The origin and evolution of fast and slow rotators in the Illustris simulation

  title={The origin and evolution of fast and slow rotators in the Illustris simulation},
  author={Zephyr Penoyre and Benjamin P Moster and Debora Sijacki and Shy Genel},
  journal={Monthly Notices of the Royal Astronomical Society},
Using the Illustris simulation, we follow thousands of elliptical galaxies back in time to identify how the dichotomy between fast-and slow-rotating ellipticals (FRs and SRs) develops. Comparing to the ATLAS(3D) survey, we show that Illustris reproduces similar elliptical galaxy rotation properties, quantified by the degree of ordered rotation, lambda(R). There is a clear segregation between low-mass (M-* 10(11.5) M-circle dot), which are mostly SRs, in agreement with observations. We find that… 
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