Torsten Bringmann, Fiorenza Donato, Roberto A. Lineros
It is well established that phenomenological two-zone diffusion models of the
galactic halo can very well reproduce cosmic-ray nuclear data and the observed
antiproton flux. Here, we consider lepton propagation in such models and
compute the expected galactic population of electrons, as well as the diffuse
synchrotron emission that results from their interaction with galactic magnetic
fields. We find models in agreement not only with cosmic ray data but also with
radio surveys at essentially all frequencies. Requiring such a globally
consistent description strongly disfavors very large ($L\gtrsim 15$ kpc) and,
even stronger, small ($L\lesssim 1$ kpc) effective diffusive halo sizes. This
has profound implications for, e.g., indirect dark matter searches.
View original:
http://arxiv.org/abs/1106.4821
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