Radio halo spectrum of Coma and the best fits of three DM models with Mχ = 9 GeV (upper panel) for (solid with σV = 1.7 × 10-25 cm3 s-1 and B0 = 20 μG) and τ ± (dashed with σV = 5.6 × 10-25 cm3 s-1 and B0 = 2.2 μG), Mχ = 60 GeV (mid panel) for (solid with σV = 8.5 × 10-23 cm3 s-1 and B0 = 0.5 μG) and τ ± (dashed with σV = 9.0 × 10-22 cm3 s-1 and B0 = 0.1 μG), and with Mχ = 500 GeV (lower panel) with (solid with σV = 2.0 × 10-18 cm3 s-1 and B0 = 0.01 μG), τ ± (dashed with σV = 1.9 × 10-17 cm3 s-1 and B0 = 0.002 μG) and W± (dotted with σV = 1.3 × 10-16 cm3 s-1 and B0 = 0.001 μG). Data from Thierbach et al. (2003). The results are obtained using B(r) ∝ nth(r) and NFW smooth DM profiles, without considering the effect of substructures.
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