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|Title:||Searches for gamma-ray lines and 'pure WIMP' spectra from Dark Matter annihilations in dwarf galaxies with H.E.S.S.|
|Citation:||Journal of Cosmology and Astroparticle Physics, 2018; 2018(11):037-1-037-22|
|H. Abdalla, F. Aharonian, F. Ait Benkhali, E.O. Angüner, M. Arakawa ... Gavin P. Rowell ... et al.|
|Abstract:||Dwarf spheroidal galaxies are among the most promising targets for detecting signals of Dark Matter (DM) annihilations. The H.E.S.S. experiment has observed five of these systems for a total of about 130 hours. The data are re-analyzed here, and, in the absence of any detected signals, are interpreted in terms of limits on the DM annihilation cross section. Two scenarios are considered: i) DM annihilation into mono-energetic gamma-rays and ii) DM in the form of pure WIMP multiplets that, annihilating into all electroweak bosons, produce a distinctive gamma-ray spectral shape with a high-energy peak at the DM mass and a lower-energy continuum. For case i), upper limits at 95% confidence level of about lang σ v rang lesssim 3 × 10−25 cm3 s−1 are obtained in the mass range of 400 GeV to 1 TeV. For case ii), the full spectral shape of the models is used and several excluded regions are identified, but the thermal masses of the candidates are not robustly ruled out.|
|Keywords:||Dark matter detectors; dark matter experiments; dwarfs galaxies; gamma ray detectors|
|Rights:||© 2018 IOP Publishing Ltd and Sissa Medialab|
|Appears in Collections:||Physics publications|
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