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Using Gaia DR2 to constrain local dark matter density and thin dark disk
Open accessAbstract
We use stellar kinematics from the latest Gaia data release (DR2) to measure the local dark matter (DM) density ρ DM in a heliocentric cylinder of radius R = 150 pc and half-height z = 200 pc. We also explore the prospect of using our analysis to estimate the DM density in local substructure by setting constraints on the surface density and scale height of a thin dark disk aligned with the baryonic disk and formed due to dissipative dark matter self-interactions. Performing the statistical analysis within a Bayesian framework for three types of tracers, we obtain ρ DM = 0.016 ± 0.010 M ⊙ /pc 3 for A stars; early G stars give a similar result, while F stars yield a significantly higher value. For a thin dark disk, A stars set the strongest constraint: excluding surface densities (5–12) M ⊙ /pc 2 for scale heights below 100 pc with 95% confidence. The upper bound of this constraint implies ≲ 1% of the Milky Way DM mass is present in a dissipative dark sector. Comparing our results with those derived using Tycho-Gaia Astrometric Solution (TGAS) data, we find that the uncertainty in our measurements of the local DM content is dominated by systematic errors that arise from assumptions of our dynamical analysis in the low z region. Furthermore, there will only be a marginal reduction in these uncertainties with more data in the Gaia era. We comment on the robustness of our method and discuss potential improvements for future work.
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“This result supports previous studies that have found that the poorly known baryonic distribution in the MW is the main systematic uncertainty in the determination of the local DM density”
From The milky way total mass profile as inferred from Gaia DR2 (2020) · cites this paper as Buch et al. 2019
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Metadata
- Authors
- Buch, J., Leung, S. C. (., & Fan, J.
- Affiliations
- Brown University (US)
- ORCID
- Buch, Jatan
- Venue
- Journal of Cosmology and Astroparticle Physics
- Publisher
- IOP Publishing
- Published
- 2019-04-15
- Volume
- 2019
- Issue
- 04
- Pages
- 026-026
- ISSN
- 1475-7508 (ISSN-L)
- 1475-7516
- OpenAlex
- W2886863310
- Cited by
- 110
- References
- 83
- Citations by year
- 2026: 4 · 2025: 7 · 2024: 10 · 2023: 14 · 2022: 18 · 2021: 24 · 2020: 21 · 2019: 12
- FWCI
- 9.73
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Licence
- Locations
- Journal of Cosmology and Astroparticle Physics (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- arXiv (Cornell University)
- Funders
- U.S. Department of Energy (DESC0010010)
- National Aeronautics and Space Administration (80NSSC18K1010)
- Topics
- Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Dark Matter and Cosmic Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Keywords
- local dark matter density, dark matter self-interaction, dissipative dark matter, stellar kinematics, A-type stars, F stars, G stars, dark matter substructure, Milky Way, Gaia DR2, Tycho-Gaia Astrometric Solution, Bayesian analysis, systematic errors
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