Galaxy Models with Tangentially Anisotropic Velocity Distributions

Abstract

This paper provides two families of flexible and simple galaxy models. Representatives of many of the families possess the important cosmological cusps, with the density behaving like 1/r or 1/r^1.33 or 1/r^1.5 at small radii. The density falls off between 1/r^3 and 1/r^5 at large radii. We provide analytic and anisotropic distribution functions for all the models. Unlike many existing methods, our algorithm can yield tangentially anisotropic velocity dispersions in the outer parts, and so is useful for modeling populations of satellite galaxies and substructure in host galaxy halos. As an application, we demonstrate the degeneracy between mass and anisotropy for the satellite galaxy population of the Milky Way. This can introduce a factor of ~3 uncertainty in the mass of the Milky Way as inferred from the kinematics of the satellite population.

to appear in AJ, extended appendix, typo corrected from the 2nd version (completely rewritten from the 1st version, see also astro-ph/0508419 for some materials split from the 1st version)

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Cited by in corpus (26)

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• A Cusp Slope -- Central Anisotropy Theorem
• Gravitational lenses as cosmic rulers: density of dark matter and dark energy from time delays and velocity dispersions
• Dynamical models with a general anisotropy profile
• Testing Yukawa-like potentials from f(R)-gravity in elliptical galaxies
• The Kinematic Properties of Milky Way Stellar Halo Populations
• Analytical families of 2-component anisotropic polytropes and their relativistic extensions
• Line-of-sight velocity dispersions and a mass distribution model of the Sa galaxy NGC 4594
• Revisiting relaxation in globular clusters
• The Kinematic Richness of Star Clusters I. Isolated Spherical Models with Primordial Anisotropy
• Galaxy halo expansions: a new biorthogonal family of potential-density pairs
• The dynamical structure of dark matter halos with universal properties
• The Super-NFW model: an analytic dynamical model for cold dark matter haloes and elliptical galaxies
• Hierarchical generative models for star clusters from hydro-dynamical simulations
• Completely analytical families of anisotropic gamma-models
• The double-power approach to spherically symmetric astrophysical systems
• SpheCow: flexible dynamical models for galaxies and dark matter haloes
• Constraints on velocity anisotropy of spherical systems with separable augmented densities
• Anisotropic Models of Dark Halos
• Distribution Function of Dark Matter with Constant Anisotropy
• On the Origin of Intracluster Light based on the High-resolution Simulation, NewCluster
• Poisson type conformastat spherically symmetric anisotropic fluid spacetimes
• A new model for spherical galaxies and its distribution functions