PoS - Proceedings of Science
Volume 444 - 38th International Cosmic Ray Conference (ICRC2023) - Dark Matter Physics (DM)
Search for dark matter annihilation with a combined analysis of dwarf spheroidal galaxies from Fermi-LAT, HAWC, H.E.S.S., MAGIC and VERITAS
D. Kerszberg*, C. Armand, E. Charles, M. Di Mauro, C. Giuri, J.P. Harding, T. Miener, E. Moulin, L. Oakes, V. Poireau, E. Pueschel, J. Rico, L. Rinchiuso, D. Salazar-Gallegos, K. Tollefson, B. Zitzer  on behalf of the Fermi-LAT, HAWC, HESS, MAGIC and VERITAS Collaborations
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Pre-published on: July 25, 2023
Published on: September 27, 2024
Abstract
Dwarf spheroidal galaxies (dSphs) are among the most dark matter (DM) dominated objects, with negligible expected astrophysical gamma-ray emission. This makes nearby dSphs ideal targets for indirect searches of a DM particle signal. The accurate knowledge of their DM content makes it possible to derive robust constraints on the velocity-weighted cross section of DM annihilation. We report on a joint analysis of 20 dSphs observed by Fermi-LAT, HAWC, H.E.S.S., MAGIC, and VERITAS using a common maximum likelihood approach in order to maximize the sensitivity of DM searches towards these targets. Results for seven annihilation channels and spanning a range of DM masses from 5 GeV to 100 TeV will be presented. Furthermore, the systematic uncertainties coming from the astrophysical J-factor calculated from the dSph dark matter distribution will be discussed by comparing results obtained from two different sets of J-factors.
DOI: https://doi.org/10.22323/1.444.1426
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