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Fig. 3.

image

Constraints on the dark-matter density profile of Eridanus 2 in the microphysical parametrization, assuming SIDM, found using CJAM and MultiNest. Units are omitted for clarity. The parameters are the characteristic dark-matter density (ρ0) in M kpc−3, the scale radius (rs) in kpc, the effective self-interaction coefficient (fΓ) in cm3 s−1 eV−1c2, and the systemic velocity (v0) in km s−1. The contours correspond to 0.5σ, 1.0σ, 1.5σ, and 2.0σ confidence levels, where σ is the standard deviation of a two-dimensional normal distribution. The vertical dashed lines in the one-dimensional histograms indicate the median and the 68% confidence interval (without arrows) or the 68% and 95% confidence limits (upper and lower arrows, respectively).

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