  Measurements of two particle azimuthal correlations in relativistic heavy ion
collisions are useful tools to dissect the interplay between hard-scattered
partons and hot dense medium. Correlations with trigger particle selection
relative to second order event plane are sensitive to the path-length
dependence of parton energy loss and to the influence of the medium on jet for
high and intermediate transverse momenta pairs, respectively. To study the
parton-medium coupling, it is also crucial to obtain correlations with
rejection of contributions from higher harmonic flow. We present current
results of second order event plane dependent correlations as well as
correlations in which contributions from higher harmonic flow have been
excluded in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV measured by PHENIX.
