Too Big To Fail in Light of Gaia

Abstract

We point out an anti-correlation between the central dark matter (DM) densities of the bright Milky Way dwarf spheroidal galaxies (dSphs) and their orbital pericenter distances inferred from Gaia data. The dSphs that have not come close to the Milky Way center (like Fornax, Carina and Sextans) are less dense in DM than those that have come closer (like Draco and Ursa Minor). The same anti-correlation cannot be inferred for the ultra-faint dSphs due to large scatter. Including ultra-faints, a trend that dSphs with more extended stellar distributions tend to have lower DM densities emerges. A fresh look at solutions to the too-big-to-fail problem is warranted in light of these observations.

arXiv comment14 pages, 9 figures, 1 table. Figures in v1 updated. Revised version published in MNRAS

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