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- W2922188800 endingPage "3" @default.
- W2922188800 startingPage "3" @default.
- W2922188800 abstract "We use the distribution of accreted stars in SDSS-Gaia DR2 to demonstrate that a non-trivial fraction of the dark matter halo within Galactocentric radii of 7.5-10 kpc and $|z| > 2.5$ kpc is in substructure, and thus may not be in equilibrium. Using a mixture likelihood analysis, we separate the contributions of an old, isotropic stellar halo and a younger anisotropic population. The latter dominates and is uniform within the region studied. It can be explained as the tidal debris of a disrupted massive satellite on a highly radial orbit, and is consistent with mounting evidence from recent studies. Simulations that track the tidal debris from such mergers find that the dark matter traces the kinematics of its stellar counterpart. If so, our results indicate that a component of the nearby dark matter halo that is sourced by luminous satellites is in kinematic substructure referred to as debris flow. These results challenge the Standard Halo Model, which is discrepant with the distribution recovered from the stellar data, and have important ramifications for the interpretation of direct detection experiments." @default.
- W2922188800 created "2019-03-22" @default.
- W2922188800 creator A5007260627 @default.
- W2922188800 creator A5015553898 @default.
- W2922188800 creator A5057141836 @default.
- W2922188800 date "2019-03-15" @default.
- W2922188800 modified "2023-10-11" @default.
- W2922188800 title "Inferred Evidence for Dark Matter Kinematic Substructure with SDSS–<i>Gaia</i>" @default.
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