Astrophysics Colloquium by Christoph Weniger (Max-Planck-Institut für Physik, München)
Tentative observation of a gamma-ray line at the Fermi LAT
Jul 19, 2012
from 04:15 PM to 05:15 PM
|Where||SLAC, Kavli Auditorium|
|Contact Name||Matthew Wood|
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Abstract: Using 43 months of public gamma-ray data from the Fermi Large Area Telescope, we find in regions close to the galactic center at energies of 130 GeV a 4.6 sigma excess that is not inconsistent with a gamma-ray line from dark matter annihilation. When taking into account the look-elsewhere effect, the significance of the observed signature is 3.3 sigma. If interpreted in terms of dark matter particles annihilating into a photon pair, the observations imply a partial annihilation cross-section of about 10^-27 cm^3 s^-1 and a dark matter mass around 130 GeV. We will focus on details of the statistical analysis and possible caveats, and comment on future prospects.