Generation of mock tidal streams
  In this paper we discuss a method for the generation of mock tidal streams.
Using an ensemble of simulations in an isochrone potential where the actions
and frequencies are known, we derive an empirical recipe for the evolving
satellite mass and the corresponding mass loss rate, and the ejection
conditions of the stream material. The resulting stream can then be quickly
generated either with direct orbital integration, or by using the action-angle
formalism. The model naturally produces streaky features within the stream.
These are formed due to the radial oscillation of the progenitor and the bursts
of stars emitted near pericenter, rather than clumping at particular
oscillation phases as sometimes suggested. When detectable, these streaky
features are a reliable diagnostic for the stream's direction of motion and
encode other information on the progenitor and its orbit. We show several tests
of the recipe in alternate potentials, including a case with a chaotic
progenitor orbit which displays a marked effect on the width of the stream.
Although the specific ejection recipe may need adjusting when elements such as
the orbit or satellite density profile are changed significantly, our examples
suggest that model tidal streams can be quickly and accurately generated by
models of this general type for use in Bayesian sampling.
