  First measurements of charge-independent correlations on angular difference
variables $\eta_1 - \eta_2$ (pseudorapidity) and $\phi_1 - \phi_2$ (azimuth)
are presented for primary charged hadrons with transverse momentum $0.15 \leq
p_t \leq 2$ GeV/$c$ and $|\eta| \leq 1.3$ from Au-Au collisions at
$\sqrt{s_{NN}} = 130$ GeV. Strong charge-independent angular correlations are
observed associated with jet-like structures and elliptic flow. The width of
the jet-like peak on $\eta_1 - \eta_2$ increases by a factor 2.3 from
peripheral to central collisions, suggesting strong coupling of semi-hard
scattered partons to a longitudinally-expanding medium. New methods of jet
analysis introduced here provide evidence for nonperturbative QCD medium
effects in heavy ion collisions.
