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Recently we have shown that the centrality dependence of the multiplicity ofdifferent hadron species observed in RHIC and SPS experiments can be wellunderstood in a simple model, dubbed core-corona model. There it is assumedthat those incoming nucleons which scatter only once produce hadrons as in ppcollisions whereas those which scatter more often form an equilibrated sourcewhich decays according to phase space. In this article we show that alsokinematical variables like $v_2/\epsilon_{part} (N_{part})$ as well as$v_2^i/\epsilon_{part} (N_{part})$ and $<p_T^i (N_{part})>$ of identifiedparticles are well described in this model. The correlation of $<p_T^i>$between peripheral heavy ion collisions and pp collisions for differenthadrons, reproduced in this model, questions whether hydrodynamicalcalculations are the proper tool to describe non-central heavy ion collision.The model explains as well the centrality dependence of $v_2/\epsilon_{part}$of charged particles, considered up to now as an observable which allows todetermine the viscosity of the quark gluon plasma. The observed dependence of$v_2^i/\epsilon_{part}(N_{part})$ on the particle species is a simpleconsequence of the different ratios of core to corona particles.

Is the centrality dependence of the elliptic flow $v_2$ and of the average $$ in RHIC experiments more than a Core-Corona Effect?