Stellar Stream Candidates in the Solar Neighborhood Found in the LAMOST DR3 and TGAS

Abstract

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.

16 pages, 5 figures

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Cited by in corpus (10)

• Wide Binaries in Tycho-Gaia II: Metallicities, Abundances, and Prospects for Chemical Tagging
• Kinematic structures of the Solar neighbourhood revealed by Gaia DR1/TGAS and RAVE
• The substructures in the local stellar halo from Gaia and LAMOST
• High-Drag Interstellar Objects And Galactic Dynamical Streams
• Revisit of open clusters UPK 39, UPK 41 and PHOC 39 : a new binary open cluster found
• Revisit NGC 5466 Tidal Stream with $Gaia$, SDSS/SEGUE and LAMOST
• Existence of Tidal Tails for the Globular Cluster NGC 5824
• A New Cold Stream near the Southern Galactic Pole
• A Dwarf Galaxy Debris Stream Associated with Palomar 1 and the Anticenter Stream
• Moving Groups in the Solar Neighborhood with Gaia, APOGEE, GALAH, and LAMOST: Dynamical Effects Gather Gas and the Ensuing Star Formation Plays an Important Role in Shaping the Stellar Velocity Distributions