Gamma Rays from Dark Matter Annihilations Strongly Constrain the Substructure in Halos

2009/05/31 by Anders Pinzke, Christoph Pfrommer, Lars Bergstrom +1 · 2 citations
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Galaxies: Formation, Evolution, Phenomena #astro-ph.CO #astro-ph.HE

paper · pdf · doi:10.1103/physrevlett.103.181302

published as Phys.Rev.Lett.103:181302,2009 · 5 pages, 2 figures (published version; minor corrections to figures and result, equation added)

openalex publication_date 2009/10/29 · arxiv created 2009/11/20 · arxiv updated 2009/12/08 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30

Abstract

To fit recent data, e(+/-) from dark matter (DM) needs a boosted annihilation rate. This may imply an observable level of gamma rays from nearby galaxy clusters for the Fermi satellite. Using EGRET data, we limit the minimum mass of DM substructures to be about 5x10(3) times larger than for cold DM, meaning a cutoff similar to, e.g., warm DM. We numerically simulate clusters to reliably model the background. If we assume no anomalous boost factor, we find comparable levels of gamma-ray emission from DM and cosmic ray interactions, giving a chance with future data to characterize the DM.

Citations

• Constraining Global Properties of the Draco Dwarf Spheroidal Galaxy

Cited by

• EVIDENCE FOR INDIRECT DETECTION OF DARK MATTER FROM GALAXY CLUSTERS IN FERMI γ-RAY DATA
• DARK MATTER DECAY AND ANNIHILATION IN THE LOCAL UNIVERSE: CLUES FROM FERMI

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