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25 April 2024

» arxiv » 1012.5602

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H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies
HESS Collaboration ; A. Abramowski ; F. Acero ; F. Aharonian ; A.G. Akhperjanian ; G. Anton ; A. Barnacka ; U. Barres de Almeida ; A.R. Bazer-Bachi ; Y. Becherini ; J. Becker ; B. Behera ; K. Bernlöhr ; A. Bochow ; C. Boisson ; J. Bolmont ; P. Bordas ; V. Borrel ; 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 ; L.-M. Chounet ; A.C. Clapson ; G. Coignet ; 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 ; F. Dubois ; G. Dubus ; J. Dyks ; M. Dyrda ; K. Egberts ; P. Eger ; P. Espigat ; L. Fallon ; C. Farnier ; S. Fegan ; F. Feinstein ; M.V. Fernandes ; A. Fiasson ; A. Frster ; G. Fontaine ; M. Füßling ; Y.A. Gallant ; H. Gast ; L. Gérard ; D. Gerbig ; B. Giebels ; J.F. Glicenstein ; B. Glück ; P. Goret ; D. Göring ; J.D. Hague ; D. Hampf ; M. Hauser ; S. Heinz ; G. Heinzelmann ; G. Henri ; G. Hermann ; J.A. Hinton ; A. Hoffmann ; W. Hofmann ; P. Hofverberg ; 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 ; M. Kerschhaggl ; 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 ; 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 ; J-F. Olive ; E. de Oña Wilhelmi ; B. Opitz ; M. Ostrowski ; 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 ; F. Ryde ; V. Sahakian ; A. Santangelo ; R. Schlickeiser ; F.M. Schöck ; A. Schönwald ; U. Schwanke ; S. Schwarzburg ; S. Schwemmer ; A. Shalchi ; M. Sikora ; J.L. Skilton ; H. Sol ; G. Spengler ; Ł. Stawarz ; R. Steenkamp ; C. Stegmann ; F. Stinzing ; I. Sushch ; A. Szostek ; J.-P. Tavernet ; R. Terrier ; O. Tibolla ; M. Tluczykont ; K. Valerius ; C. van Eldik ; G. Vasileiadis ; C. Venter ; J.P. Vialle ; A. Viana ; P. Vincent ; M. Vivier ; H.J. Völk ; F. Volpe ; S. Vorobiov ; M. Vorster ; S.J. Wagner ; M. Ward ; A. Wierzcholska ; A. Zajczyk ; A.A. Zdziarski ; A. Zech ; H.-S. Zechlin ;
Date:	27 Dec 2010
Abstract:	The Sculptor and Carina Dwarf spheroidal galaxies were observed with the H.E.S.S. Cherenkov telescope array between January 2008 and December 2009. The data sets consist of a total of 11.8 and 14.8 hours of high quality data, respectively. No gamma-ray signal was detected at the nominal positions of these galaxies above 220 GeV and 320 GeV, respectively. Upper limits on the gamma-ray fluxes at 95% C.L. assuming two forms for the spectral energy distribution (a power law shape and one derived from dark matter annihilation) are obtained at the level of 10^-13 to 10^-12 cm^-2s^-1 in the TeV range. Constraints on the velocity weighted dark matter particle annihilation cross section for both Sculptor and Carina dwarf galaxies range from <sigma v> ~ 10^-21 cm^3s^-1 down to <sigma v> ~ 10^-22 cm^3s^-1 depending on the dark matter halo model used. Possible enhancements of the gamma-ray flux are studied: the Sommerfeld effect, which is found to exclude some dark matter particle masses, the internal Bremsstrahlung and clumps in the dark-matter halo distributions.
Source:	arXiv, 1012.5602
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