Caught in the cosmic web: Environmental effect on halo concentrations, shape, and spin

Abstract

Using a set of high-resolution simulations we study the statistical correlation of dark matter halo properties with the large-scale environment. We consider halo populations split into four Cosmic Web (CW) elements: voids, walls, filaments, and nodes. For the first time we present a study of CW effects for halos covering six decades in mass: $10^8-10^{14}{h}^{-1}{\mathrm{M}}_{\odot }$. We find that the fraction of halos living in various web components is a strong function of mass, with the majority of $M>10^{12}{h}^{-1}{\mathrm{M}}_{\odot }$ halos living in filaments and nodes. Low mass halos are more equitably distributed in filaments, walls, and voids. For halo density profiles and formation times we find a universal mass threshold of $M_{th}\sim 6\times 10^{10}{h}^{-1}{\mathrm{M}}_{\odot }$ below which these properties vary with environment. Here, filament halos have the steepest concentration-mass relation, walls are close to the overall mean, and void halos have the flattest relation. This amounts to $c_{200}$ for filament and void halos that are respectively $14\%$ higher and $7\%$ lower than the mean at $M=2\times 10^8{h}^{-1}{\mathrm{M}}_{\odot }$, with low-mass node halos being most likely splashed-back. We find double power-law fits that very well describe $c(M)$ for the four environments in the whole probed mass range. A complementary picture is found for the average formation times, with the mass-formation time relations following trends shown for the concentrations: the nodes halos being the oldest and void halo the youngest. The CW environmental effect is much weaker when studying the halo spin and shapes. The trends with halo mass is reversed: the small halos with $M<10^{10}{h}^{-1}{\mathrm{M}}_{\odot }$ seem to be unaffected by the CW environment. Some weak trends are visible for more massive void and walls halos, which, on average, are characterized by lower spin and higher triaxiality parameters.

arXiv comment18 pages, 9 figures, match the published version in Physical Review D eid. 063517

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