  We use the AdS/CFT correspondence to compute the energy radiated by an
infinitely massive half-BPS particle charged under N=4 SU(N) SYM, transforming
in the symmetric or antisymmetric representation of the gauge group, and moving
in the vacuum, to all orders in 1/N and for large 't Hooft coupling. For the
antisymmetric case we consider D5-branes reaching the boundary of AdS_5 at
arbitrary timelike trajectories, while for the symmetric case, we consider a
D3-brane in AdS_5 that reaches the boundary at a hyperbola. This D3-brane
solution is the analytic continuation of the one previously used to compute the
expectation value of a circular Wilson loop. We compare our results to the one
obtained for the fundamental representation by Mikhailov, obtained by
considering a string in AdS_5.
