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The ELUCID project aims to build a series of realistic cosmologicalsimulations that reproduce the spatial and mass distribution of the galaxies asobserved in the Sloan Digital Sky Survey (SDSS). This requires powerfulreconstruction techniques to create constrained initial conditions. We test thereconstruction method by applying it to several $N$-body simulations. We use 2medium resolution simulations from each of which three additional constrained$N$-body simulations were produced. We compare the resulting friend of friendcatalogs by using the particle indexes as tracers, and quantify the quality ofthe reconstruction by varying the main smoothing parameter. The crossidentification method we use proves to be efficient, and the results suggestthat the most massive reconstructed halos are effectively traced from the sameLagrangian regions in the initial conditions. Preliminary time dependenceanalysis indicates that high mass end halos converge only at a redshift closeto the reconstruction redshift. This suggests that, for earlier snapshots, onlycollections of progenitors may be effectively cross-identified.

astrophysical journal/the astrophysical journal

ELUCID -- Exploring the Local Universe with the reConstructed Initial  Density field. II: Reconstruction diagnostics, applied to numerical halo  catalogs