Submitting Campus

Daytona Beach


Physical Sciences

Document Type


Publication/Presentation Date



We have cross-matched the LAMOST DR3 with the Gaia DR1 TGAS cata- logs 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 sig- nificant 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 descrip- tion of our analysis, we speculate on possible origins of our stream candidates.

Publication Title

The Astrophysical journal



The Institute of Physics

Grant or Award Name

National Natural Science Foundation of China grant Nos. 11390371, 11233004, U1431106, 11573035, 11625313, National Key Basic Research Program of China (973 program) 2014CB845701 and 2014CB845703, US National Science Foundation (AST-1358787)