The colours of satellite galaxies in the Illustris simulation

  title={The colours of satellite galaxies in the Illustris simulation},
  author={Laura V. Sales and Mark Vogelsberger and Shy Genel and Paul Torrey and Dylan Nelson and Vicente Rodriguez-Gomez and Wenting Wang and Annalisa Pillepich and Debora Sijacki and Volker Springel and Lars Hernquist},
  journal={Monthly Notices of the Royal Astronomical Society},
Observationally, the fraction of blue satellite galaxies decreases steeply with host halo mass, and their radial distribution around central galaxies is significantly shallower in massive (M* ≥ 1011 M⊙) than in Milky Way-like systems. Theoretical models, based primarily on semi-analytical techniques, have had a long-standing problem with reproducing these trends, instead predicting too few blue satellites in general but also estimating a radial distribution that is too shallow, regardless of… 

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