Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3702f&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #37.02; Bulletin of the American Astronomical Society, V
Other
Scientific paper
Four types of high-energy signals in the Milky Way have surprised us
in recent years: (1) EGRET observed GeV gamma-rays in excess of those
expected from simple Galactic models, (2) WMAP observed an apparent
hard synchrotron excess towards the inner Galaxy, (3) HEAT observed a
higher than expected positron/electron ratio near Earth at tens of
GeV, and (4) SPI observed a stronger 511 keV annihilation line in the
Galactic center than expected. Items (1) and (2) may be explained by
an extra (in additional to the "usual" shock-accelerated) population
of electrons (and positrons) in the inner Galaxy at 10s to 100s of
GeV, and (3) and (4) may be related to these. The necessary
population is a steady state solution (calculated using GALPROP to
simulate CR propagation and interaction with the interstellar medium)
for an injection function that could be provided by WIMP annihilation.
I will show that reasonable WIMP parameters can fit the data, given
some caveats. I will also give a scenario that could cascade this
population down to lower energies to produce (4), explain what other
observation consequences it would have, and show why it is unlikely.
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