Abstract
We derive the local dark matter density by applying the integrated Jeans equation method from Silverwood et al. to SDSS-SEGUE G-dwarf data processed and presented by Büdenbender et al. We use the MULTINEST Bayesian nested sampling software to fit a model for the baryon distribution, dark matter, and tracer stars, including a model for the ‘tilt term’ that couples the vertical and radial motions, to the data. The α-young population from Büdenbender et al. yields the most reliable result of ρdm = 0.46⁺⁰.⁰²₋₀.₀₈ GeVcm⁻³ = 0.012⁺⁰.⁰⁰²₋₀.₀₀₂ M⊙pc⁻³. Our analyses yield inconsistent results for the α-young and α-old data, pointing to problems in the tilt term and its modelling, the data itself, the assumption of a flat rotation curve, or the effects of disequilibria. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000273029Publication status
publishedExternal links
Journal / series
Monthly Notices of the Royal Astronomical SocietyVolume
Pages / Article No.
Publisher
Oxford University PressSubject
Galaxy: disc; Galaxy: kinematics and dynamics; dark matterNotes
It was possible to publish this article open access thanks to a Swiss National Licence with the publisher.More
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