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Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S

By F. Aharonian, A.G. Akhperjanian, G. Anton, U. Barres De Almeida, A.R. Bazer-Bachi, Y. Becherini, B. Behera, K. Bernlöhr, A. Bochow, C. Boisson, J. Bolmont, V. Borrel, J. Brucker, F. Brun, P. Brun, R. Bühler, T. Bulik, I. Büsching, T. Boutelier, P.M. Chadwick, A. Charbonnier, R.C.G. Chaves, A. Cheesebrough, L.-M. Chounet, G. Coignet, M. Dalton, M.K. Daniel, I.D. Davids, B. Degrange, C. Deil, H.J. Dickinson, A. Djannati-Ataï, W. Domainko, L.O'C. Drury, F. Dubois, G. Dubus, J. Dyks, M. Dyrda, K. Egberts, D. Emmanoulopoulos, P. Espigat, C. Farnier, F. Feinstein, A. Fiasson, A. Förster, G. Fontaine, M. Füsling, S. Gabici, Y.A. Gallant, L. G'Erard, D. Gerbig, B. Giebels, J.F. Glicenstein, B. Glück, P. Goret, D. Göring, D. Hauser, M. Hauser, S. Heinz, G. Heinzelmann, G. Henri, G. Hermann, J.A. Hinton, A. Hoffmann, W. Hofmann, M. Holleran, S. Hoppe, D. Horns, A. Jacholkowska, O.C. De Jager, C. Jahn, I. Jung, K. Katarzy'Nski, U. Katz, S. Kaufmann, E. Kendziorra, M. Kerschhaggl, D. Khangulyan, B. Khélifi, D. Keogh, W. Klu'Zniak, T. Kneiske, Nu. Komin, K. Kosack, R. Kossakowski, G. Lamanna, J.-P. Lenain, T. Lohse, V. Marandon, J.M. Martin, O. Martineau-Huynh, A. Marcowith, J. Masbou, D. Maurin, T.J.L. Mccomb, M.C. Medina, R. Moderski, Emmanuel Moulin, M. Naumann-Godo, M. De Naurois, D. Nedbal, D. Nekrassov, B. Nicholas, J. Niemiec, S.J. Nolan, S. Ohm, J.-F. Olive, E. De O˜na, K.J. Orford, M. Ostrowski, M. Panter, M. Paz Arribas, G. Pedaletti, G. Pelletier, P.-O. Petrucci, S. Pita, G. Pühlhofer, M. Punch, A. Quirrenbach, B.C. Raubenheimer, M. Raue, S.M. Rayner, O. Reimer, M. Renaud, F. Rieger, J. Ripken, L. Rob, S. Rosier-Lees, G. Rowell, B. Rudak, C.B. Rulten, J. Ruppel, V. Sahakian, A. Santangelo, R. Schlickeiser, F.M. Sch¨ock, R. Schröder, U. Schwanke, S. Schwarzburg, S. Schwemmer, A. Shalchi, J.L. Skilton, H. Sol, D. Spangler, L. Stawarz, R. Steenkamp, C. Stegmann, F. Stinzing, G. Superina, A. Szostek, P.H. Tam, J.-P. Tavernet, R. Terrier, O. Tibolla, M. Tluczykont, C. Van Eldik, G. Vasileiadis, C. Venter, L. Venter, J.P. Vialle, P. Vincent, M. Vivier, H.J. Völk, F. Volpe, S.J. Wagner, M. Ward, A.A. Zdziarski and A. Zech

Abstract

4 pages, 3 figuresThe measurement of an excess in the cosmic-ray electron spectrum between 300 and 800 GeV by the ATIC experiment has - together with the PAMELA detection of a rise in the positron fraction up to 100 GeV - motivated many interpretations in terms of dark matter scenarios; alternative explanations assume a nearby electron source like a pulsar or supernova remnant. Here we present a measurement of the cosmic-ray electron spectrum with H.E.S.S. starting at 340 GeV. The H.E.S.S. data with their lower statistical errors 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

Topics: [PHYS.ASTR.HE]Physics [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE], [SDU.ASTR.HE]Sciences of the Universe [physics]/Astrophysics [astro-ph]/High Energy Astrophysical Phenomena [astro-ph.HE]
Publisher: 'EDP Sciences'
Year: 2009
DOI identifier: 10.1051/0004-6361/200913323
OAI identifier: oai:HAL:in2p3-00380853v1
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