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Dark Matter distribution in the Milky Way: microlensing and dynamical constraints

Abstract : We show that current microlensing and dynamical observations of the Galaxy permit to set interesting constraints on the Dark Matter local density and profile slope towards the galactic centre. Assuming state-of-the-art models for the distribution of baryons in the Galaxy, we find that the most commonly discussed Dark Matter profiles (viz. Navarro-Frenk-White and Einasto) are consistent with microlensing and dynamical observations, while extreme adiabatically compressed profiles are robustly ruled out. When a baryonic model that also includes a description of the gas is adopted, our analysis provides a determination of the local Dark Matter density, ρ0 = 0.20-0.56 GeV/cm3 at 1σ, that is found to be compatible with estimates in the literature based on different techniques.
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Submitted on : Tuesday, April 19, 2022 - 4:21:11 PM
Last modification on : Wednesday, April 20, 2022 - 3:40:04 AM

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Fabio Iocco, Miguel Pato, Gianfranco Bertone, Philippe Jetzer. Dark Matter distribution in the Milky Way: microlensing and dynamical constraints. JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS, 2011, 2011, ⟨10.1088/1475-7516/2011/11/029⟩. ⟨insu-03645853⟩

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