Preprint PUBDB-2018-03794

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Searches for gamma-ray lines and pure WIMP spectra from Dark Matter annihilations in dwarf galaxies with H.E.S.S

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2018

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Report No.: CERN-TH-2018-201; DESY-18-157; arXiv:1810.00995

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 $\langle \sigma v \rangle \lesssim 3 \times 10^{-25}$ cm$^3$ 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.

Keyword(s): dark matter: annihilation ; dark matter: mass ; cross section: annihilation ; mass: thermal ; gamma ray ; spectral ; galaxy ; WIMP ; electroweak interaction ; multiplet ; HESS


Note: PIF-2017-72

Contributing Institute(s):
  1. High Energy Steroscopic System (ZEU-HESS)
Research Program(s):
  1. 613 - Matter and Radiation from the Universe (POF3-613) (POF3-613)
Experiment(s):
  1. High Energy Stereoscopic System

Appears in the scientific report 2018
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http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Journal Article  ;  ;  ; et al
Searches for gamma-ray lines and ‘pure WIMP’ spectra from Dark Matter annihilations in dwarf galaxies with H.E.S.S.
Journal of cosmology and astroparticle physics 1811(11), 037 () [10.1088/1475-7516/2018/11/037]  GO Embargoed OpenAccess  Download fulltext Files  Download fulltextFulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS


 Record created 2018-10-15, last modified 2023-09-13


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