Search for dark matter annihilation signals from UFOs with H.E.S.S
D. Malyshev, A. Montanari, E. Moulin, D. Glawion (for the H.E.S.S., collaboration)

TL;DR
This study used H.E.S.S. gamma-ray observations to search for dark matter annihilation signals from unidentified Fermi-LAT objects, setting constraints on dark matter models and challenging their ability to explain these sources.
Contribution
First to systematically analyze H.E.S.S. data for dark matter signals from UFOs, deriving new constraints on annihilation cross-sections and J-factors for TeV-scale dark matter.
Findings
No significant gamma-ray emission detected from UFOs.
Constraints placed on dark matter annihilation cross-section and J-factors.
Models with dark matter mass > 0.3 TeV are marginally compatible with UFO emissions.
Abstract
Cosmological N-body simulations show that Milky-Way-sized galaxies harbor a population of unmerged dark matter subhalos. These subhalos could shine in gamma rays and be eventually detected in gamma-ray surveys as unidentified sources. We search for very-high-energy (VHE, GeV) gamma-ray emission using H.E.S.S. observations carried out from a thorough selection of unidentified Fermi-LAT Objects (UFOs) as dark matter subhalo candidates. Provided that the dark matter mass is higher than a few hundred GeV, the emission of the UFOs can be well described by dark matter annihilation models. No significant VHE gamma-ray emission is detected in any UFO dataset nor in their combination. We, therefore, derive constraints on the product of the velocity-weighted annihilation cross-section by the -factor on dark matter models describing the UFO emissions. Upper…
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Taxonomy
TopicsDark Matter and Cosmic Phenomena · Particle physics theoretical and experimental studies · Cosmology and Gravitation Theories
