Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2010-12-17
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
18 pages, 10 figures Major changes: added H.E.S.S. results on halo and two additional dwarf galaxies, title, abstract and text
Scientific paper
In order to place limits on dark matter (DM) properties using $\gamma$-ray observations, previous analyses have often assumed a very simple parametrisation of the $\gamma$-ray annihilation yield; typically, it has been assumed that annihilation proceeds through a single channel only. In realistic DM models, annihilation may occur into many different final states, making this quite a rough ansatz. With additional processes like virtual internal bremsstrahlung and final state radiation, this ansatz becomes even more incorrect, and the need for scans of explicit model parameter spaces becomes clear. Here we present scans of the parameter space of the Constrained Minimal Supersymmetric Standard Model (CMSSM), considering $\gamma$-ray spectra from three dwarf galaxies, the Galactic Centre region and the broader Galactic halo, as obtained with the High-Energy Stereoscopic System (H.E.S.S.). We present a series of likelihood scans combining the H.E.S.S. data with other experimental results. We show that observations of the Sagittarius, Carina and Sculptor dwarf galaxies disfavour the coannihilation region of the CMSSM and models with large annihilation cross-sections. This is true even under reasonable assumptions about the DM density profiles, and constitutes the strongest constraint to date on coannihilation models within the CMSSM. The Galactic halo has a similar, but weaker, effect. The Galactic Centre search is complicated by a strong (unknown) $\gamma$-ray source, and we see no effect on the CMSSM parameter space when assuming a realistic Galactic Centre DM density profile.
Conrad Jan
Ripken Joachim
Scott Pat
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