Скачать или смотреть Alessandro Montanari: Searching for dark matter annihilation signals with the.... (Kashiwa 2021)

Searching for dark matter annihilation signals with the H.E.S.S. Inner Galaxy Survey

Plenty of astrophysical and cosmological measurements suggests the presence of dark matter (DM) in the Universe. Nevertheless, its nature is still a mystery. One of the most promising paradigms explains dark matter as made of weakly interacting massive particles (WIMPs): particles with mass and coupling strength at the electroweak scale, thermally produced in the early universe and having present relic density consistent with that observed today. Gamma-rays are one of the possible final states of WIMP self-annihilation. The brightest source of DM annihilation is predicted to be the centre of the Milky Way, which has been surveyed in the last years by the H.E.S.S. telescopes array. The Inner Galaxy Survey (IGS) aims to achieve the best sensitivity to faint and diffuse emissions in the inner halo of the Milky Way. We analyzed 550 hours of observations taken between 2014 and 2020 with the five H.E.S.S. telescopes to search for a DM annihilation signal. No significant excess is found, therefore we derived strong constraints on the velocity-weighted annihilation cross-section of dark matter particles. Thermal WIMPs in the TeV mass range can be probed in different annihilation channels.