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Search for γ-Ray Line Signals from Dark Matter Annihilations in the Inner Galactic Halo from 10 Years of Observations with H.E.S.S.

Authors
  • Abdallah, H1
  • Abramowski, A2
  • Aharonian, F3, 4, 5
  • Ait Benkhali, F3
  • Angüner, E O6
  • Arakawa, M7
  • Arrieta, M8
  • Aubert, P9
  • Backes, M10
  • Balzer, A11
  • Barnard, M1
  • Becherini, Y12
  • Becker Tjus, J13
  • Berge, D11
  • Bernhard, S14
  • Bernlöhr, K3
  • Blackwell, R15
  • Böttcher, M1
  • Boisson, C8
  • Bolmont, J16
  • And 237 more
  • 1 Centre for Space Research, North-West University, Potchefstroom 2520, South Africa. , (South Africa)
  • 2 Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, D 22761 Hamburg, Germany. , (Germany)
  • 3 Max-Planck-Institut für Kernphysik, P.O. Box 103980, D 69029 Heidelberg, Germany. , (Germany)
  • 4 Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, Dublin 2, Ireland. , (Ireland)
  • 5 National Academy of Sciences of the Republic of Armenia, Marshall Baghramian Avenue, 24, 0019 Yerevan, Armenia. , (Armenia)
  • 6 Instytut Fizyki Jądrowej PAN, ul. Radzikowskiego 152, 31-342 Kraków, Poland. , (Poland)
  • 7 Department of Physics, Rikkyo University, 3-34-1 Nishi-Ikebukuro, Toshima-ku, Tokyo 171-8501, Japan. , (Japan)
  • 8 LUTH, Observatoire de Paris, PSL Research University, CNRS, Université Paris Diderot, 5 Place Jules Janssen, 92190 Meudon, France. , (France)
  • 9 Laboratoire d'Annecy-le-Vieux de Physique des Particules, Université Savoie Mont-Blanc, CNRS/IN2P3, F-74941 Annecy-le-Vieux, France. , (France)
  • 10 University of Namibia, Department of Physics, Private Bag 13301, Windhoek, Namibia. , (Namibia)
  • 11 GRAPPA, Anton Pannekoek Institute for Astronomy and Institute of High-Energy Physics, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands. , (Netherlands)
  • 12 Department of Physics and Electrical Engineering, Linnaeus University, 351 95 Växjö, Sweden. , (Sweden)
  • 13 Institut für Theoretische Physik, Lehrstuhl IV: Weltraum und Astrophysik, Ruhr-Universität Bochum, D 44780 Bochum, Germany. , (Germany)
  • 14 Institut für Astro- und Teilchenphysik, Leopold-Franzens-Universität Innsbruck, A-6020 Innsbruck, Austria. , (Austria)
  • 15 School of Chemistry and Physics, University of Adelaide, Adelaide 5005, Australia. , (Australia)
  • 16 Sorbonne Universités, UPMC Université Paris 06, Université Paris Diderot, Sorbonne Paris Cité, CNRS, Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), 4 place Jussieu, F-75252 Paris Cedex 5, France. , (France)
  • 17 DESY, D-15738 Zeuthen, Germany. , (Germany)
  • 18 Laboratoire Univers et Particules de Montpellier, Université Montpellier, CNRS/IN2P3, CC 72, Place Eugène Bataillon, F-34095 Montpellier Cedex 5, France. , (France)
  • 19 Université Bordeaux 1, CNRS/IN2P3, Centre d'Études Nucléaires de Bordeaux Gradignan, 33175 Gradignan, France. , (France)
  • 20 IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France. , (France)
  • 21 Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen Centre for Astroparticle Physics, Erwin-Rommel-Strasse 1, D 91058 Erlangen, Germany. , (Germany)
  • 22 Astronomical Observatory, The University of Warsaw, Al. Ujazdowskie 4, 00-478 Warsaw, Poland. , (Poland)
  • 23 Institut für Astronomie und Astrophysik, Universität Tübingen, Sand 1, D 72076 Tübingen, Germany. , (Germany)
  • 24 Laboratoire Leprince-Ringuet, Ecole Polytechnique, CNRS/IN2P3, F-91128 Palaiseau, France. , (France)
  • 25 Aix Marseille Université, CNRS/IN2P3, CPPM UMR 7346, 13288 Marseille, France. , (France)
  • 26 School of Physics, University of the Witwatersrand, 1 Jan Smuts Avenue, Braamfontein, Johannesburg, 2050 South Africa. , (South Africa)
  • 27 Oskar Klein Centre, Department of Physics, Stockholm University, Albanova University Center, SE-10691 Stockholm, Sweden. , (Sweden)
  • 28 APC, AstroParticule et Cosmologie, Université Paris Diderot, CNRS/IN2P3, CEA/Irfu, Observatoire de Paris, Sorbonne Paris Cité, 10, rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France. , (France)
  • 29 Department of Physics and Astronomy, The University of Leicester, University Road, Leicester LE1 7RH, United Kingdom. , (United Kingdom)
  • 30 Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences, ul. Bartycka 18, 00-716 Warsaw, Poland. , (Poland)
  • 31 Institut für Physik und Astronomie, Universität Potsdam, Karl-Liebknecht-Strasse 24/25, D 14476 Potsdam, Germany. , (Germany)
  • 32 Landessternwarte, Universität Heidelberg, Königstuhl, D 69117 Heidelberg, Germany. , (Germany)
  • 33 Université Grenoble Alpes, CNRS, IPAG, F-38000 Grenoble, France. , (France)
  • 34 Institut für Physik, Humboldt-Universität zu Berlin, Newtonstrasse 15, D 12489 Berlin, Germany. , (Germany)
  • 35 Obserwatorium Astronomiczne, Uniwersytet Jagielloński, ul. Orla 171, 30-244 Kraków, Poland. , (Poland)
  • 36 Centre for Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Toruń, Poland. , (Poland)
  • 37 Japan Aeropspace Exploration Agency (JAXA), Institute of Space and Astronautical Science (ISAS), 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 229-8510, Japan. , (Japan)
  • 38 Department of Physics, University of the Free State, P.O. Box 339, Bloemfontein 9300, South Africa. , (South Africa)
  • 39 Yerevan Physics Institute, 2 Alikhanian Brothers Street, 375036 Yerevan, Armenia. , (Armenia)
Type
Published Article
Journal
Physical Review Letters
Publisher
American Physical Society
Publication Date
May 18, 2018
Volume
120
Issue
20
Pages
201101–201101
Identifiers
DOI: 10.1103/PhysRevLett.120.201101
PMID: 29864326
Source
Medline
License
Unknown

Abstract

Spectral lines are among the most powerful signatures for dark matter (DM) annihilation searches in very-high-energy γ rays. The central region of the Milky Way halo is one of the most promising targets given its large amount of DM and proximity to Earth. We report on a search for a monoenergetic spectral line from self-annihilations of DM particles in the energy range from 300 GeV to 70 TeV using a two-dimensional maximum likelihood method taking advantage of both the spectral and spatial features of the signal versus background. The analysis makes use of Galactic center observations accumulated over ten years (2004-2014) with the H.E.S.S. array of ground-based Cherenkov telescopes. No significant γ-ray excess above the background is found. We derive upper limits on the annihilation cross section ⟨σv⟩ for monoenergetic DM lines at the level of 4×10^{-28} cm^{3} s^{-1} at 1 TeV, assuming an Einasto DM profile for the Milky Way halo. For a DM mass of 1 TeV, they improve over the previous ones by a factor of 6. The present constraints are the strongest obtained so far for DM particles in the mass range 300 GeV-70 TeV. Ground-based γ-ray observations have reached sufficient sensitivity to explore relevant velocity-averaged cross sections for DM annihilation into two γ-ray photons at the level expected from the thermal relic density for TeV DM particles.

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