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The dynamical matter density in the solar neighbourhood inferred from Gaia DR1
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).ORCID iD: 0000-0001-5686-3743
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC). Lebniz Institut für Astrophysik Potsdam, Germany.
Number of Authors: 22019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 482, no 1, p. 262-277Article in journal (Refereed) Published
Abstract [en]

We determine the total dynamical density in the solar neighbourhood using the Tycho-Gaia Astrometric Solution catalogue. Astrometric measurements of proper motion and parallax of stars inform us of both the stellar number density distribution and the velocity distribution of stars close to the plane. Assuming equilibrium, these distributions are interrelated through the local dynamical density. For the first time, we do a full joint fit of the velocity and stellar number density distributions while accounting for the astrometric error of individual stars, in the framework of Bayesian hierarchical modelling. We use a sample of stars whose distance extends to approximately 160 pc from the Sun. We find a local matter density of rho(0) = 0.119(-0.012)(+0.015) M-circle dot pc(-3), where the result is presented as the median to the posterior distribution, plus/ minus its 16th and 84th percentiles. We find the Sun's position above the Galactic plane to be z(circle dot) = 15.29(-2.16)(+2.24) pc, and the Sun's velocity perpendicular to the Galactic plane to be W-circle dot = 7.19(-0.18)(+0.18) km s(-1).

Place, publisher, year, edition, pages
2019. Vol. 482, no 1, p. 262-277
Keywords [en]
Galaxy: disc, Galaxy: kinematics and dynamics, Galaxy: structure
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-165794DOI: 10.1093/mnras/sty2400ISI: 000454575300020OAI: oai:DiVA.org:su-165794DiVA, id: diva2:1289791
Available from: 2019-02-19 Created: 2019-02-19 Last updated: 2019-02-19Bibliographically approved

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Widmark, AxelMonari, Giacomo
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