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HESS Observations of the Galactic Center Region and Their Possible Dark Matter Interpretation

F. Aharonian A. G. Akhperjanian A.R. Bazer-Bachi 1 M. Beilicke W. Benbow D. Berge K. Bernlöhr C. Boisson 2 O. Bolz V. Borrel 1 I. Braun F. Breitling A. M. Brown R. Bühler I. Büsching S. Carrigan P. M. Chadwick L.-M. Chounet 3 R. Cornils L. Costamante B. Degrange 3 H. J. Dickinson A. Djannati-Ataï 4 L. O.'C. Drury G. Dubus 3 K. Egberts D. Emmanoulopoulos P. Espigat 5 F. Feinstein 6 E. Ferrero A. Fiasson 6 G. Fontaine 3 Seb. Funk S. Funk Y.A. Gallant 6 B. Giebels 3 J. F. Glicenstein 7 P. Goret 7 C. Hadjichristidis D. Hauser M. Hauser G. Heinzelmann G. Henri 8 G. Hermann J. A. Hinton W. Hofmann M. Holleran D. Horns A. Jacholkowska 6 O. C. de Jager B. Khélifi 3 Nu. Komin A. Konopelko K. Kosack I. J. Latham R. Le Gallou A. Lemière 5 M. Lemoine-Goumard 3 T. Lohse J.M. Martin 2 O. Martineau-Huynh 9 A. Marcowith 1 C. Masterson T. J. L. Mccomb M. de Naurois 9 D. Nedbal S. J. Nolan A. Noutsos K. J. Orford J. L. Osborne M. Ouchrif 9 M. Panter G. Pelletier 8 S. Pita 5 G. Pühlhofer M. Punch 5 B. C. Raubenheimer M. Raue S. M. Rayner A. Reimer O. Reimer J. Ripken L. Rob L. Rolland 7, 9 G. Rowell V. Sahakian L. Saugé 8 S. Schlenker R. Schlickeiser U. Schwanke H. Sol 2 D. Spangler F. Spanier R. Steenkamp C. Stegmann G. Superina 3 J.-P. Tavernet 9 R. Terrier 5 C.G. Théoret 5 M. Tluczykont 3 C. van Eldik G. Vasileiadis 6 C. Venter P. Vincent 9 H. J. Völk S. J. Wagner M. Ward
Abstract : The detection of gamma rays from the source HESS J1745-290 in the Galactic Center (GC) region with the High Energy Spectroscopic System (HESS) array of Cherenkov telescopes in 2004 is presented. After subtraction of the diffuse gamma-ray emission from the GC ridge, the source is compatible with a point source with spatial extent less than 1.2[prime](stat) (95% C.L.). The measured energy spectrum above 160 GeV is compatible with a power law with photon index of 2.25±0.04(stat)±0.10(syst) and no significant flux variation is detected. It is finally found that the bulk of the very high energy emission must have non-dark-matter origin.
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Submitted on : Wednesday, March 21, 2007 - 11:27:27 AM
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F. Aharonian, A. G. Akhperjanian, A.R. Bazer-Bachi, M. Beilicke, W. Benbow, et al.. HESS Observations of the Galactic Center Region and Their Possible Dark Matter Interpretation. Physical Review Letters, American Physical Society, 2006, 97, pp.221102. ⟨10.1103/PhysRevLett.97.221102⟩. ⟨in2p3-00137679⟩



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