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GR: Fachverband Gravitation und Relativitätstheorie

GR 7: Cosmology

GR 7.4: Vortrag

Mittwoch, 2. März 2016, 18:05–18:25, VMP6 HS A

Galactic center analysis with Fermi LAT Pass 8 data and limits on dark matter annihilation — •Dmitry Malyshev for the Fermi LAT collaboration — ECAP, Erwin-Rommel str. 1, Erlangen, Germany

We study the excess emission around a few GeV towards the Galactic center (GC) with Pass 8 Fermi-LAT data and estimate the uncertainty of its spectrum due to diffuse emission modelling. In particular, we test several GALPROP models of Galactic diffuse emission, develop an alternative distribution of gas along the line of sight based on starlight extinction data, model the Fermi bubbles at low latitudes, and test additional sources of cosmic ray electrons near the GC. We find that in all models that we have tested the excess emission persists. As an alternative approach to estimate the uncertainty due to diffuse emission modelling we perform a scan of a cusp template along the Galactic plane. We find that the excess emission as a fraction of the background is comparable to the uncertainties found elsewhere in the Galactic plane. We put limits on DM annihilation assuming that DM particles cannot produce a signal that exceeds the uncertainties due to diffuse emission modelling.