Evidences against cuspy dark matter halos in large galaxies

Understand

We develop and apply new techniques in order to uncover galaxy rotation curves (RC) systematics.

• Considering that an ideal dark matter (DM) profile should yield RCs that have no bias towards any particular radius, we find that the Burkert DM profile satisfies the test, while the Navarro-Frenk-While (NFW) profile has a tendency of better fitting the region between one and two disc scale lengths than the inner disc scale length region.
• Our sample indicates that this behaviour happens to more than 75% of the galaxies fitted with an NFW halo.
• Also, this tendency does not weaken by considering "large" galaxies, for instance those with $M_*\gtrsim 10^{10} M_\odot$.