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Search for dark matter annihilation signals from UFOs with H.E.S.S
- Source :
- PoS, 37th International Cosmic Ray Conference, 37th International Cosmic Ray Conference, Jul 2021, Berlin, Germany. pp.538
- Publication Year :
- 2021
- Publisher :
- HAL CCSD, 2021.
-
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, $E\geq 100$ 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 $\langle \sigma v\rangle$ by the $J$-factor on dark matter models describing the UFO emissions. Upper limits at 95% confidence level are derived on $\langle \sigma v\rangle J$ in $W^+W^-$ and $\tau^+\tau^-$ annihilation channels for the TeV dark matter particles. Focusing on thermal WIMPs, strong constraints on the $J$-factors are obtained from H.E.S.S. observations. Adopting model-dependent predictions from cosmological N-body simulations on the $J$-factor distribution function for Milky Way (MW)-sized galaxies, only $\lesssim 0.3$ TeV mass dark matter models marginally allow to explain observed UFO emission.<br />Comment: 10 pages, 3 figures, Proceedings of the 37th International Cosmic Ray Conference (ICRC2021)
- Subjects :
- High Energy Astrophysical Phenomena (astro-ph.HE)
model: annihilation
WIMP
Astrophysics::High Energy Astrophysical Phenomena
dark matter: mass
FOS: Physical sciences
dark matter: annihilation
Astrophysics::Cosmology and Extragalactic Astrophysics
GeV
GLAST
cross section: annihilation
thermal
gamma ray: emission
gamma ray: VHE
dark matter: halo
HESS
many-body problem
TeV
galaxy
distribution function
Astrophysics - High Energy Astrophysical Phenomena
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Astrophysics::Galaxy Astrophysics
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Journal :
- PoS, 37th International Cosmic Ray Conference, 37th International Cosmic Ray Conference, Jul 2021, Berlin, Germany. pp.538
- Accession number :
- edsair.doi.dedup.....35ee2f9e90474d22eaa83bbe51525965