On the stellar velocity distribution in the solar neighborhood in the
  light of Gaia DR2
  The aim of this work is to contribute to the understanding of the stellar
velocity distribution in the solar neighborhood (SN). We propose that the
structures on the $U-V$ planes, known as the moving groups, can be mainly
explained by the spiral arms perturbations. The applied model of the Galactic
disk and spiral arms, with the parameters defined by observational data and
with pattern speed $\Omega_p=$28.0 km s$^{-1}$ kpc$^{-1}$, is the same that
allowed us to explain the origin of the Local Arm and the Sun's orbit trapped
inside the corotation resonance (CR). We show that the $U-V$ picture of the SN
consists of the main component, associated with the CR, and the inner and outer
structures, which we could associate with the Hercules and Sirius streams,
respectively. The Coma-Berenices and Hyades-Pleiades groups and the Sun itself
belong to the main part. The substructures of Hercules are formed mainly by the
nearby 8/1, 12/1, and even 6/1 inner Lindblad resonances, while Sirius is
shaped by the bulk of overlapping outer Lindblad resonances, -8/1, -12/1,
-16/1, which are stuck to the CR. This richness in resonances only exists near
corotation, which should be of the spiral arms, not of the Galactic bar, whose
stable corotation zone is far away from the Sun. The model's predictions of the
velocity distribution match qualitatively and quantitatively the distribution
provided by Gaia DR2.
