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It is well known from the Butcher-Oemler effect that galaxies in denseenvironment are mostly red with little star formation and the fraction of bluegalaxies in galaxy groups/clusters also declines rapidly with redshifts. Arecent work by Hashimoto et al. reported a local 'blue cluster' with highfraction of blue galaxies ($\sim 0.57$), higher than the model predictions.They ascribed this blue cluster to the feeding of gas along a filamentarystructure around the cluster. In this work we use group catalog from the SloanDigital Sky Survey Data Release 7 (SDSS DR7) and the state-of-art ofsemi-analytic model (SAM) to investigate the formation of blue clusters inlocal Universe. In total, we find four blue clusters with halo mass $\sim10^{14}M_{\odot}$ at $0.02 < z < 0.082$, while only the one found by Hashimotoet al. is in a filamentary structure. The SAM predicts that blue clusters havelater formation time and most blue satellite galaxies are recently accreted. Weconclude that the formation of blue clusters is mainly governed by newlyaccreted blue satellites, rather than the effect of large-scale environment.

The formation of blue cluster in local Universe