  The stress-energy tensor of a quark moving through a strongly coupled N=4
supersymmetric Yang-Mills plasma is evaluated using gauge/string duality. The
accuracy with which the resulting wake, in position space, is reproduced by
hydrodynamics is examined. Remarkable agreement is found between hydrodynamics
and the complete result down to distances less than 2/T away from the quark. In
performing the gravitational analysis, we use a relatively simple formulation
of the bulk to boundary problem in which the linearized Einstein field
equations are fully decoupled. Our analysis easily generalizes to other sources
in the bulk.
