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Dwarf spheroidals are low-luminosity satellite galaxies of the Milky Wayhighly dominated by dark matter (DM). Therefore, they are prime targets tosearch for signals from dark matter annihilation using gamma-ray observations.While the typical assumption is that the dark matter density profile of thesesatellite galaxies can be described by a spherical symmetricNavarro-Frenk-White (NFW) profile, recent observational data of stellarkinematics suggest that the DM halos around these galaxies are better describedby axisymmetric profiles. Motivated by such evidence, we analyse about sevenyears of PASS8 Fermi data for seven classical dwarf galaxies, including Draco,adopting both the widely used NFW profile and observationally-motivatedaxisymmetric density profiles. For four of the selected dwarfs (Sextans,Carina, Sculptor and Fornax) axisymmetric mass models suggest a cored densityprofile rather than the commonly adopted cusped profile. We found that upperlimits on the annihilation cross section for some of these dwarfs aresignificantly higher than the ones achieved using an NFW profile. Therefore,upper limits in the literature obtained using spherical symmetric cuspedprofiles, such as the NFW, might be overestimated. Our results show that it isextremely important to use observationally motivated density profiles goingbeyond the usually adopted NFW in order to obtain accurate constraints on thedark matter annihilation cross section.

Impact of axisymmetric mass models for dwarf spheroidal galaxies on indirect dark matter searches