Searching signals of dark matter from unidentified Fermi-LAT objects with H.E.S.S.
Montanari A, Moulin E, Malyshev D, Glawion D (2022)
Publication Type: Conference contribution
Publication year: 2022
Publisher: Institute of Physics
Book Volume: 2156
Conference Proceedings Title: Journal of Physics: Conference Series
Event location: Virtual
DOI: 10.1088/1742-6596/2156/1/012075
Abstract
Milky Way-sized galaxies harbor a population of unmerged dark matter subhalos, as shown from cosmological N-body simulations. These subhalos could shine in gamma-rays and be eventually detected as unidentified sources in gamma-ray surveys. From a thorough selection of unidentified Fermi-LAT Objects (UFOs), we observe four UFOs with H.E.S.S. and we search for very high-energy (VHE, E ≥ 100 GeV) gamma-ray emission. Considering dark matter masses above a few hundred GeV, the observed UFOs could be identified as dark matter subhalos, given their hard gamma-ray spectra in the few-ten-to-hundred GeV energy range. Since no significant very-high-energy gamma-ray emission is detected in any of the four UFOs dataset nor in the combined one, we derive constraints on the product of the velocity-weighted annihilation cross-section hσvi by the J-factor for the dark matter models. We derive 95% CL upper limits on hσviJ in W+W− and τ+τ− annihilation channels for the TeV dark matter particles. Considering thermal WIMPs, we derive constraints on the J-factors from the H.E.S.S. observations. Assuming model-dependent predictions from cosmological N-body simulations on the J-factor distribution for Milky Way-sized galaxies, the dark matter models with masses greater than 0.3 TeV for the UFO emissions can be ruled out at high confidence level.
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APA:
Montanari, A., Moulin, E., Malyshev, D., & Glawion, D. (2022). Searching signals of dark matter from unidentified Fermi-LAT objects with H.E.S.S. In Journal of Physics: Conference Series. Virtual: Institute of Physics.
MLA:
Montanari, A., et al. "Searching signals of dark matter from unidentified Fermi-LAT objects with H.E.S.S." Proceedings of the 17th International Conference on Topics in Astroparticle and Underground Physics, TAUP 2021, Virtual Institute of Physics, 2022.
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