1. Home
  2. Abstract – Publication

Abstract – Publication

Search for dark matter annihilation signals from unidentified fermi-LAT objects with H.E.S.S
ABDALLAH, H.; TANAKA, T.; VIANA, Aion.
Abstract: Cosmological N-body simulations show that Milky Way-sized galaxies harbor a population of unmerged dark matter (DM) subhalos. These subhalos could shine in gamma-rays and eventually be detected in gamma-ray surveys as unidentified sources. We performed a thorough selection among unidentified Fermi-Large Area Telescope Objects (UFOs) to identify them as possible tera-electron-volt-scale DM subhalo candidates. We search for very-high-energy (E >~ 100 GeV) gamma-ray emissions using H.E.S.S. observations toward four selected UFOs. Since no significant very-high-energy gamma-ray emission is detected in any data set of the four observed UFOs or in the combined UFO data set, strong constraints are derived on the product of the velocity-weighted annihilation cross section by the J factor for the DM models. The 95% confidence level observed upper limits derived from combined H.E.S.S. observations reach J values of 3.7 × 10 -5 and 8.1 × 10 -6 GeV2 cm-2 s-1 in the W+W- and t+t- channels, respectively, for a 1 TeV DM mass. Focusing on thermal weakly interacting massive particles, the H.E.S.S. constraints restrict the J factors to lie in the range 6.1 × 10 19-2.0 × 10 21 GeV2 cm-5 and the masses to lie between 0.2 and 6 TeV in the W+W- channel. For the t+t- channel, the J factors lie in the range 7.0 × 10 19-7.1 × 10 20 GeV2 cm-5 and the masses lie between 0.2 and 0.5 TeV. Assuming model-dependent predictions from cosmological N-body simulations on the J-factor distribution for Milky Way-sized galaxies, the DM models with masses >0.3 TeV for the UFO emissions can be ruled out at high confidence level.
Astrophysical Journal
v. 918, n. 1, p. 017-1-017-14 - Ano: 2021
Fator de Impacto: 5,874
    @article={003041308,author = {ABDALLAH, H.; TANAKA, T.; VIANA, Aion.},title={Search for dark matter annihilation signals from unidentified fermi-LAT objects with H.E.S.},journal={Astrophysical Journal},note={v. 918, n. 1, p. 017-1-017-14},year={2021}}

Contact us
São Carlos Institute of Physics - IFSC
Thank you for the message! We´ll be in touch as soon as possible..