Mass and Redshift Dependence of Dark Halo Structure

  title={Mass and Redshift Dependence of Dark Halo Structure},
  author={D. H. Zhao and Y. P. Jing and H. J. Mo and Gerhard Boerner},
  journal={The Astrophysical Journal Letters},
  pages={L9 - L12}
Using a combination of N-body simulations with different resolutions, we study in detail how the concentrations of cold dark matter halos depend on halo mass at different redshifts. We confirm that halo concentrations at the present time depend strongly on halo mass, but our results also show marked differences from the predictions of some early empirical models. Our main results are that the mass dependence of the concentrations becomes weaker at higher redshifts and that at z ≳ 3, halos of… 
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