Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 73: Multi-messenger astronomy

T 73.7: Talk

Thursday, April 2, 2020, 18:00–18:15, H-HS X

On the origin of the diffuse Gamma-Ray Excess from the Galactic Center — •Joanna Berteaud, Iris Gebauer, and Wim de Boer — KIT, Karlsruhe, Germany

The Fermi-LAT has observed an excess in the diffuse emission from the Galactic center around a few GeV. Several interpretations of this excess exist, including the annihilation of dark matter, an undetected population of millisecond pulsars or the interactions of cosmic rays with molecular clouds. We have previously found a correlation of the GeV excess with the distribution of molecular clouds, traced by the CO emission line. However, what is called diffuse emission is subject to uncertainties originating from detector effects, such as the instrument response function and model uncertainties, such as the point source models. We have developed a novel technique to correct the Fermi-LAT data for the instrument response function. We have also studied the uncertainties originating from the point source model. We find that the GeV excess cannot be explained by these effects. After taking into account these uncertainties, we confirm the correlation between the GeV excess and the CO emission line.