Radio halo spectrum of Coma and the predictions of DM models calculated by assuming B0 = 4.7 μG and B(r) ∝ nth(r)0.5; black lines refer to Mχ = 9 GeV with (solid line; σV = 6.0 × 10-25 cm3 s-1) and τ ± (dashed line; σV = 1.4 × 10-25 cm3 s-1); red lines refer to Mχ = 60 GeV with (solid line; σV = 1.0 × 10-24 cm3 s-1) and τ ± (dashed line; σV = 9.0 × 10-25 cm3 s-1); blue lines refer to Mχ = 500 GeV with (solid line; σV = 7.5 × 10-24 cm3 s-1), τ ± (dashed line; σV = 3.0 × 10-23 cm3 s-1) and W ± (dotted line; σV = 1.1 × 10-23 cm3 s-1). The results are obtained using NFW smooth DM profiles, without considering the effect of substructures.
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