Journal
ASTROPARTICLE PHYSICS
Volume 34, Issue 8, Pages 608-616Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.astropartphys.2010.12.006
Keywords
Gamma-rays: observations - Dwarf spheroidal galaxy; Dark matter; Sculptor; Carina; Sommerfeld enhancement; Internal Bremsstrahlung
Funding
- German Ministry for Education and Research (BMBF)
- Max Planck Society
- French Ministry for Research
- STFC [PP/E001645/2, ST/F002963/1, PP/E001319/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/F002963/1, PP/E001319/1, PP/E001645/2] Funding Source: researchfish
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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 14.811 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 10(-21) cm(3) s(-1) down to similar to 10(-2)2 cm(3) s(-1) 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. (C) 2010 Elsevier B.V. All rights reserved.
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