SIMBAD references

We have measured the absolute proper motion of the candidate Canis Major dwarf galaxy (CMa), at (l,b)=(240°,-8°). Likely main-sequence stars in CMa have been selected from a region in the color-magnitude diagram that has very little contamination from known Milky Way components. We obtain µ_lcosb=-1.47±0.37 and µ_b=-1.07±0.38 mas/yr, on the International Celestial Reference System by means of Hipparcos stars. Together with the radial velocity of 109 km/s and the assumed distance of 8 kpc, these results imply a space motion of (Π,Θ,W)=(-5±12, 188±10, -49±15) km/s. While CMa has in-plane rotation similar to the mean of thick-disk stars, it shows significant (3 σ) motion perpendicular to the disk and differs even more (7 σ) from that expected for the Galactic warp. The W-velocity lends support to the argument that the CMa overdensity is part of a satellite-galaxy remnant.