Speaker
Dr
Torsten Bringmann
(University Hamburg)
Description
It is well established that even very simple phenomenological two-zone diffusion
models of the galactic halo can reproduce cosmic-ray nuclear data, and the observed
antiproton flux, surprisingly well. 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 that are consistent not only with cosmic ray data
but also with radio surveys at essentially all frequencies. Requiring such a globally
consistent description of seemingly unrelated galactic phenomena strongly disfavors
both very large (L > 15 kpc) and small (L<= 1 kpc) values for the effective size of
the diffusive halo. This has profound implications for, e.g., indirect dark matter
searches.
Primary author
Dr
Torsten Bringmann
(University Hamburg)
