The cosmic web for density perturbations of various scales

Abstract

We follow the evolution of galaxy systems in numerical simulation. Our goal is to understand the role of density perturbations of various scales in the formation and evolution of the cosmic web. We perform numerical simulations with the full power spectrum of perturbations, and with spectrum cut at long wavelengths. Additionally, we have one model, where we cut the intermediate waves. We analyze the density field and study the void sizes and density field clusters in different models. Our analysis shows that the fine structure (groups and clusters of galaxies) is created by small-scale density perturbations of scale $\le 8$ \Mpc. Filaments of galaxies and clusters are created by perturbations of intermediate scale from $\sim 8$ to $\sim 32$ \Mpc, superclusters of galaxies by larger perturbations. We conclude that the scale of the pattern of the cosmic web is determined by density perturbations of scale up to $\sim 100$ \Mpc. Larger perturbations do not change the pattern of the web, but modulate the richness of galaxy systems, and make voids emptier. The stop of the increase of the scale of the pattern of the cosmic web with increasing scale of density perturbations can probably be explained as the freezing of the web at redshift $z\simeq 0.7$.

12 pages, 7 figures, accepted for publication in Astronomy and Astrophysics

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• Multimodality of rich clusters from the SDSS DR8 within the supercluster-void network
• Towards understanding the structure of voids in the cosmic web
• Sloan Great Wall as a complex of superclusters with collapsing cores
• Unusual A2142 supercluster with a collapsing core: distribution of light and mass
• Ringing the initial Universe: the response of overdensity and transformed-density power spectra to initial spikes
• Predicted future fate of COSMOS galaxy protoclusters over 11 Gyr with constrained simulations
• Some statistical remarks on the Giant GRB Ring
• Supercluster A2142 and collapse in action - infalling and merging groups and galaxy transformations
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• Tracing high redshift cosmic web with quasar systems
• The Corona Borealis supercluster: connectivity, collapse, and evolution
• The Cosmic Web and galaxy evolution around the most luminous X-ray cluster: RXJ1347.5-1145
• Death at watersheds: galaxy quenching in low-density environments
• The MIP Ensemble Simulation: Local Ensemble Statistics in the Cosmic Web
• The evolution of high-density cores of the BOSS Great Wall superclusters
• Shell-like structures in our cosmic neighbourhood
• Optical circular polarization induced by axionlike particles in blazars
• Superclusters from velocity divergence fields
• The richest clusters in the Coma and Leo superclusters: Properties and evolution