Radio data and synchrotron emission in consistent cosmic ray models

Details Radio data and synchrotron emission in consistent cosmic ray models Radio data and synchrotron emission in consistent cosmic ray models

2011-06-23

arxiv.org/abs/1106.4821v2

JCAP 1201, 049 (2012)

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

IOP style; 11 pages, 3 figures; considerably extended and updated discussion, matches the published version

Scientific paper

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.

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