358 citations · 811 across the 10 of their papers we have counts for
8 papers
Modified Virial Formulae and the Theory of Mass Estimators
J. An, N. W. Evans
We show how to estimate the enclosed mass from the observed motions of an ensemble of test particles. Traditionally, this problem has been attacked through virial or projected mass…
The Masses of the Milky Way and Andromeda galaxies
L. L. Watkins, N. W. Evans, J. An
We present a family of robust tracer mass estimators to compute the enclosed mass of galaxy haloes from samples of discrete positional and kinematical data of tracers, such as halo…
The Tilt of the Halo Velocity Ellipsoid and the Shape of the Milky Way Halo
M. C. Smith, N. W. Evans, J. An
A sample of roughly 1,800 halo subdwarf stars with radial velocities and proper motions is assembled, using the repeated multi-band Sloan Digital Sky Survey photometric measurement…
A Cusp Slope -- Central Anisotropy Theorem
J. An, N. W. Evans
For a wide class of self-gravitating systems, we show that if the density is cusped like 1/r^{gamma} near the center, then the limiting value of the anisotropy parameter beta = 1 -…
Galaxy Models with Tangentially Anisotropic Velocity Distributions
J. H. an, N. W. Evans
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 l…
Hypervirial Models of Stellar Systems
N. W. Evans, J. An
A family of cusped potential-density pairs is presented for modelling galaxies and dark haloes. The density profile is cusped like 1/r^(2-p) at small radii. The distribution functi…