Signatures of Dark Matter Halo Expansion in Galaxy Populations

摘要: Dark matter cores within galaxy haloes can be formed by energy feedback from star forming regions: an balance suggests that the maximum core formation efficiency arises in galaxies with M$_{\star}\sim10^{8.5}$M$_{\odot}$. We show a model population of galaxies, which density profile has been modified such baryonic feedback, is able to explain observed velocity function and Tully-Fisher relations significantly better than universal cuspy assumed. Alternative models, namely warm or self-interacting dark matter, also provide match these does, but make different predictions for how halo profiles vary mass compared case. propose mechanisms may distinguished based on imprint they leave populations over wide range mass. Within current observational data we find evidence expected signatures dependence generated feedback.