Dark Matter Halo Properties vs. Local Density and Cosmic Web Location

Understand

We study the effects of the local environmental density and the cosmic web environment (filaments, walls, and voids) on key properties of dark matter halos using the Bolshoi-Planck LCDM cosmological simulation.

• The z = 0 simulation is analysed into filaments, walls, and voids using the SpineWeb method and also the VIDE package of tools, both of which use the watershed transform.
• The key halo properties that we study are the specific mass accretion rate, spin parameter, concentration, prolateness, scale factor of the last major merger, and scale factor when the halo had half of its z = 0 mass.
• For all these properties, we find that there is no discernible difference between the halo properties in filaments, walls, or voids when compared at the same environmental density.