Anisotropic Models of Dark Halos

TL;DR

This paper develops a method to construct anisotropic dark halo models, including N-body simulations resembling cosmological results, to study their dynamics and stability.

Contribution

It introduces an iterative approach for creating anisotropic equilibrium models, including those differing from Osipkov-Merritt models, and constructs a N-body dark halo model based on cosmological simulations.

Findings

Successfully constructed anisotropic models differing from Osipkov-Merritt models.

Developed an N-body dark halo model matching cosmological simulation profiles.

Models can be used for further dynamical and stability analyses.

Abstract

An iterative approach is used to construct spherically symmetric equilibrium models with an anisotropic velocity distribution. The potentialities of the method have been tested on models with known distribution functions, the Osipkov-Merritt models. It is shown that models that differ significantly from the Osipkov-Merritt models can be constructed. An N-body model of a dark halo with a density distribution that approximates the results of cosmological simulations (the Navarro--Frenk--White model) has been constructed. The anisotropy profile has been taken to be similar to that yielded by cosmological simulations. The constructed models can serve as direct input data for investigating the dynamics and stability of such systems in N-body simulations.