Centrality dependence of charged particle multiplicity at midrapidity in Au+Au collisions at sqrt[SNN]=130 GeV

We present a measurement of the pseudorapidity density of primary charged particles near midrapidity in Au+Au collisions at $\\sqrt{{s}_{\\mathrm{NN}}}=130 \\mathrm{GeV}$ as a function of the number of participating nucleons. The pseudorapidity density, ${\\mathrm{dN}}_{\\mathrm{ch}}/d\\ensuremath{\\eta}{|}_{|\\ensuremath{\\eta}|l1}/(\\frac{1}{2}〈{N}_{\\mathrm{part}}〉),$ rises from $2.87\\ifmmode\\pm\\else\\textpm\\fi{}0.21$ in peripheral events $(〈{N}_{\\mathrm{part}}〉\\ensuremath{\\sim}83)$ to $3.45\\ifmmode\\pm\\else\\textpm\\fi{}0.18$ in central events $(〈{N}_{\\mathrm{part}}〉\\ensuremath{\\sim}353),$ which is $53\\ifmmode\\pm\\else\\textpm\\fi{}8%$ higher than $p\\overline{p}$ collisions at a similar center-of-mass energy. This is consistent with an additional contribution to charged particle production that scales with the number of binary nucleon-nucleon collisions ${(N}_{\\mathrm{coll}}).$