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1.	Aharonian, F., et al. (author) Energy Spectrum of Cosmic-Ray Electrons at TeV Energies 2008 In: Physical Review Letters. - : APS Physics. - 0031-9007 .- 1079-7114. ; 101:26 Journal article (peer-reviewed)abstract The very large collection area of ground-based gamma-ray telescopes gives them a substantial advantage over balloon or satellite based instruments in the detection of very-high-energy (> 600 GeV) cosmic-ray electrons. Here we present the electron spectrum derived from data taken with the High Energy Stereoscopic System (H.E.S.S.) of imaging atmospheric Cherenkov telescopes. In this measurement, the first of this type, we are able to extend the measurement of the electron spectrum beyond the range accessible to direct measurements. We find evidence for a substantial steepening in the energy spectrum above 600 GeV compared to lower energies.
2.	Aharonian, F., et al. (author) Limits on an Energy Dependence of the Speed of Light from a Flare of the Active Galaxy PKS 2155-304 2008 In: Physical Review Letters. - : APS Physics. - 0031-9007 .- 1079-7114. ; 101:17 Journal article (peer-reviewed)abstract In the past few decades, several models have predicted an energy dependence of the speed of light in the context of quantum gravity. For cosmological sources such as active galaxies, this minuscule effect can add up to measurable photon-energy dependent time lags. In this Letter a search for such time lags during the High Energy Stereoscopic System observations of the exceptional very high energy flare of the active galaxy PKS 2155-304 on 28 July 2006 is presented. Since no significant time lag is found, lower limits on the energy scale of speed of light modifications are derived.

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Type of publication: journal article (2)

Type of content: peer-reviewed (2)

Author/Editor: Lohse, T. (2); Heinzelmann, G. (2); Buehler, R. (2); Kaufmann, S. (2); Tibolla, O. (2); Benbow, W. (2); show more...; Pedaletti, G. (2); Dickinson, H. J. (2); Bulik, T. (2); Aharonian, F. (2); Akhperjanian, A. G. (2); Becherini, Yvonne (2); Bernloehr, K. (2); Boisson, C. (2); Brun, P. (2); Chaves, R. C. G. (2); Degrange, B. (2); Deil, C. (2); Djannati-Atai, A. (2); Domainko, W. (2); Drury, L. O 'C. (2); Dyks, J. (2); Egberts, K. (2); Fiasson, A. (2); Fontaine, G. (2); Foerster, A. (2); Fuessling, M. (2); Gabici, S. (2); Gallant, Y. A. (2); Giebels, B. (2); Glicenstein, J. F. (2); Henri, G. (2); Hermann, G. (2); Hinton, J. A. (2); Hofmann, W. (2); Horns, D. (2); Jacholkowska, A. (2); Katarzynski, K. (2); Khangulyan, D. (2); Khelifi, B. (2); Komin, Nu. (2); Kosack, K. (2); Lamanna, G. (2); Lenain, J. -P (2); Marandon, V. (2); Marcowith, A. (2); Moderski, R. (2); Moulin, E. (2); de Naurois, M. (2); Niemiec, J. (2); show less...

University: Linnaeus University (2)

Language: English (2)

Research subject (UKÄ/SCB): Natural sciences (2)

Year: 2008 (2)Undo refine

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