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One of the most striking results is the large elliptic flow ($v_2$) at RHIC.Detailed mass and transverse momentum dependence of elliptic flow are welldescribed by ideal hydrodynamic calculations for $p_{\mathrm{T}} < $ 1 GeV/c,and by parton coalescence/recombination picture for $p_{\mathrm{T}} = 2 - 6$GeV/c. The systematic error on $v_2$ is dominated by so-called "non-floweffects", which is the correlation not originated from reaction plane. It iscrucial to understand and reduce the systematic error from non-flow effects inorder to understand the underlying collision dynamics. In this paper, wepresent the centrality dependence of $v_2$ with respect to the first harmonicevent plane at ZDC-SMD ($v_2$\{ZDC-SMD\}) in Au + Au collisions at$\sqrt{s_{NN}}$ = 200 GeV. Large rapidity gap ($|\Delta\eta| > 6$) betweenmidrapidity and the ZDC could enable us to minimize possible non-flowcontributions. We compare the results of $v_2$\{ZDC-SMD\} with $v_2$\{BBC\},which is measured by event plane determined at $|\eta| = 3.1 - 3.9$. Possiblenon-flow contributions in those results will be discussed.

Centrality dependence of v2 in Au + Au at sqrt{s_NN} = 200 GeV