  The energy and momentum lost by a hard parton propagating through hot and
dense matter has to be redistributed in the nuclear medium. Apart from heating
the medium, there is the possibility that collective modes are excited. We
outline a formalism that can be used to track the propagation of such a mode
through the evolving medium if its dispersion relation is known. Under the
assumption that a sound wave is created, we track the jet energy loss as a
function of spacetime and follow the resulting mach cone throughout the
fireball evolution.We compare with the angular correlation pattern of hard
hadrons as obtained by the PHENIX collaboration and find good agreement with
the data provided that a substantial fraction of jet energy ($\sim$ 90%) is
deposited into a propagating mode and that the hot matter can be characterized
by an EOS with a soft point (not necessarily a mixed phase).
