Combined test of the UCM isothermal dark matter halo profile against SPARC (150 galaxies, Li et al. 2020) and LITTLE THINGS (26 dwarf irregulars, Oh et al. 2015) — two entirely independent HI surveys with different telescopes, reduction pipelines, and mass-modelling codes. Combined result: median χ² = 0.71 over 176 galaxies, 72% with χ² < 2. LITTLE THINGS dwarf galaxies fit marginally better (median χ² = 0.57), consistent with the UCM prediction that sub-threshold equilibrium is most accurate in the low-mass, feedback-free regime.
Norbert Prebeck (Fri,) studied this question.
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