Bullet Clusters in the MareNostrum Universe

Understand

We estimate the expected distribution of displacements between the dark matter and gas cores in simulated clusters.

• We use the MareNostrum Universe, one of the largest non radiative, SPH Lambda CDM cosmological simulations.
• We find that projected 2-D displacements between dark matter and gas, equal or larger than the observed in the Bullet Cluster, are expected in 1% to 2% of the clusters with masses larger than 10^{14} Msun.
• The 2-D displacement distribution is roughly the same between redshifts 0<z<0.5 when multiplied by a factor of (1+z)^{-1/2}.