A Critical Reevaluation of Radio Constraints on Annihilating Dark Matter [HEAP]


A number of groups have employed radio observations of the Galactic Center to derive stringent constraints on annihilating dark matter. In this letter, we show that electron energy losses in this region are likely to be dominated by inverse Compton scattering on the interstellar radiation field, rather than by synchrotron, relaxing the resulting constraints considerably. Strong convective winds, which are well motivated by recent observations, may also significantly weaken synchrotron constraints. After taking these factors into account, we find that radio constraints on annihilating dark matter are orders of magnitude less stringent than previously reported, and are generally weaker than those derived from current gamma-ray observations.

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I. Cholis, D. Hooper and T. Linden
Wed, 27 Aug 14

Comments: 5 pages, 3 Figures