Implications for constrained supersymmetry of combined HESS observations of dwarf galaxies, the Galactic halo and the Galactic Centre
2011 (English)In: Journal of Cosmology and Astroparticle Physics, ISSN 1475-7516, no 11, 4- p.Article in journal (Refereed) Published
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 including combined observations of the Sagittarius. Carina and Sculptor dwarf galaxies strongly disfavour the coannihilation region of the CMSSM and models with large annihilation cross-sections. Without the Sagittarius dwarf, which admittedly has a rather uncertain dark matter profile, the results are similar, but weaker. The Galactic Centre search is complicated by a strong (unknown) gamma-ray source, and we see no significant effect on the CMSSM parameter space when assuming a realistic Galactic Centre DM density profile.
Place, publisher, year, edition, pages
2011. no 11, 4- p.
supersymmetry and cosmology, dark matter theory, gamma ray experiments, dwarfs galaxies
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:su:diva-74047DOI: 10.1088/1475-7516/2011/11/004ISI: 000298141300004OAI: oai:DiVA.org:su-74047DiVA: diva2:506679
authorCount :32012-02-292012-02-282012-02-29Bibliographically approved