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

F. Aharonian A.G. Akhperjanian G. Anton U. Barres de Almeida A.R. Bazer-Bachi 1 Y. Becherini B. Behera K. Bernlöhr A. Bochow C. Boisson 2 J. Bolmont 3 V. Borrel 1 J. Brucker F. Brun 3 P. Brun 4 R. Bühler T. Bulik I. Büsching T. Boutelier 5 P.M. Chadwick A. Charbonnier 3 R.C.G. Chaves A. Cheesebrough L.-M. Chounet 6 G. Coignet 7 M. Dalton M.K. Daniel I.D. Davids B. Degrange 6 C. Deil H.J. Dickinson A. Djannati-Ataï W. Domainko L.O'C. Drury F. Dubois 7 G. Dubus 5 J. Dyks M. Dyrda K. Egberts D. Emmanoulopoulos P. Espigat C. Farnier F. Feinstein A. Fiasson 7 A. Förster G. Fontaine 6 M. Füsling S. Gabici Y.A. Gallant L. G'Erard D. Gerbig B. Giebels J.F. Glicenstein 4 B. Glück P. Goret 4 D. Göring D. Hauser M. Hauser S. Heinz G. Heinzelmann G. Henri 5 G. Hermann J.A. Hinton A. Hoffmann W. Hofmann M. Holleran S. Hoppe D. Horns A. Jacholkowska 3 O.C. de Jager C. Jahn I. Jung K. Katarzy'Nski U. Katz S. Kaufmann E. Kendziorra M. Kerschhaggl D. Khangulyan B. Khélifi 6 D. Keogh W. Klu'Zniak T. Kneiske Nu. Komin K. Kosack R. Kossakowski 7 G. Lamanna 7 J.-P. Lenain 2 T. Lohse V. Marandon J.M. Martin 2 O. Martineau-Huynh 3 A. Marcowith J. Masbou 7 D. Maurin 3 T.J.L. Mccomb M.C. Medina 2 R. Moderski Emmanuel Moulin 4 M. Naumann-Godo 6 M. de Naurois D. Nedbal D. Nekrassov B. Nicholas J. Niemiec S.J. Nolan S. Ohm J.-F. Olive 1 E. de O˜na K.J. Orford M. Ostrowski M. Panter M. Paz Arribas G. Pedaletti G. Pelletier 5 P.-O. Petrucci 5 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 7 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 2 D. Spangler L. Stawarz R. Steenkamp C. Stegmann F. Stinzing G. Superina 6 A. Szostek P.H. Tam J.-P. Tavernet 3 R. Terrier O. Tibolla M. Tluczykont C. van Eldik G. Vasileiadis C. Venter L. Venter 2 J.P. Vialle 7 P. Vincent 3 M. Vivier 4 H.J. Völk F. Volpe S.J. Wagner M. Ward A.A. Zdziarski A. Zech 2
Abstract : The 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.
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Submitted on : Monday, May 4, 2009 - 3:24:30 PM
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F. Aharonian, A.G. Akhperjanian, G. Anton, U. Barres de Almeida, A.R. Bazer-Bachi, et al.. Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S. Astronomy and Astrophysics - A&A, EDP Sciences, 2009, 508, pp.561-564. ⟨10.1051/0004-6361/200913323⟩. ⟨in2p3-00380853⟩

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