A Kinematically Selected, Metal-poor Stellar Halo in the Outskirts of M31

@article{Chapman2006AKS,
  title={A Kinematically Selected, Metal-poor Stellar Halo in the Outskirts of M31},
  author={Scott C. Chapman and Rodrigo A. Ibata and Geraint F. Lewis and Annette M. N. Ferguson and Michael J. Irwin and Alan W. McConnachie and Nial R. Tanvir},
  journal={The Astrophysical Journal},
  year={2006},
  volume={653},
  pages={255 - 266}
}
We present evidence for a metal-poor, [Fe/H] ~ -1.4, σ = 0.2 dex, stellar halo component detectable at radii from 10 to 70 kpc, in our nearest giant spiral neighbor, the Andromeda galaxy. This metal-poor sample underlies the recently discovered extended rotating component and has no detected metallicity gradient. This discovery uses a large sample of 9861 radial velocities of red giant branch (RGB) stars obtained with the Keck II Telescope and DEIMOS spectrograph, with 827 stars with robust… 
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