Two-particle correlations on transverse rapidity and the momentum dependence of angular correlation features in Au+Au collisions at $\sqrt{s_{NN}} = 200$ GeV at STAR

Two-particle 2D correlations on transverse rapidity $y_t$ from Au+Au collisions at STAR will be presented. The correlations are formed from charged particles with $p_t \geq 0.15$ GeV/c, $|\eta| \leq 1$, and $2\pi$ azimuth. A peak in transverse rapidity correlations around ($y_t,y_t$) = (3,3) ($p_t$ = 1.4 GeV/c) is observed and remains at approximately the same position from peripheral to most central collisions. Pairs distinguished by charge combination and small versus large relative azimuth angles will also be presented. A peak in ``back-to-back'' pairs around ($y_t,y_t$)=(3,3) persists even in more central collisions remaining at approximately the same $y_t$. To study how pairs correlated in the ($y_t,y_t$) peak contribute to correlation features in relative pseudorapidity $\eta_{\Delta}$ and azimuth $\phi_{\Delta}$, a new cut scheme was implemented consisting of 28 distinct momentum ranges. The ($y_t,y_t$) distribution of particles producing the angular correlation structures associated with minimum bias jets will be presented. Interestingly, these results show that the extended correlation on relative $\eta$ commonly referred to as the ``ridge'' is not softer relative to the minijet peak near the origin and is harder than the inclusive spectra.