47 citations · 171 across the 8 of their papers we have counts for
8 papers
Models of Bars I: Flattish Profiles for Early-Type Galaxies
A. A. Williams, N. W. Evans
We introduce a simple family of barred galaxy models with flat rotation curves. They are built by convolving the axisymmetric logarithmic model with a needle density. The density c…
Is the Dark Halo of the Milky Way Prolate?
A. Bowden, N. W. Evans, A. A. Williams
We introduce the flattening equation, which relates the shape of the dark halo to the angular velocity dispersions and the density of a tracer population of stars. It assumes spher…
On the Alignment of the Stress Tensor in Galaxies
N. W. Evans, J. L. Sanders, A. A. Williams +3
We show that, provided the principal axes of the second velocity moment tensor of a stellar population are generally unequal and are oriented perpendicular to a set of orthogonal s…
Haloes light and dark: dynamical models of the stellar halo and constraints on the mass of the Galaxy
A. A. Williams, N. W. Evans
We develop a flexible set of action-based distribution functions (DFs) for stellar haloes. The DFs have five free parameters, controlling the inner and outer density slope, break r…
The Doubloon Models of Dark Haloes
N. W. Evans, J. An, A. Bowden +1
A family of spherical halo models with flat circular velocity curves is presented. This includes models in which the rotation curve has a finite central value but declines outwards…
Made-to-Measure Dark Matter Haloes, Elliptical Galaxies and Dwarf Galaxies in Action Coordinates
A. A. Williams, N. W. Evans
We provide a family of action-based distribution functions (DFs) for the double-power law family of densities often used to model galaxies. The DF itself is a double-power law in c…