Julio F. Navarro

TL;DR: In this paper, the authors used cosmological gas-dynamic simulations to investigate the accuracy of galaxy cluster mass estimates based on X-ray observations, and they found that the estimated-to-true mass ratio, derived from 174 artificial images constructed from the simulations, is nearly unbiased and has a standard deviation of 14{percent}{endash}29{percent.

TL;DR: In this paper, the authors used the Millennium Simulation (MS) to study the statistics of LCDM halo concentrations at z = 0.5, and found that the average halo concentration declines monotonically with mass; a power-law fits well the concentration-mass relation for over 3 decades in mass, up to the most massive objects to form in a LCDM universe.

TL;DR: In this paper, the authors used high-resolution N-body simulations to study the equilibrium density profiles of dark matter halos in hierarchically clustering universes, and they found that all such profiles have the same shape, independent of halo mass, of initial density fluctuation spectrum, and of the values of the cosmological parameters.

TL;DR: A panorama of galaxy structure of the Andromeda galaxy (M31) is reported, which directly confirms the basic tenets of the hierarchical galaxy formation model and reveals the shared history of M31 and M33 in the unceasing build-up of galaxies.

TL;DR: In this article, the authors use N-body simulations to investigate the structure of dark halos in the standard Cold Dark Matter cosmogony, and they find that the density of a halo correlates strongly with the halo mass.