Indirect Search for Dark Matter from the center of the Milky Way with the Fermi-Large Area Telescope

Aldo Morselli (for the Fermi/LAT Collaboration); Vincenzo Vitale

Indirect Search for Dark Matter from the center of the Milky Way with the Fermi-Large Area Telescope

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arxiv 0912.3828 v1 pith:2ULUFXCS submitted 2009-12-21 astro-ph.HE

Indirect Search for Dark Matter from the center of the Milky Way with the Fermi-Large Area Telescope

Vincenzo Vitale , Aldo Morselli (for the Fermi/LAT Collaboration) This is my paper

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keywords gamma-raycenteremissiongalacticdiffusesourcesdarkdetected

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The Galactic Center region is expected to host the largest density of Dark Matter (DM) particles within the Milky Way. Then a relatively large gamma-ray signal would be expected from the possible DM particles annihilation (or decay). We are searching for the DM gamma-ray signal from the Galactic Center, which is also rich in bright discrete gamma-ray sources. Furthermore intense diffuse gamma-ray emission due to cosmic-ray interactions with interstellar gas and radiation is detected from the same direction. A preliminary analysis of the data, taken during the first 11 months of the Fermi satellite operations, is reported. The diffuse gamma-ray backgrounds and discrete sources, as we know them today, can account for the large majority of the detected gamma-ray emission from the Galactic Center. Nevertheless a residual emission is left, not accounted for by the above models. An improved model of the Galactic diffuse emission and a careful evaluation of new (possibly unresolved) sources (or source populations) will improve the sensitivity for a DM search.

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Galactic Center gamma-ray excess from a generic triaxial halo
astro-ph.HE 2026-02 conditional novelty 6.0

Fermi-LAT fits show the Galactic Center gamma-ray excess keeps its spectrum and cuspiness under triaxial/tilted dark matter halo templates, but its morphology prefers a flipped-tilt halo and disfavors a stellar-halo profile.