A giant stream of metal-rich stars in the halo of the galaxy M31

@article{Ibata2001AGS,
  title={A giant stream of metal-rich stars in the halo of the galaxy M31},
  author={Rodrigo A. Ibata and Michael Irwin and Geraint F. Lewis and Annette M. N. Ferguson and Nial Tanvir},
  journal={Nature},
  year={2001},
  volume={412},
  pages={49-52}
}
Recent observations have revealed streams of gas and stars in the halo of the Milky Way that are the debris from interactions between our Galaxy and some of its dwarf companion galaxies; the Sagittarius dwarf galaxy and the Magellanic clouds. Analysis of the material has shown that much of the halo is made up of cannibalized satellite galaxies, and that dark matter is distributed nearly spherically in the Milky Way. It remains unclear, however, whether cannibalized substructures are as common… 
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