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The PHENIX experiment has measured the dielectron continuum in sqrt{s_NN} =200 GeV Au+Au collisions. In minimum bias collisions the dielectron yield inthe mass range between 150 and 750 MeV/c^2 is enhanced by a factor of 3.4 +/-0.2(stat.) +/- 1.3(syst.) +/- 0.7(model) compared to the expectation from ourmodel of hadron decays. The integrated yield increases faster with thecentrality of the collisions than the number of participating nucleons,suggesting emission from scattering processes in the hot and dense medium. Thecontinuum yield between the masses of the phi and the J/psi mesons isconsistent with expectations from correlated c-cbar production, though othermechanisms are not ruled out.

Enhancement of the dielectron continuum in sqrt{s_NN} = 200 GeV Au+Au collisions