  We study the energy-momentum deposited by fast moving partons within a medium
using linearized viscous hydrodynamics. The particle distribution produced by
this energy-momentum is computed using the Cooper-Frye formalism. We show that
for the conditions arising in heavy-ion collisions, energy momentum is
preferentially deposited along the head shock of the fast moving partons. We
also show that the double hump in the away-side of azimuthal correlations can
be produced by two (instead of one) away-side partons that deposit their
energy-momentum along their directions of motion. These partons are originated
in the in-medium hard scattering in 2 to 3 processes. We compare the results of
the analysis to azimuthal angular correlations from PHENIX and show that the
calculation reproduces the data systematics of a decreasing away-side
correlation when the momentum of the associated hadron becomes closer to the
momentum of the leading hadron. This scenario seems to avoid the shortcomings
of the Mach cone as the origin of the double-hump structure in the away-side
