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Title: Dynamical constraints on the dark matter distribution in the Milky Way

Abstract

An accurate knowledge of the dark matter distribution in the Milky Way is of crucial importance for galaxy formation studies and current searches for particle dark matter. In this paper we set new dynamical constraints on the Galactic dark matter profile by comparing the observed rotation curve, updated with a comprehensive compilation of kinematic tracers, with that inferred from a wide range of observation-based morphologies of the bulge, disc and gas. The generalised Navarro-Frenk-White (NFW) and Einasto dark matter profiles are fitted to the data in order to determine the favoured ranges of local density, slope and scale radius. For a representative baryonic model, a typical local circular velocity v{sub 0}=230 km/s and a distance of the Sun to the Galactic centre R{sub 0}=8 kpc, we find a local dark matter density ρ{sub 0} = 0.420{sup +0.021}{sub −0.018} (2σ) ± 0.025 GeV/cm{sup 3} (ρ{sub 0} = 0.420{sup +0.019}{sub −0.021} (2σ) ± 0.026 GeV/cm{sup 3}) for NFW (Einasto), where the second error is an estimate of the systematic due to baryonic modelling. Apart from the Galactic parameters, the main sources of uncertainty inside and outside the solar circle are baryonic modelling and rotation curve measurements, respectively. Upcoming astronomical observations are expected to reduce all these uncertainties substantially over the coming years.

Authors:
 [1];  [2];  [3]
  1. The Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm (Sweden)
  2. ICTP South American Institute for Fundamental Research, and Instituto de Física Teórica, Universidade Estadual Paulista (UNESP), Rua Dr. Bento Teobaldo Ferraz 271, 01140-070 São Paulo, SP Brazil (Brazil)
  3. GRAPPA Institute, University of Amsterdam, Science Park 904, 1090 GL Amsterdam (Netherlands)
Publication Date:
OSTI Identifier:
22525156
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 12; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BARYONS; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; DENSITY; DIAGRAMS; DISTANCE; GALACTIC EVOLUTION; GEV RANGE; LIMITING VALUES; MILKY WAY; NONLUMINOUS MATTER; ROTATION; SPATIAL DISTRIBUTION; SUN; VELOCITY

Citation Formats

Pato, Miguel, Iocco, Fabio, and Bertone, Gianfranco. Dynamical constraints on the dark matter distribution in the Milky Way. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/12/001.
Pato, Miguel, Iocco, Fabio, & Bertone, Gianfranco. Dynamical constraints on the dark matter distribution in the Milky Way. United States. doi:10.1088/1475-7516/2015/12/001.
Pato, Miguel, Iocco, Fabio, and Bertone, Gianfranco. Tue . "Dynamical constraints on the dark matter distribution in the Milky Way". United States. doi:10.1088/1475-7516/2015/12/001.
@article{osti_22525156,
title = {Dynamical constraints on the dark matter distribution in the Milky Way},
author = {Pato, Miguel and Iocco, Fabio and Bertone, Gianfranco},
abstractNote = {An accurate knowledge of the dark matter distribution in the Milky Way is of crucial importance for galaxy formation studies and current searches for particle dark matter. In this paper we set new dynamical constraints on the Galactic dark matter profile by comparing the observed rotation curve, updated with a comprehensive compilation of kinematic tracers, with that inferred from a wide range of observation-based morphologies of the bulge, disc and gas. The generalised Navarro-Frenk-White (NFW) and Einasto dark matter profiles are fitted to the data in order to determine the favoured ranges of local density, slope and scale radius. For a representative baryonic model, a typical local circular velocity v{sub 0}=230 km/s and a distance of the Sun to the Galactic centre R{sub 0}=8 kpc, we find a local dark matter density ρ{sub 0} = 0.420{sup +0.021}{sub −0.018} (2σ) ± 0.025 GeV/cm{sup 3} (ρ{sub 0} = 0.420{sup +0.019}{sub −0.021} (2σ) ± 0.026 GeV/cm{sup 3}) for NFW (Einasto), where the second error is an estimate of the systematic due to baryonic modelling. Apart from the Galactic parameters, the main sources of uncertainty inside and outside the solar circle are baryonic modelling and rotation curve measurements, respectively. Upcoming astronomical observations are expected to reduce all these uncertainties substantially over the coming years.},
doi = {10.1088/1475-7516/2015/12/001},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 12,
volume = 2015,
place = {United States},
year = {2015},
month = {12}
}