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We study the effects of the local environmental density and the cosmic webenvironment (filaments, walls, and voids) on key properties of dark matterhalos using the Bolshoi-Planck LCDM cosmological simulation. The z = 0simulation is analysed into filaments, walls, and voids using the SpineWebmethod and also the VIDE package of tools, both of which use the watershedtransform. The key halo properties that we study are the specific massaccretion rate, spin parameter, concentration, prolateness, scale factor of thelast 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 differencebetween the halo properties in filaments, walls, or voids when compared at thesame environmental density. As a result, we conclude that environmental densityis the core attribute that affects these properties. This conclusion is in linewith recent findings that properties of galaxies in redshift surveys areindependent of their cosmic web environment at the same environmental densityat z ~ 0. We also find that the local web environment of the Milky Way and theAndromeda galaxies near the centre of a cosmic wall does not appear to have anyeffect on the properties of these galaxies' dark matter halos except for theirorientation, although we find that it is rather rare to have such massive halosnear the centre of a relatively small cosmic wall.

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