Scaling laws and luminosity segregation

We debate how the scaling properties of the angular correlation function w( theta) depend on luminosity segregation. Under the approximation that there is no deviation from Euclidean geometry and no evolution, we find that the scaling with catalog depth (D-*) is the same both for a luminosity (L) ind ependent clustering length (r(0)) and for a generic dependence of r(0) on L . Recent angular data, however, extend to depths where the above approximat ion is unsuitable and the simple scaling w proportional to D-*(-gamma) shou ld be modified. We find that such modifications depend on the shape of the L-dependence of r(0) and are indeed different depending on whether luminosi ty segregation is or is not considered. In particular, we find that a lumin osity segregation as observed at z = 0 causes effects of the same order as varying the rate of clustering evolution. For the sake of example, we apply our expressions to available angular galaxy data in the B- and R-bands and show that significant constraints on the evolution of clustering can alrea dy be found with public data.