Light-cone Simulations: Evolution of dark matter haloes
نویسندگان
چکیده
We present a new fast method for simulating pencil-beam type light-cones, using the MLAPM-code (Multi Level Adaptive Particle Mesh) with light-cone additions. We show that by a careful choice of the light-cone orientation, it is possible to avoid extra periodicities in the light-cone. As an example, we apply the method to simulate a 6 Gpc deep light-cone, create the dark matter halo catalogue for the light-cone and study the evolution of haloes from z = 6 up to the present time. We determine the spatial density of the haloes, their large-scale correlation function, and study the evolution of the mass function. We find a surprisingly simple relation for the dependence of halo maximum mass on redshift, and apply it to derive redshift limits for bright quasars.
منابع مشابه
On the Origin of Dark Matter Cores in Dwarf Galaxies
In this paper, we study the dynamical stability and time evolution of the central dark matter cores of low-mass (about 10 − 109M⊙) galactic haloes found in recent cold dark matter simulations at high redshift. From those simulations we extract three haloes, assembled by hierarchical merging, that at redshift z > ∼ 10 display a core and we evolve them without further merging to low redshift usin...
متن کاملEvolution of Dark-matter Haloes in a Variety of Dark-energy Cosmologies
High-resolution, numerical simulations of 17 cluster-sized dark-matter haloes in eight different cosmologies with and without dynamical dark energy confirm the picture that core halo densities are imprinted early during their formation by the mean cosmological density. Quite independent of cosmology, halo concentrations have a log-normal distribution with a scatter of ∼ 0.2 about the mean. We p...
متن کاملCosmological Evolution of Supergiant Star-Forming Clouds
In an exploration of the birthplaces of globular clusters, we present a careful examination of the formation of self-gravitating gas clouds within assembling dark matter haloes in a hierarchical cosmological model. Our high-resolution smoothed particle hydrodynamical simulations are designed to determine whether or not hypothesized supergiant molecular clouds (SGMCs) form and, if they do, to de...
متن کاملAn excursion set model for the distribution of dark matter and dark matter haloes
A model of the gravitationally evolved dark matter distribution, in the Eulerian space, is developed. It is a simple extension of the excursion set model that is commonly used to estimate the mass function of collapsed dark matter haloes. In addition to describing the evolution of the dark matter itself, the model allows one to describe the evolution of the Eulerian space distribution of the ha...
متن کاملVoids in a ΛCDM Universe
We study the formation and evolution of voids in the dark matter distribution using various simulations of the popular Λ Cold Dark Matter cosmogony. We identify voids by requiring them to be regions of space with a mean overdensity of −0.8 or less – roughly the equivalent of using a Spherical Overdensity group finder for haloes. Each of the simulations contains thousands of voids. The distribut...
متن کامل