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Search for Dark Matter Annihilation Signals from the Fornax Galaxy Cluster with H.E.S.S

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arxiv 1202.5494 v2 pith:QXYUM2HS submitted 2012-02-24 astro-ph.HE

HESS Collaboration: A. Abramowski , F. Acero , F. Aharonian , A.G. Akhperjanian , G. Anton , A. Balzer , A. Barnacka , U. Barres de Almeida
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Y. Becherini J. Becker B. Behera K. Bernlöhr E. Birsin J. Biteau A. Bochow C. Boisson J. Bolmont P. Bordas J. Brucker F. Brun P. Brun T. Bulik I. Büsching S. Carrigan S. Casanova M. Cerruti P.M. Chadwick A. Charbonnier R.C.G. Chaves A. Cheesebrough A.C. Clapson G. Coignet G. Cologna J. Conrad M. Dalton M.K. Daniel I.D. Davids B. Degrange C. Deil H.J. Dickinson A. Djannati-Ataï W. Domainko L.O'C. Drury G. Dubus K. Dutson J. Dyks M. Dyrda K. Egberts P. Eger P. Espigat L. Fallon C. Farnier S. Fegan F. Feinstein M.V. Fernandes A. Fiasson G. Fontaine A. Förster M. Fü{ss}ling Y.A. Gallant H. Gast L. Gérard D. Gerbig B. Giebels J.F. Glicenstein B. Glück P. Goret D. Göring S. Häffner J.D. Hague D. Hampf M. Hauser S. Heinz G. Heinzelmann G. Henri G. Hermann J.A. Hinton A. Hoffmann W. Hofmann P. Hofverberg M. Holler D. Horns A. Jacholkowska O.C. de Jager C. Jahn M. Jamrozy I. Jung M.A. Kastendieck K. Katarzyński U. Katz S. Kaufmann D. Keogh D. Khangulyan B. Khélifi D. Klochkov W. Kluźniak T. Kneiske Nu. Komin K. Kosack R. Kossakowski H. Laffon G. Lamanna D. Lennarz T. Lohse A. Lopatin C.-C. Lu V. Marandon A. Marcowith J. Masbou D. Maurin N. Maxted M. Mayer T.J.L. McComb M.C. Medina J. Méhault R. Moderski E. Moulin C.L. Naumann M. Naumann-Godo M. de Naurois D. Nedbal D. Nekrassov N. Nguyen B. Nicholas J. Niemiec S.J. Nolan S. Ohm E. de Oña Wilhelmi B. Opitz M. Ostrowski I. Oya M. Panter M. Paz Arribas G. Pedaletti1 G. Pelletier P.-O. Petrucci S. Pita G. Pühlhofer M. Punch A. Quirrenbach M. Raue S.M. Rayner A. Reimer O. Reimer M. Renaud R. de los Reyes F. Rieger J. Ripken L. Rob S. Rosier-Lees G. Rowell B. Rudak C.B. Rulten J. Ruppel V. Sahakian D.A. Sanchez A. Santangelo R. Schlickeiser F.M. Schöck A. Schulz U. Schwanke S. Schwarzburg S. Schwemmer F. Sheidaei J.L. Skilton H. Sol G. Spengler {L}. Stawarz R. Steenkamp C. Stegmann F. Stinzing K. Stycz I. Sushch A. Szostek J.-P. Tavernet R. Terrier M. Tluczykont K. Valerius C. van Eldik G. Vasileiadis C. Venter J.P. Vialle A. Viana P. Vincent H.J. Völk F. Volpe S. Vorobiov M. Vorster S.J. Wagner M. Ward R. White A. Wierzcholska M. Zacharias A. Zajczyk A.A. Zdziarski A. Zech H.-S. Zechlin
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classification astro-ph.HE
keywords annihilationparticlesigmalimitsmodelssubstructuresupperadditional
verification ladder T0 review T1 audit T2 compute T3 formal

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The Fornax galaxy cluster was observed with the High Energy Stereoscopic System (H.E.S.S.) for a total live time of 14.5 hours, searching for very-high-energy (VHE, E>100 GeV) gamma-rays from dark matter (DM) annihilation. No significant signal was found in searches for point-like and extended emissions. Using several models of the DM density distribution, upper limits on the DM velocity-weighted annihilation cross-section <sigma v> as a function of the DM particle mass are derived. Constraints are derived for different DM particle models, such as those arising from Kaluza-Klein and supersymmetric models. Various annihilation final states are considered. Possible enhancements of the DM annihilation gamma-ray flux, due to DM substructures of the DM host halo, or from the Sommerfeld effect, are studied. Additional gamma-ray contributions from internal bremsstrahlung and inverse Compton radiation are also discussed. For a DM particle mass of 1 TeV, the exclusion limits at 95% of confidence level reach values of <sigma v> ~ 10^-23cm^3s^-1, depending on the DM particle model and halo properties. Additional contribution from DM substructures can improve the upper limits on <\sigma v> by more than two orders of magnitude. At masses around 4.5 TeV, the enhancement by substructures and the Sommerfeld resonance effect results in a velocity-weighted annihilation cross-section upper limit at the level of <\sigma v> ~ 10^-26cm^3s^-1.

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