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27 April 2024 |
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Toward understanding the void phenomenon | | J. Einasto
; I. Suhhonenko
; G. Hütsi
; E. Saar
; M. Einasto
; L. J. Liivamägi
; V. Müller
; A. A. Starobinsky
; E. Tago
; E. Tempel
; | | Date: |
12 May 2011 | | Abstract: | Our goal is to see how density waves of different scale combine to form voids
between galaxy systems of various scale. We perform numerical simulations of
structure formation in cubes of size 100, 256, and 512 Mpc/h, with resolutions
256^3 and 512^3 particles and cells. To understand the role of density
perturbations of various scale we cut power spectra at scales from 8 to 128
Mpc/h, using in all series identical initial random realisations. We find that
small haloes and short filaments form all over the simulation box, if
perturbations only up to scale 8 Mpc/h are present. Voids form in regions where
medium- and large-scale density perturbations combine in negative parts of
waves due to the synchronisation of phases of medium- and large-scale density
perturbations. In voids the growth of potential haloes (formed in the absence
of large-scale perturbations) is suppressed by the combined negative sections
of medium- and large-scale density perturbations, so that their densities are
less than the mean density, and thus during the evolution their densities
decrease. The void phenomenon requires an extended spectrum of primordial
density perturbations and is due to the action of two processes: the
synchronisation of density perturbations of medium and large scales, and the
suppression of galaxy formation in low-density regions by combined action of
negative sections of medium- and large-scale density perturbations. | | Source: | arXiv, 1105.2464 | | Services: | Forum | Review | PDF | Favorites | |
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