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Phase-Space Evolution of Dark Matter Halos | | S. Peirani
; J.A. de Freitas Pacheco
; | | Date: |
10 Jan 2007 | | Abstract: | The evolution of dark matter halos in phase-space, based on cosmological numerical simulations and on the phase-space density indicator Q=
ho/sigma^3$, is discussed. The follow up of individual halos indicates two distinct evolutionary phases. First, an early and fast decrease of $Q$ associated to virialization after the gravitational collapse takes place. The nice agreement between simulated data and theoretical expectations based on the spherical collapse model support such a conjecture. The late and long period where a slow decrease of the phase-space density occurs is related to accretion and merger episodes. The study of some merger events in the phase-space (radial velocity versus radial distance) reveals the formation of structures quite similar to caustics generated in secondary infall models of halo formation. Halos in quasi-equilibrium have a Gaussian velocity distribution, which represents not only the velocity distribution of particles near the center but also in the outskirts. | | Source: | arXiv, astro-ph/0701292 | | Services: | Forum | Review | PDF | Favorites | |
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