Variation of the subhalo abundance in dark matter halos

Understand

We analyzed the statistics of subhalo abundance of galaxy-sized and giant-galaxy-sized halos formed in a high-resolution cosmological simulation of a 46.5Mpc cube with the uniform mass resolution of $10^6 M_{\odot}$.

• We analyzed all halos with mass more than $1.5 \times 10^{12}M_{\odot}$ formed in this simulation box.
• The total number of halos was 125.
• We found that the subhalo abundance, measured by the number of subhalos with maximum rotation velocity larger than 10% of that of the parent halo, shows large halo-to-halo variations.