  The termination structures of the jets of Fanaroff & Riley galaxies are
observed to produce extended non-thermal emission in a wide frequency range.
The study of these structures can provide valuable insights on the conditions
for particle acceleration and radiation at the shock fronts.We have studied the
thermal and non-thermal emission that can be expected from the jet termination
regions of Fanaroff & Riley type I sources. The broadband emission from these
galaxies has been recently extended to include the high-energy gamma-ray
domain, owing to the Fermi detection of Cen A lobes. Exploring the physics
behind the jet/medium interactions in FRI can provide valuable insights on the
conditions for particle acceleration and radiation in the jet termination
shocks. Making use of the results of a fully relativistic numerical simulation
code of the evolution of a FRI jet we model the expected radiative output and
predict spectra and lightcurves of both thermal and non-thermal emission at
different source ages.
