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Direct photon spectra from central Au+Au- and Cu+Cu-collisions at sqrt(s_NN)= 62.4, 130 and 200 AGeV are calculated within the microscopic transport modelUrQMD and a micro+macro hybrid model. In the latter approach, the high-densitypart of the transport evolution is replaced by an ideal 3+1-dimensionalhydrodynamic calculation. We study the impact of viscosity and full localthermalization and compare the calculations to measurements obtained by thePHENIX collaboration. We find a reasonable agreement with the experimental datafor calculations involving a Quark-Gluon-Plasma phase.

Direct photon calculations in heavy-ion collisions at s(NN)**1/2 = 62.4 - 200 AGeV in a (3+1) dimensional hybrid approach