期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 478, 期 2, 页码 1677-1693出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty977
关键词
Galaxy: disc; Galaxy: kinematics and dynamics; dark matter
资金
- Swedish Research Council (VR) [350-2012-268, 638-2013-8993]
- Ministerio de Economia, Industria y Competitividad (MINECO) - Fondo Europeo de Desarrollo Regional (FEDER) through ICCUB (Unidad de Excelencia 'Maria de Maeztu') [MDM-2014-0369]
- Science and Technology Facilities Council (STFC) [ST/M000990/1]
- Mobilising European Research in Astrophysics and Cosmology (MERAC) Foundation
- European Research Council (ERC)
- STFC [ST/M000990/1] Funding Source: UKRI
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.
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