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- W2079423695 abstract "Numerical simulations of Milky Way-size cold dark matter (CDM) halos predict a steeply rising mass function of small dark matter subhalos and a substructure count that greatly outnumbers the observed satellites of the Milky Way. Several proposed explanations exist, but detailed comparison between theory and observation in terms of the maximum circular velocity (Vmax) of the subhalos is hampered by the fact that Vmax for satellite halos is poorly constrained. We present comprehensive mass models for the well-known Milky Way dwarf satellites and derive likelihood functions to show that their masses within 0.6 kpc (M0.6) are strongly constrained by the present data. We show that the M0.6 mass function of luminous satellite halos is flat between ~107 and 108 M☉. We use the Via Lactea N-body simulation to show that the M0.6 mass function of CDM subhalos is steeply rising over this range. We rule out the hypothesis that the 11 well-known satellites of the Milky Way are hosted by the 11 most massive subhalos. We show that models where the brightest satellites correspond to the earliest forming subhalos or the most massive accreted objects both reproduce the observed mass function. A similar analysis with the newly discovered dwarf satellites will further test these scenarios and provide powerful constraints on the CDM small-scale power spectrum and warm dark matter models." @default.
- W2079423695 created "2016-06-24" @default.
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- W2079423695 date "2007-11-10" @default.
- W2079423695 modified "2023-10-17" @default.
- W2079423695 title "Redefining the Missing Satellites Problem" @default.
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- W2079423695 doi "https://doi.org/10.1086/521914" @default.
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