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HESS Limits on Linelike Dark Matter Signatures in the 100 GeV to 2 TeV Energy Range Close to the Galactic Center
North West Univ, South Africa.
Univ Hamburg, Germany.
Max Planck Inst Kernphys, Germany.
Max Planck Inst Kernphys, Germany.
Vise andre og tillknytning
2016 (engelsk)Inngår i: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 117, nr 15, artikkel-id 151302Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

A search for dark matter linelike signals iss performed in the vicinity of the Galactic Center by the H.E.S.S. experiment on observational data taken in 2014. An unbinned likelihood analysis iss developed to improve the sensitivity to linelike signals. The upgraded analysis along with newer data extend the energy coverage of the previous measurement down to 100 GeV. The 18 h of data collected with the H.E.S.S. array allow one to rule out at 95% C.L. the presence of a 130 GeV line (at l = -1.5 degrees, b = 0 degrees and for a dark matter profile centered at this location) previously reported in Fermi-LAT data. This new analysis overlaps significantly in energy with previous Fermi-LAT and H.E.S.S. results. No significant excess associated with dark matter annihilations was found in the energy range of 100 GeV to 2 TeV and upper limits on the gamma-ray flux and the velocity weighted annihilation cross section are derived adopting an Einasto dark matter halo profile. Expected limits for present and future large statistics H.E.S.S. observations are also given.

sted, utgiver, år, opplag, sider
2016. Vol. 117, nr 15, artikkel-id 151302
HSV kategori
Forskningsprogram
Fysik, Astropartikelfysik
Identifikatorer
URN: urn:nbn:se:lnu:diva-58084DOI: 10.1103/PhysRevLett.117.151302ISI: 000385341900005Scopus ID: 2-s2.0-84992144167OAI: oai:DiVA.org:lnu-58084DiVA, id: diva2:1046086
Tilgjengelig fra: 2016-11-11 Laget: 2016-11-11 Sist oppdatert: 2017-12-07bibliografisk kontrollert

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