Heavy flavor production from single muons in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV

Heavy flavor production in the dense partonic matter created at RHIC can be modified either by energy loss for heavy quarks or by charm enhancement. Measurement of open charm as a function of centrality will also be critical to interpreting the measured production of J/$\psi$ in Au+Au collisions, as J/$\psi$ production is predicted to be modified by both initial state and final state effects in Au+Au collisions. One way of measuring open charm is to look at single muons from semi-leptonic decays. The PHENIX experiment at RHIC is uniquely positioned to make this measurement using its two muon arms. Single muons from Au+Au collisions have to be extracted from a background of hadron punch throughs and muon decays from light mesons. We present the latest results of open charm from Au+Au collisions using the PHENIX muon arms (pseudorapidity range: $1.2 < |\eta| < 2.4$).