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dc.contributor.authorAbramowski, A.
dc.contributor.authorBüsching, I.
dc.contributor.authorDe Jager, O.C.
dc.contributor.authorVenter, C.
dc.contributor.authorVorster, M.
dc.date.accessioned2012-09-05T14:44:37Z
dc.date.available2012-09-05T14:44:37Z
dc.date.issued2011
dc.identifier.citationAbramowski, A. et al. 2011. H.E.S.S. constraints on dark matter annihilations towards the Sculptor and Carina dwarf galaxies. Astroparticle physics, 34(8):608-616. [http://www.journals.elsevier.com/astroparticle-physics]en_US
dc.identifier.issn0927-6505
dc.identifier.issn1873-2852 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/7243
dc.identifier.urihttp://dx.doi.org/10.1016/j.astropartphys.2010.12.006
dc.identifier.urihttp://ac.els-cdn.com/S0927650510002410/1-s2.0-S0927650510002410-main.pdf?_tid=8b6d08f4-f73e-11e1-a89d-00000aacb361&acdnat=1346838559_75709ebb186e045770ce62614b4926c0
dc.description.abstractThe 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.en_US
dc.language.isoenen_US
dc.publisherElsevier Scienceen_US
dc.subjectGamma-rays: observations – Dwarf spheroidal galaxyen_US
dc.subjectdark matteren_US
dc.subjectSommerfeld enhancementen_US
dc.subjectinternal Bremstrahlungen_US
dc.subjectSculptoren_US
dc.subjectCarinaen_US
dc.titleH.E.S.S. constraints on dark matter annihilations towards the Sculptor and Carina dwarf galaxiesen_US
dc.typeArticleen_US
dc.contributor.researchID12006653 - Venter, Christo


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