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Search for Dark Matter Annihilation Signals in the HESS Inner Galaxy Survey
Univ Namibia, Namibia.
Dublin Inst Adv Studies, Ireland;Max Planck Inst Kernphys, Germany;RAU, Armenia.
Max Planck Inst Kernphys, Germany.
Aix Marseille Univ, France.
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2022 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 129, no 11, article id 111101Article in journal (Refereed) Published
Abstract [en]

The central region of the Milky Way is one of the foremost locations to look for dark matter (DM) signatures. We report the first results on a search for DM particle annihilation signals using new observations from an unprecedented gamma-ray survey of the Galactic Center (GC) region, i.e., the Inner Galaxy Survey, at very high energies (& GSIM;100 GeV) performed with the H.E.S.S. array of five ground-based Cherenkov telescopes. No significant gamma-ray excess is found in the search region of the 2014-2020 dataset and a profile likelihood ratio analysis is carried out to set exclusion limits on the annihilation cross section (sigma v). Assuming Einasto and Navarro-Frenk-White (NFW) DM density profiles at the GC, these constraints are the strongest obtained so far in the TeV DM mass range. For the Einasto profile, the constraints reach (sigma v) values of 3.7 x 10-26 cm3 s-1 for 1.5 TeV DM mass in the W+W- annihilation channel, and 1.2 x 10-26 cm3 s-1 for 0.7 TeV DM mass in the tau+tau- annihilation channel. With the H.E.S.S. Inner Galaxy Survey, ground-based gamma-ray observations thus probe (sigma v) values expected from thermal-relic annihilating TeV DM particles.

Place, publisher, year, edition, pages
American Physical Society, 2022. Vol. 129, no 11, article id 111101
National Category
Astronomy, Astrophysics and Cosmology
Research subject
Physics, Astroparticle Physics
Identifiers
URN: urn:nbn:se:lnu:diva-117769DOI: 10.1103/PhysRevLett.129.111101ISI: 000877603700008PubMedID: 36154418Scopus ID: 2-s2.0-85138290208OAI: oai:DiVA.org:lnu-117769DiVA, id: diva2:1716669
Available from: 2022-12-06 Created: 2022-12-06 Last updated: 2023-03-27Bibliographically approved

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Becherini, YvonnePunch, MichaelSenniappan, Mohanraj

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Department of Physics and Electrical Engineering
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