Galactic Signatures of Decaying Dark Matter

Details Galactic Signatures of Decaying Dark Matter Galactic Signatures of Decaying Dark Matter

2009-05-29

arxiv.org/abs/0905.4952v3

JCAP 0909:012,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

32 pages, 10 figures; Published version; Propagation models updated

Scientific paper

10.1088/1475-7516/2009/09/012

If dark matter decays into electrons and positrons, it can affect Galactic radio emissions and the local cosmic ray fluxes. We propose a new, more general analysis of constraints on dark matter. The constraints can be obtained for any decaying dark matter model by convolving the specific dark matter decay spectrum with a response function. We derive this response function from full-sky radio surveys at 408 MHz, 1.42 GHz and 23 GHz, as well as from the positron flux recently reported by PAMELA. We discuss the influence of astrophysical uncertainties on the response function, such as from propagation and from the profiles of the dark matter and the Galactic magnetic field. As an application, we find that some widely used dark matter decay scenarios can be ruled out under modest assumptions.

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