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Flow coefficients $v_n$ for $n$ = 2, 3, 4, characterizing the anisotropiccollective flow in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV, arepresented. They indicate the expected growth of viscous damping for soundpropagation in the quark gluon plasma (QGP) produced in these collisions.Hydrodynamical model comparisons which include the effects of initial stategeometry fluctuations, highlight the role of higher harmonics ($v_{n, n>2}$) asa constraint for disentangling the effects of viscosity and initial conditions,and suggest a small specific viscosity for the QGP. This viscosity iscompatible with that obtained via a newly proposed technique\cite{Lacey:2011ug} which employs the relative magnitudes of $v_n$ to estimatethe viscosity, and the "viscous horizon" or length-scale which characterizesthe highest harmonic that survives viscous damping.

PHENIX Measurements of Higher-order Flow Harmonics in Au+Au collisions at Root_s = 200 GeV