Bimodal Formation Time Distribution for Infall Dark Matter Halos

  title={Bimodal Formation Time Distribution for Infall Dark Matter Halos},
  author={Jingjing Shi and Huiyuan Wang and H. J. Mo and Lizhi Xie and Xiaoyu Wang and Andrea Lapi and Ravi K. Sheth},
  journal={The Astrophysical Journal},
We use a 200 a-side N-body simulation to study the mass accretion history (MAH) of dark matter halos to be accreted by larger halos, which we call infall halos. We define a quantity to characterize the MAH of infall halos, where and are the accretion and formation redshifts, respectively. We find that, at given , their MAH is bimodal. Infall halos are dominated by a young population at high redshift and by an old population at low redshift. For the young population, the distribution is narrow… 
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