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Area of Science:

  • High-energy astrophysics
  • Particle cosmology
  • Galactic gamma-ray astronomy

Background:

  • The Galactic Center is a prime target for detecting dark matter (DM) annihilation signatures.
  • Previous searches for DM signals have been limited by observational depth and energy range.

Purpose of the Study:

  • To search for dark matter particle annihilation signals in the Galactic Center region using unprecedented gamma-ray survey data.
  • To set exclusion limits on dark matter annihilation cross-sections in the TeV mass range.

Main Methods:

  • Utilized data from the H.E.S.S. (High Energy Stereoscopic System) array, comprising five ground-based Cherenkov telescopes.
  • Conducted a gamma-ray survey of the Galactic Center region (Inner Galaxy Survey) for energies above 100 GeV.
  • Performed a profile likelihood ratio analysis on the 2014-2020 dataset to set exclusion limits.

Main Results:

  • No significant gamma-ray excess attributable to dark matter annihilation was detected.
  • Established the strongest exclusion limits to date for TeV-mass dark matter annihilation cross-sections, assuming Einasto and Navarro-Frenk-White (NFW) DM density profiles.
  • Achieved limits of 3.7x10^-26 cm^3/s for 1.5 TeV DM in the W+W- channel and 1.2x10^-26 cm^3/s for 0.7 TeV DM in the tau+tau- channel (Einasto profile).

Conclusions:

  • The H.E.S.S. Inner Galaxy Survey provides stringent constraints on dark matter annihilation cross-sections.
  • These results probe values consistent with thermal-relic annihilating TeV dark matter particles.
  • Ground-based gamma-ray astronomy is a powerful tool for dark matter searches in the Galactic Center.