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Broken degeneracies: the rotation curve and velocity anisotropy of the Milky Way halo
Open accessAbstract
We use distant blue horizontal branch stars with Galactocentric distances 16 < r < 48 kpc as kinematic tracers of the Milky Way dark halo. We model the tracer density as an oblate, power law embedded within a spherical power-law potential. Using a distribution function method, we estimate the overall power-law potential and the velocity anisotropy of the halo tracers. We measure the slope of the potential to be γ∼ 0.4, and the overall mass within 50 kpc is ∼4 × 1011 M⊙. The tracer velocity anisotropy is radially biased with β∼ 0.5, which is in good agreement with local solar neighbourhood studies. Our results provide an accurate outer circular velocity profile for the Milky Way and suggest a relatively high-concentration dark matter halo (cvir∼ 20).
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“Such studies argue that the Galactic halo has a very high concentration, typically ∼ 14 or higher”
From The milky way total mass profile as inferred from Gaia DR2 (2020) · cites this paper as Deason et al. 2012
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Galactic Dynamics: Second Edition
Binney, J., & Tremaine, S. (2008) · doi:10.1515/9781400828722 · Cited by 4,375 · cited 2×
“We model the dynamical properties of the BHB tracers using a distribution function (DF) method (see e.g. Binney & Tremaine 2008 and references therein).”
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- Newberg, 2006, J. Phys. Conf. Ser., 47, 195
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Metadata
- Authors
- Deason, A. J., Belokurov, V., Evans, N. W., & An, J.
- Affiliations
- 1Institute of Astronomy, Madingley Road, Cambridge CB3 0HA
- Chinese Academy of Sciences (CN)
- Venue
- Monthly Notices of the Royal Astronomical Society: Letters
- Publisher
- Oxford University Press (OUP)
- Published
- 2012-07-01
- Volume
- 424
- Issue
- 1
- Pages
- L44-L48
- ISSN
- 1745-3925 (ISSN-L)
- 1745-3933
- OpenAlex
- W1853900401
- Cited by
- 133
- References
- 2
- Citations by year
- 2026: 1 · 2025: 5 · 2024: 4 · 2023: 3 · 2022: 5 · 2021: 4 · 2020: 14 · 2019: 13 · 2018: 9 · 2017: 14 · 2016: 17 · 2015: 14 · 2014: 12 · 2013: 14 · 2012: 4
- FWCI
- 7.71
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Monthly Notices of the Royal Astronomical Society Letters (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- Durham Research Online (Durham University) (submittedVersion, cc-by)
- arXiv (Cornell University)
- Funders
- Science and Technology Facilities Council (ST/H00243X/1, ST/F00723X/1, ST/J001538/1)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
- Keywords
- Milky Way dark matter halo, rotation curves, velocity anisotropy, blue horizontal branch stars, kinematic tracers, power-law potential, halo concentration, circular velocity profiles, solar neighborhood
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