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The localdark matter density from SDSS-SEGUE G-dwarfs

Sivertsson, S, Silverwood, H, Read, J I, Bertone, G and Steger, P (2018) The localdark matter density from SDSS-SEGUE G-dwarfs Monthly Notices of the Royal Astronomical Society, 478 (2). pp. 1677-1693.

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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 ρ_dm= 0.46^{+0.07}_{-0.08} {GeV cm}^{-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.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Sivertsson, S
Silverwood, H
Read, J Ij.read@surrey.ac.uk
Bertone, G
Steger, P
Date : 21 April 2018
Funders : Science and Technology Facilities Council (STFC)
DOI : 10.1093/mnras/sty977
Copyright Disclaimer : © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/about_us/legal/notices) This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record S Sivertsson, H Silverwood, J I Read, G Bertone, P Steger; The localdark matter density from SDSS-SEGUE G-dwarfs, Monthly Notices of the Royal Astronomical Society, Volume 478, Issue 2, 1 August 2018, Pages 1677–1693, https://doi.org/10.1093/mnras/sty977 is available online at: https://academic.oup.com/mnras/article/478/2/1677/4980949 .
Uncontrolled Keywords : Galaxy: disc; Galaxy: kinematics and dynamics; Dark matter; Astrophysics - Astrophysics of Galaxies; High Energy Physics - Phenomenology
Depositing User : Clive Harris
Date Deposited : 20 Sep 2018 15:07
Last Modified : 11 Dec 2018 11:24
URI: http://epubs.surrey.ac.uk/id/eprint/849382

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