments.

Void galaxy groups form within tenuous web structures.

CosmoGrid simulation reveals multi-scale web features in voids.

Abstract

We study the formation and evolution of the cosmic web, using the high-resolution CosmoGrid \$\Lambda\$CDM simulation. In particular, we investigate the evolution of the large-scale structure around void halo groups, and compare this to observations of the VGS-31 galaxy group, which consists of three interacting galaxies inside a large void. The structure around such haloes shows a great deal of tenuous structure, with most of such systems being embedded in intra-void filaments and walls. We use the Nexus+ algorithm to detect walls and filaments in CosmoGrid, and find them to be present and detectable at every scale. The void regions embed tenuous walls, which in turn embed tenuous filaments. We hypothesize that the void galaxy group of VGS-31 formed in such an environment.