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HESS constraints on dark matter annihilations towards the sculptor and carina dwarf galaxies
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-9769-8016
2011 (English)In: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 34, no 8, 608-616 p.Article in journal (Refereed) Published
Abstract [en]

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 <sigma v > 10(-21) cm(3) s(-1) down to <sigma v > 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.

Place, publisher, year, edition, pages
2011. Vol. 34, no 8, 608-616 p.
Keyword [en]
Gamma-rays: observations - Dwarf spheroidal galaxy, Dark matter, Sculptor, Carina, Sommerfeld enhancement, Internal Bremsstrahlung
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:kth:diva-32690DOI: 10.1016/j.astropartphys.2010.12.006ISI: 000288930200004ScopusID: 2-s2.0-79351470152OAI: diva2:411422
QC 20110418Available from: 2011-04-18 Created: 2011-04-18Bibliographically approved

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Ryde, Felix
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