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Detection of Gamma Rays From a Starburst Galaxy

Fabio Acero F. Aharonian A. G. Akhperjanian G. Anton U. Barres de Almeida A. R. Bazer-Bachi 1 Y. Becherini 2 B. Behera K. Bernlöhr A. Bochow C. Boisson 3 J. Bolmont 4 V. Borrel 1 J. Brucker F. Brun 4 P. Brun 5 R. Bühler T. Bulik I. Büsching T. Boutelier 6 P. M. Chadwick A. Charbonnier 4 R. C. G. Chaves A. Cheesebrough L.-M. Chounet A. C. Clapson G. Coignet 7 M. Dalton M. K. Daniel I. D. Davids B. Degrange C. Deil H. J. Dickinson A. Djannati-Ataï 8 W. Domainko L. O'C. Drury F. Dubois 7 G. Dubus 6 J. Dyks M. Dyrda K. Egberts D. Emmanoulopoulos P. Espigat 2 C. Farnier S. Fegan F. Feinstein A. Fiasson 7 A. Förster G. Fontaine M. Füßling S. Gabici Y.A. Gallant L. Gérard 2 D. Gerbig B. Giebels J. F. Glicenstein 5 B. Glück P. Goret 5 D. Göring D. Hauser M. Hauser S. Heinz G. Heinzelmann G. Henri 6 G. Hermann J. A. Hinton A. Hoffmann W. Hofmann P. Hofverberg S. Hoppe D. Horns A. Jacholkowska 4 O. C. de Jager C. Jahn I. Jung K. Katarzy Ski U. Katz S. Kaufmann M. Kerschhaggl D. Khangulyan B. Khélifi D. Keogh D. Klochkov W. Klu Niak T. Kneiske Nu. Komin 5 K. Kosack R. Kossakowski 7 G. Lamanna 7 J.-P. Lenain 3 T. Lohse V. Marandon 2 O. Martineau-Huynh 4 A. Marcowith J. Masbou 7 D. Maurin 4 T. J. L. Mccomb M. C. Medina 3 J. Méhault R. Moderski Emmanuel Moulin 5 M. Naumann-Godo M. de Naurois 4 D. Nedbal D. Nekrassov B. Nicholas J. Niemiec S. J. Nolan S. Ohm J.-F. Olive 1 E. de Oña Wilhelmi K. J. Orford M. Ostrowski M. Panter M. Paz Arribas G. Pedaletti G. Pelletier 6 P.-O. Petrucci 6 S. Pita 2 G. Pühlhofer M. Punch 8 A. Quirrenbach B. C. Raubenheimer M. Raue S. M. Rayner O. Reimer M. Renaud 2 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. Schöck U. Schwanke S. Schwarzburg S. Schwemmer A. Shalchi M. Sikora J. L. Skilton H. Sol 3 L. Stawarz R. Steenkamp C. Stegmann F. Stinzing G. Superina A. Szostek P. H. Tam J.-P. Tavernet 4 R. Terrier 8 O. Tibolla M. Tluczykont C. van Eldik G. Vasileiadis C. Venter L. Venter 3 J. P. Vialle 7 P. Vincent 4 M. Vivier 5 H. J. Völk F. Volpe S. J. Wagner M. Ward A. A. Zdziarski A. Zech
Abstract : Starburst galaxies exhibit in their central regions a highly increased rate of supernovae, the remnants of which are thought to accelerate energetic cosmic rays up to energies of ~ 10^15 eV. We report the detection of gamma rays -- tracers of such cosmic rays -- from the starburst galaxy NGC 253 using the H.E.S.S. array of imaging atmospheric Cherenkov telescopes. The gamma-ray flux above 220 GeV is F = (5.5 +/- 1.0stat +/- 2.8sys) x 10^-13 ph. s-1 cm-2, implying a cosmic-ray density about three orders of magnitude larger than that in the center of the Milky Way. The fraction of cosmic-ray energy channeled into gamma rays in this starburst environment is 5 times larger than that in our Galaxy.
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Submitted on : Tuesday, September 29, 2009 - 5:41:10 PM
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Fabio Acero, F. Aharonian, A. G. Akhperjanian, G. Anton, U. Barres de Almeida, et al.. Detection of Gamma Rays From a Starburst Galaxy. Science, American Association for the Advancement of Science, 2009, 326, 5956, pp.1080-1082. ⟨10.1126/science.1178826⟩. ⟨in2p3-00420843⟩

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