Stellar Stream Candidates in the Solar Neighborhood Found in the LAMOST
  DR3 and TGAS
  We have cross-matched the LAMOST DR3 with the Gaia DR1 TGAS catalogs and
obtained a sample of 166,827 stars with reliable kinematics. A technique based
on the wavelet transform was applied to detect significant overdensities in
velocity space among five subsamples divided by spatial position. In total, 16
significant overdensities of stars with very similar kinematics were
identified. Among these, four are new stream candidates and the rest are
previously known groups. Both the U-V velocity and metallicity distributions of
the local sample show a clear gap between the Hercules structure and the
Hyades-Pleiades structure. The U-V positions of these peaks shift with the
spatial position. Following a description of our analysis, we speculate on
possible origins of our stream candidates.
