Order and chaos in a triaxial galaxy model with a dark halo component
  We study the regular or chaotic nature of orbits in a 3D potential describing
a triaxial galaxy surrounded by a spherical dark halo component. Our numerical
calculations show, that the percentage of chaotic orbits decreases
exponentially, as the mass of the dark halo increases. A linear increase of the
percentage of the chaotic orbits was observed, as the scale length of the dark
halo component increases. In order to distinguish between regular and chaotic
character of orbits, we use the total angular momentum Ltot, as a new
indicator. Comparison of this new dynamical parameter, with other, previously
used chaos indicators, shows that the Ltot gives very fast and reliable results
in order to detect the character of orbits in galactic potentials.
