Abstract
We derive the mass model of the Milky Way (MW), crucial for Dark Matter (DM) direct and indirectdetection, using recent data and a cored dark matter (DM) halo profile, which is favoured by studiesof external galaxies.The method used consists in fitting a spherically symmetric model of the Galaxy with a Burkert DMhalo profile to available data: MW terminal velocities in the region inside the solar circle,circular velocity as recently estimated from maser star forming regions at intermediate radii, andvelocity dispersions of stellar halo tracers for the outermost Galactic region. The latter arereproduced by integrating the Jeans equation for every modeled mass distribution, and by allowingfor different velocity anisotropies for different tracer populations.For comparison we also consider a Navarro-Frenk-White profile. We find that the cored profile isthe preferred one, with a shallow central density of ρH ∼ 4 × 107M☉/kpc3 and a largecore radius RH ∼ 10 kpc, as observed in external spirals and in agreement with the mass modelunderlying the Universal Rotation Curve of spirals.We describe also the derived model uncertainties, which are crucially driven by the poorlyconstrained velocity dispersion anisotropies of halo tracers.The emerging cored DM distribution has implications for the DM annihilation angular profile, whichis much less boosted in the Galactic center direction with respect to the case of the standardΛCDM, NFW profile. Using the derived uncertainties we discuss finally the limitations andprospects to discriminate between cored and cusped DM profile with a possible observed diffuse DMannihilation signal.The present mass model aims to characterize the present-day description of the distribution ofmatter in our Galaxy, which is needed to frame current crucial issues of Cosmology, Astrophysics andElementary Particles.
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