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Cited by 110Dark Matter and Cosmic PhenomenaStellar, planetary, and galactic studiesGalaxies: Formation, Evolution, Phenomena

Using Gaia DR2 to constrain local dark matter density and thin dark disk

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Buch, Jatan, Leung, Shing Chau (John), Fan, JiJi·2019·Journal of Cosmology and Astroparticle Physics
DOI 10.1088/1475-7516/2019/04/026
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Abstract

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.

    “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

    Section 5.3 (p. 18) reports a strong degeneracy between baryon and dark-matter density measurements, supporting the claim that uncertainty about baryons limits local dark-matter estimates. But it says the results are dominated by both that degeneracy and errors from modeling non-equilibrium behavior; it does not identify the poorly known baryonic distribution as the main systematic uncertainty. (LLM, conf=0.84)

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Research works printed but not linked: 4

  1. [7][7] M. Cropper, D. Katz, P. Sartoretti, T. Prusti, J. H. J. de Bruijne, F. Chassat et al., Gaia Radial Velocity Spectrometer , ArXiv e-prints (Apr., 2018) , [ 1804.09369 ]. -
  2. [8][8] D. Katz, P. Sartoretti, M. Cropper, P. Panuzzo, G. M. Seabroke, Y. Viala et al., Gaia Data Release 2: Properties and validation of the radial velocities , ArXiv e-prints (Apr., 2018) , [ 1804.09372 ]. -
  3. [9][9] X. Luri, A. G. A. Brown, L. M. Sarro, F. Arenou, C. A. L. Bailer-Jones, A. Castro-Ginard et al., Gaia Data Release 2: using Gaia parallaxes , ArXiv e-prints (Apr., 2018) , [ 1804.09376 ]. -
  4. [59][59] J. C. Zinn, M. H. Pinsonneault, D. Huber and D. Stello, Confirmation of the zero-point offset in Gaia Data Release 2 parallaxes using asteroseismology and APOGEE spectroscopy in the Kepler field , ArXiv e-prints (May, 2018) , [ 1805.02650 ]. -

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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
DOI
10.1088/1475-7516/2019/04/026
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
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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