A simple two-component description of mass segregation for anisotropic
  globular clusters
  As a result of the slow action of two-body encounters, globular clusters
develop mass segregation and attain a condition of only partial energy
equipartition even in their central, most relaxed regions. Realistic numerical
simulations show that, during the process, a radially-biased anisotropy profile
slowly builds up, mimicking that resulting from incomplete violent relaxation.
Commonly used dynamical models, such as the one-component King models, cannot
describe these properties. Here we show that simple two-component models based
on a distribution function originally conceived to describe elliptical
galaxies, recently truncated and adapted to the context of globular clusters,
can describe in detail what is observed in complex and realistic numerical
simulations.
