  We present observations made with the VLA at 1.5 and 8.4 GHz of the nearby
FRI radio galaxy 3C296. The most recent models of FRI radio galaxies suggest
that substantial deceleration must take place in their jets, with strongly
relativistic velocities on parsec scales giving place to at most mildly
relativistic velocities on scales of tens of kiloparsecs. The region over which
this deceleration takes place is therefore of considerable interest. By
considering the side-to-side asymmetries of the jets of 3C296, we constrain the
region of strong deceleration in the source. Our observations show evidence
that the jets have slow edges surrounding faster central spines. We discuss the
implications of our observations for models of the magnetic field structure in
these objects.

Astrophysics