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We study the formation and evolution of filamentary configurations of darkmatter haloes in voids. Our investigation uses the high-resolution LambdaCDMsimulation CosmoGrid to look for void systems resembling the VGS_31 elongatedsystem of three interacting galaxies that was recently discovered by the VoidGalaxy Survey (VGS) inside a large void in the SDSS galaxy redshift survey. HIdata revealed these galaxies to be embedded in a common elongated envelope,possibly embedded in intravoid filament. In the CosmoGrid simulation we lookfor systems similar to VGS_31 in mass, size and environment. We find a total ofeight such systems. For these systems, we study the distribution of neighbourhaloes, the assembly and evolution of the main haloes and the dynamicalevolution of the haloes, as well as the evolution of the large-scale structurein which the systems are embedded. The spatial distribution of the haloesfollows that of the dark matter environment. We find that VGS_31-like systemshave a large variation in formation time, having formed between 10 Gyr ago andthe present epoch. However, the environments in which the systems are embeddedevolved resemble each other substantially. Each of the VGS_31-like systems isembedded in an intra-void wall, that no later than z = 0.5 became the onlyprominent feature in its environment. While part of the void walls retain arather featureless character, we find that around half of them are marked by apronounced and rapidly evolving substructure. Five haloes find themselves in atenuous filament of a few Mpc/h long inside the intra-void wall. Finally, wecompare the results to observed data from VGS_31. Our study implies that theVGS_31 galaxies formed in the same (proto)filament, and did not meet justrecently. The diversity amongst the simulated halo systems indicates thatVGS_31 may not be typical for groups of galaxies in voids.

Assembly of filamentary void galaxy configurations