Navarro-Frenk-White dark matter profile and the dark halos around disk systems

Understand

The $\Lambda$ cold dark matter ($\Lambda$CDM) scenario well describes the Universe at large scales, but shows some serious difficulties at small scales: the inner dark matter (DM) density profiles of spiral galaxies generally appear to be cored, without the $r^{-1}$ predicted by N-body simulations in the above scenario.

• In a more physical context, the baryons in the galaxy might backreact and erase the original cusp through supernova explosions.
• Before that this effect be investigated, it is important to determine how wide and frequent the discrepancy between observed and N-body predicted profiles is and what its features are.
• We used more than 3200 quite extended rotation curves (RCs) of good quality and high resolution of disk systems.