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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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Research works printed but not linked: 1
- Newberg, 2006, J. Phys. Conf. Ser., 47, 195
Cited by
Sorted by citations
The Galaxy in Context: Structural, Kinematic, and Integrated Properties
Bland-Hawthorn, J., & Gerhard, O. (2016) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev-astro-081915-023441 · Cited by 1,656
The mass distribution and gravitational potential of the Milky Way
McMillan, P. J. (2017) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stw2759 · Cited by 1,099
“Deason et al.(2012) and Xue et al. (2008) used samples of blue horizontal branch stars to determine the mass contained within 50 and 60 kpc (respectively).”
MethodCo-formation of the disc and the stellar halo★
Belokurov, V, Erkal, D., Evans, N. W., Koposov, S. E., & Deason, A. J. (2018) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/sty982 · Cited by 1,020
Self-citationON THE LOCAL DARK MATTER DENSITY
Bovy, J., & Tremaine, S. D. (2012) · The Astrophysical Journal · doi:10.1088/0004-637x/756/1/89 · Cited by 399
The total mass of the Large Magellanic Cloud from its perturbation on the Orphan stream
Erkal, D., Belokurov, V. A., Laporte, C. F. P., Koposov, S. E., Li, T. S., Grillmair, C. J., Kallivayalil, N., Price-Whelan, A. M., Evans, N. W., Hawkins, K., et al. (2019) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stz1371 · Cited by 391
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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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