  Angular di-hadron correlations reveal novel structures in central Au+Au
collisions at $\sqrt{S_{NN}}$ = 200 GeV. One of them, known as the ridge, is
elongated in pseudo rapidity and peaks on the near side ($\Delta\phi$ $\approx$
0). Investigating the origin of the ridge structure helps to understand the hot
dense matter that is created in ultra relativistic heavy ion collisions.
Results showing the $<$$p_{T}$$>$ dependence of the ridge structure are
presented. Evidence for possible jet and non-jet contributions to the ridge
structure will be discussed.
