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The local dark matter density from SDSS-SEGUE G-dwarfs
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
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Number of Authors: 52018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 478, no 2, p. 1677-1693Article in journal (Refereed) Published
Abstract [en]

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 Budenbender 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 alpha-young population from Budenbender et al. yields the most reliable result of rho(dm) = 0.46(-0.08)(+ 0.07) GeV cm(-3) = 0.012(-0.002)(+ 0.002) M-circle dot pc(-3). Our analyses yield inconsistent results for the alpha-young and alpha-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.

Place, publisher, year, edition, pages
2018. Vol. 478, no 2, p. 1677-1693
Keywords [en]
Galaxy: disc, Galaxy: kinematics and dynamics, dark matter
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-159014DOI: 10.1093/mnras/sty977ISI: 000439547400018OAI: oai:DiVA.org:su-159014DiVA, id: diva2:1246725
Available from: 2018-09-10 Created: 2018-09-10 Last updated: 2018-09-10Bibliographically approved

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Sivertsson, Sofia
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