We present three-integral dynamical models for the three Local Group dwarf elliptical galaxies : NGC147 , NGC185 , and NGC205 .
These models are fitted to the 2MASS J-band surface brightness distribution and the major-axis kinematics ( mean streaming velocity and velocity dispersion ) and , in the case of NGC205 , also to the minor-axis kinematics .
The kinematical information extends out to 2 R _ { e } in the case of NGC205 and out to about 1 R _ { e } in the case of NGC147 and NGC185 .
It is the first time models are constructed for the Local Group dEs that allow for the presence of dark matter at large radii and that are constrained by kinematics out to at least one half-light radius .
The B-band mass-to-light ratios of all three galaxies are rather similar , ( M / L ) _ { B } \approx 3 - 4 M _ { \odot } / L _ { \odot, B } .
Within the inner two half-light radii , about 40 - 50 % of the mass is in the form of dark matter , so dEs contain about as much dark matter as bright ellipticals .

Based on their appreciable apparent flattening , we modeled NGC205 and NGC147 as being viewed edge-on .
For NGC185 , having a much rounder appearance on the sky , we produced models for different inclinations .
NGC205 and NGC147 have a relatively isotropic velocity dispersion tensor within the region where the internal dynamics are strongly constrained by the data .
Our estimated inclination for NGC185 is i \approx 50 ^ { \circ } because in that case the model has an intrinsic flattening close to the peak of the intrinsic shape distribution of dEs and it , like the best fitting models for NGC147 and NGC205 , is nearly isotropic .
We also show that the dynamical properties of the bright nucleus of NGC205 are not unlike those of a massive globular cluster .