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Fig. 3


Effective self-annihilation cross section  ⟨ σv ⟩ eff required for a moderately extended, faint Fermi-LAT source to originate from a DM subhalo of mass M. Assumed source parameters are φ(10−100   GeV) = 1.6 × 10-10   cm-2   s-1, an intrinsic extent θs = 1° (θ68 ≈ 0.5°), and the Galactic position (l,b) = (114°, −55°). The dashed blue and solid red lines indicate the average prediction considering the FHM and SHM, respectively. The intrinsic SHM scatter is shown by the red-shaded area and the dotted red lines. The left panel depicts WIMPs of mχ = 500   GeV totally annihilating in , while the right panel considers mχ = 150   GeV with total annihilation in τ+τ − . Current contraints on  ⟨ σv ⟩ eff from Papucci & Strumia (2010) (grey-shaded) and Abazajian et al. (2010) (light grey-shaded) are plotted in combination with the expectation from thermal freeze-out (blue-shaded).

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