Re-examining the Too-Big-To-Fail Problem for Dark Matter Haloes with Central Density Cores

Abstract

Recent studies found the densities of dark matter (DM) subhaloes which surround nearby dwarf spheroidal galaxies (dSphs) to be significantly lower than those of the most massive subhaloes expected around Milky Way sized galaxies in cosmological simulations, the so called "too-big-to-fail" (TBTF) problem. A caveat of previous work has been that dark substructures were assumed to contain steep density cusps in the center of DM haloes even though the central density structure of DM haloes is still under debate. In this study, we re-examine the TBTF problem for models of DM density structure with cores or shallowed cusps. Our analysis demonstrates that the TBTF problem is alleviated as the logarithmic slope of the central cusp becomes shallower. We find that the TBTF problem is avoided if the central cusps of DM haloes surrounding dSphs are shallower than $r^{-0.6}$.

8 pages, 5 figures, accepted for publication in MNRAS

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• Mass models of gas-rich void dwarf galaxies
• Reducing cosmological small scale structure via a large dark matter-neutrino interaction: constraints and consequences
• Warm dark matter model with a few keV mass is bad for the too-big-to-fail problem
• Halo heating from fluctuating gas in a model dwarf