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Legacy Analysis of Dark Matter Annihilation from the Milky Way Dwarf Spheroidal Galaxies with 14 Years of Fermi-LAT Data

Presentation #300.01 in the session ISM/Galaxies.

Published onMay 03, 2024
Legacy Analysis of Dark Matter Annihilation from the Milky Way Dwarf Spheroidal Galaxies with 14 Years of Fermi-LAT Data

The Milky Way dwarf spheroidal satellite galaxies (dSphs) represent particularly powerful targets to search for gamma rays from dark matter (DM) annihilation or decay since they are nearby, DM-dominated, and lack significant emission from standard astrophysical processes. In this work, we report on an analysis of the Milky Way dSphs using over 14 years of LAT data along with an updated census of dSphs. While our analysis yields no significant signal, the combined likelihood analysis of the dSphs shows the presence of a 2-3 σ signal at a DM mass of 150-230 GeV. We project that this signal, if real, could reach the 4-σ confidence level with an additional 10 years of Fermi-LAT observations.

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