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D. Keogh

Researcher at Durham University

Publications -  73
Citations -  6919

D. Keogh is an academic researcher from Durham University. The author has contributed to research in topics: Crab Nebula & High Energy Stereoscopic System. The author has an hindex of 44, co-authored 73 publications receiving 6535 citations.

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Energy Spectrum of Cosmic-Ray Electrons at TeV Energies

Felix Aharonian, +155 more
TL;DR: In this measurement, the first of this type, the High Energy Stereoscopic System is able to extend the measurement of the electron spectrum beyond the range accessible to direct measurements, finding evidence for a substantial steepening in the energy spectrum above 600 GeV compared to lower energies.
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Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S.

Felix Aharonian, +168 more
TL;DR: In this article, the authors present a measurement of the cosmic-ray electron spectrum with H.E.S. starting at 340 GeV and show no indication of a structure in the electron spectrum, but rather a power-law spectrum with spectral index of 3.0 +- 0.1 (stat.) + − 0.3 (syst.) which steepens at about 1 TeV.
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Search for a Dark Matter annihilation signal from the Galactic Center halo with H.E.S.S

A. Abramowski, +193 more
TL;DR: Limits are derived on the velocity-weighted annihilation cross section (σv) as a function of the DM particle mass that are among the best reported so far for this energy range and in particular differ only little between the chosen density profile parametrizations.
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Detection of Gamma Rays from a Starburst Galaxy

Fabio Acero, +175 more
TL;DR: In this paper, the authors reported the detection of gamma rays from the starburst galaxy NGC 253 using the H.E.S. array of imaging atmospheric Cherenkov telescopes.
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New constraints on the mid-IR EBL from the HESS discovery of VHE gamma-rays from 1ES 0229+200

Felix Aharonian, +143 more
TL;DR: In this paper, a very high energy (VHE: >100 GeV) γ-ray emission from the high-frequency peaked BL Lac 1ES 0229+200 was detected at the 6.6σ level in the HESS observations (41.8 h live time).