Three Moving Groups Detected in the LAMOST DR1 Archive
  We analyze the kinematics of thick disk and halo stars observed by the Large
sky Area Multi-Object Fiber Spectroscopic Telescope. We have constructed a
sample of 7,993 F, G and K nearby main-sequence stars (\textit{d} $<$ 2 kpc)
with estimates of position (x, y, z) and space velocity ($U$, $V$, $W$) based
on color and proper motion from the SDSS DR9 catalog. Three `phase-space
overdensities' are identified in [\textit{V}, $\sqrt{U^{2}+2V^{2}}$] with
significance levels of $\sigma$ $>$ 3. %[L$_{Z}$, eccentricity], [L$_{Z}$,
L$_{\bot}$], and [V$_{az}$, V$_{\triangle}E$].
  Two of them (Hyades-Pleiades stream, Arcturus-AF06 stream) have been
identified previously. We also find evidence for a new stream (centered at
\textit{V} $\sim$ -180 km s$^{-1}$) in the halo. The formation mechanisms of
these three streams are analyzed. Our results support the hypothesis the
Arcturus-AF06 stream and the new stream originated from the debris of a
disrupted satellite, while Hyades-Pleiades stream has a dynamical origin.
