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We present the latitude-normalized radial velocity (vb) distribution of 3318subsolar metallicity, V<13.5 stars from the Grid Giant Star Survey (GGSS) inSouthern Hemisphere fields. The sample includes giants mostly within ~5 kpcfrom the Galactic disks and halo. The nearby halo is found to (1) exhibitsignificant kinematical substructure, and (2) be prominently represented byseveral velocity coherent structures, including a very retrograde "cloud" ofstars at l~285 deg and extended, retrograde "streams" visible as relativelytight l-vb sequences. One sequence in the fourth Galactic quadrant lies withinthe l-vb space expected to contain tidal debris from the "star cluster"wCentauri. Not only does wCen lie precisely in this l-vb sequence, but thepositions and vb of member stars match those of N-body simulations of tidallydisrupting dwarf galaxies on orbits ending with wCen's current position andspace motion. But the ultimate proof that we have very likely found extendedparts of the wCen tidal stream comes from echelle spectroscopy of a subsampleof the stars that reveals a very particular chemical abundance signature knownto occur only in wCen. The newly discovered wCen debris accounts for almost allfourth Galactic quadrant retrograde stars in the southern GGSS, which suggestswCen is a dominant contributor of retrograde giant stars in the inner Galaxy.

the astrophysical journal. letters

Exploring Halo Substructure with Giant Stars: Substructure in the Local  Halo as Seen in the Grid Giant Star Survey Including Extended Tidal Debris  from Omega Centauri