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We use an improved wavelet analysis technique to reconstruct the $(U,V,W)$velocity distribution for $\sim 250000$ stars from Gaia DR2, residing in thesolar neighborhood of $200$~pc. The 2D wavelet transforms for three bivariatedistributions $(U,V)$, $(U,W)$, and $(V,W)$ were investigated. Though most ofcurrently known (low-velocity) stellar moving groups are densely overlapped inthese diagrams, our analysis allowed to detect and disentangle about twentystatistically significant 3D groups of stars with high velocities. Most of themappear new. We also discuss the issue of correct noise thresholding in thewavelet transform and highlight the importance of using a global rather thanlocal statistic for that. Using of a local significance measure may lead to anoverstated statistical confidence for individual patterns due to the effect ofmultiple testing.

High-velocity moving groups in the Solar neighborhood in Gaia DR2