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


Iocco, F; Pato, M; Bertone, G; Jetzer, P (2011). Dark Matter distribution in the Milky Way: microlensing and dynamical constraints. Journal of Cosmology and Astroparticle Physics, (11):029 .

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.

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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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Institute for Computational Science
Dewey Decimal Classification:530 Physics
Language:English
Date:November 2011
Deposited On:18 Feb 2012 21:06
Last Modified:05 Apr 2016 15:20
Publisher:Institute of Physics Publishing
ISSN:1475-7516
Additional Information:This is an author-created, un-copyedited version of an article accepted for publication in Journal of Cosmology and Astroparticle Physics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at 10.1088/1475-7516/2011/11/029
Publisher DOI:10.1088/1475-7516/2011/11/029
Related URLs:http://arxiv.org/abs/1107.5810
Permanent URL: http://doi.org/10.5167/uzh-54440

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