Smoking gun or damp squib? Gamma-ray lines in the Fermi LAT data

Who: Christoph Weniger (GRAPPA Institute)
When: Monday, February 25, 2013 at 14:15
Where: U49

 

The observation of a gamma-ray line at the Galactic center would be a `smoking gun’ signature for annihilation of WIMP dark matter particles in the Universe. At energies around 130 GeV, we find first indications for such a line feature in the public data taken by the Fermi Large Area Telescope since 2008. The excess is not inconsistent with a gamma-ray line from dark matter annihilation. If interpreted in terms of dark matter particles annihilating into a photon pair, the observations require a very large partial annihilation cross-section of about 10^-27 cm^3 s^-1. After a general introduction to indirect dark matter searches with gamma rays, we will focus on details and caveats of the statistical analysis, latest developments, a similar feature in the Earth limb, and how the tentative signal will be hopefully either rejected or confirmed in the not too distant future.

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