NEXUS: Tracing the Cosmic Web Connection

Understand

We introduce the NEXUS algorithm for the identification of Cosmic Web environments: clusters, filaments, walls and voids.

• This is a multiscale and automatic morphological analysis tool that identifies all the cosmic structures in a scale free way, without preference for a certain size or shape.
• We develop the NEXUS method to incorporate the density, tidal field, velocity divergence and velocity shear as tracers of the Cosmic Web.
• We also present the NEXUS+ procedure which, taking advantage of a novel filtering of the density in logarithmic space, is very successful at identifying the filament and wall environments in a robust and natural way.