$J/\Psi$ production at forward rapidity in $\sqrt{s_{NN}}$=200 GeV Au-Au collisions in PHENIX experiment

The modification of heavy quarkonium yields and spectra is considered one of the most promising signatures of the predicted nuclear phase transition into the deconfined quark- gluon plasma. During RHIC run 4, the PHENIX muon spectrometers, covering $1.2 < \eta < 2.4$ and $-1.2 < \eta < -2.2$, yielded several thousands of $J/\Psi$ particles in Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV. The $R_{AA}$ dependence over centrality, $p_T$ and rapidity will be presented using the $J/ \psi$ production via $\mu^{+}\mu^{-}$ channel.