Accretion of galaxy groups into galaxy clusters

  title={Accretion of galaxy groups into galaxy clusters},
  author={Jos{\'e} A Benavides and Laura V. Sales and Mario G. Abadi},
  journal={Monthly Notices of the Royal Astronomical Society},
We study the role of group infall in the assembly and dynamics of galaxy clusters in $\Lambda$CDM. We select $10$ clusters with virial mass $M_{\rm 200} \sim 10^{14} \, M_{\odot}$ from the cosmological hydrodynamical simulation Illustris and follow their galaxies with stellar mass $M_{\star} \geq 1.5 \times 10^8 \, M_{\odot}$. A median of $\sim 38\%$ of surviving galaxies at $z=0$ are accreted as part of groups and did not infall directly from the field, albeit with significant cluster-to… 
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