H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies

Hess, Collaboration; de Almeida, U. Barres; Abramowski, A.; Drury, Loc O.-'.-C; Acero, F.; De Oña Wilhelmi, E.; Aharonian, F.; Frster, A.; Akhperjanian, Ag G.; Barres de Almeida, U.; De Jager, Ocker Cornelis; Anton, G.; Barnacka, A.; Behera, B.; Katarzyski, K.; Bazer-Bachi, Ar R.; Bernlöhr, K.; Becherini, Yvonne; Bochow, A.; Boisson, C.; Becker, J.; Bolmont, J.; Bordas, P.; Borrel, V.; Brucker, J.; De Los Reyes, R.; Brun, F.; Brun, P.; Bulik, T.; Büsching, Ingo; Degrange, B.; Carrigan, S.; Casanova, S.; Deil, C.; Dickinson, Hj J.; Cerruti, M.; Djannati-Ataï, A.; Chadwick, Pm M.; Domainko, W.; Charbonnier, A.; Drury, L. O.-'.-C C.; Chaves, Rcg C. G.; Dubois, F.; Dubus, G.; Cheesebrough, A.; Dyks, J.; Chounet, L.-M.; Dyrda, M.; Clapson, Ac C.; Egberts, K.; Coignet, G.; Eger, P.; Conrad, J.; Espigat, P.; Stawarz, Ł.; Dalton, M.; Fallon, L.; Daniel, Mk K.; Farnier, C.; Davids, Id D.; Fegan, S.; Feinstein, F.; Fernandes, Mv V.; Fiasson, A.; Fontaine, G.; Förster, A.; Füßling, M.; Gallant, Ya A.; Gast, H.; Gérard, L.; Gerbig, D.; Giebels, B.; Glicenstein, Jf F.; Glück, B.; Goret, P.; Kluniak, W.; Göring, D.; Hague, J. D.; Hampf, D.; Hauser, M.; Heinz, S.; Heinzelmann, G.; Henri, G.; Hermann, G.; Hinton, Ja A.; Hoffmann, A.; Hofmann, W.; Hofverberg, P.; Horns, D.; Jacholkowska, A.; de Jager, O. C.; Jahn, C.; Jamrozy, M.; Jung, I.; Kastendieck, M. A.; Katarzyński, K.; Wilhelmi, E. De Oña; Katz, U.; Kaufmann, S.; Keogh, D.; Kerschhaggl, M.; Khangulyan, D.; Khélifi, B.; Klochkov, D.; Kluźniak, W.; Kneiske, T.; Komin, Nu-U.; Kosack, K.; Kossakowski, R.; Laffon, H.; Lamanna, G.; Lennarz, D.; Lohse, T.; Lopatin, A.; Lu, C.-C.; Marandon, V.; Marcowith, A.; Masbou, J.; Maurin, D.; Maxted, N.; McComb, Tjl J. L.; Medina, Mc C.; Méhault, J.; Moderski, R.; Moulin, E.; Naumann, Cl L.; Naumann-Godo, M.; de Naurois, M.; Nedbal, D.; Nekrassov, D.; Nguyen, N.; Nicholas, B.; Niemiec, J.; Nolan, Sj J.; Ohm, S.; Olive, J.-F.; Pedaletti1, G.; Opitz, B.; Ostrowski, M.; Panter, M.; Paz Arribas, M.; Pedaletti, G.; Pelletier, G.; Petrucci, P.-O.; Pita, S.; Pühlhofer, G.; Punch, M.; Quirrenbach, A.; Raue, M.; Reyes, R. De Los; Rayner, Sm M.; Reimer, A.; Reimer, O.; Renaud, M.; Rieger, F.; Ripken, J.; Rob, L.; Rosier-Lees, S.; Schoeck, F. M.; Rowell, G.; Rudak, B.; Rulten, Cb B.; Ruppel, J.; Ryde, F.; Sahakian, V.; Santangelo, A.; Schlickeiser, R.; Schöck, Fm M.; Schönwald, A.; Schwanke, U.; Schwarzburg, S.; Stawarz, L.; Schwemmer, S.; Shalchi, A.; Sikora, M.; Skilton, Jl L.; Sol, H.; Spengler, G.; Voelk, H. J.; Steenkamp, R.; Stegmann, C.; Stinzing, F.; Sushch, I.; Szostek, A.; Oc, De Jager; Tavernet, J.-P.; Terrier, R.; Tibolla, O.; Tluczykont, M.; Valerius, K.; van Eldik, C.; Vasileiadis, G.; Collaboration, H. E. S. S.; Venter, Christo; Vialle, Jp P.; Viana, A.; Vincent, P.; Vivier, M.; Völk, Hj J.; Volpe, F.; Vorobiov, S.; Vorster, Michael Johannes; Wagner, Sj J.; Ward, M.; Wierzcholska, A.; Zajczyk, A.; Zdziarski, Aa A.; Zech, A.; De, E.; Zechlin, H.-S.; Arribas, M. Paz

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Elsevier, Astroparticle Physics, 8(34), p. 608-616

DOI: 10.1016/j.astropartphys.2010.12.006

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H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies

Journal article published in 2010 by Collaboration Hess, U. Barres de Almeida, A. Abramowski, Loc O.-'.-C Drury, F. Acero, E. De Oña Wilhelmi, F. Aharonian, A. Frster, Ag G. Akhperjanian, U. Barres de Almeida

, Ocker Cornelis De Jager, G. Anton, A. Barnacka, B. Behera, K. Katarzyski and other authors.

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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 h and 14.8 h 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% CL 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 10-13-10-12 cm-2 s-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 σʋ~ 10-21 cm3 s-1 down to σʋ i ~ 10-22 cm3 s-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. ; http://dx.doi.org/10.1016/j.astropartphys.2010.12.006 ; http://ac.els-cdn.com/S0927650510002410/1-s2.0-S0927650510002410-main.pdf?_tid=8b6d08f4-f73e-11e1-a89d-00000aacb361&acdnat=1346838559_75709ebb186e045770ce62614b4926c0

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H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies

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