  Two-particle azimuthal ($\Delta\phi$) and pseudorapidity ($\Delta\eta$)
correlations using a trigger particle with large transverse momentum ($p_T$) in
$d$+Au, Cu+Cu and Au+Au collisions at $\sqrt{s_{{NN}}}$ =\xspace 62.4 GeV and
200~GeV from the STAR experiment at RHIC are presented. The \ns correlation is
separated into a jet-like component, narrow in both $\Delta\phi$ and
$\Delta\eta$, and the ridge, narrow in $\Delta\phi$ but broad in $\Delta\eta$.
Both components are studied as a function of collision centrality, and the
jet-like correlation is studied as a function of the trigger and associated
$p_T$. The behavior of the jet-like component is remarkably consistent for
different collision systems, suggesting it is produced by fragmentation. The
width of the jet-like correlation is found to increase with the system size.
The ridge, previously observed in Au+Au collisions at $\sqrt{s_{{NN}}}$ = 200
GeV, is also found in Cu+Cu collisions and in collisions at $\sqrt{s_{{NN}}}$
=\xspace 62.4 GeV, but is found to be substantially smaller at
$\sqrt{s_{{NN}}}$ =\xspace 62.4 GeV than at $\sqrt{s_{{NN}}}$ = 200 GeV for the
same average number of participants ($ \langle N_{\mathrm{part}}\rangle$).
Measurements of the ridge are compared to models.
