The substructures in the local stellar halo from Gaia and LAMOST
  Based on the second Gaia data release (Gaia DR2) and spectroscopy from the
Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data, we
identified 20,089 halo stars kinematically and chemically. The halo streams in
the solar neighborhood could be detected in the space of energy and angular
momentum. We reshuffle the velocities of these stars to determine the
significance of substructure. Finally, we identify 4 statistically significant
substructures that are labeled GL-1 through 4. Among these substructures, GL-1
is previously known stream ("N2" stream) and the rest 3 substructures are new.
These substructures may be the debris of dwarf galaxies accretion event, their
dynamical and chemical information can help to understand the history of the
Milky Way.
