Broken degeneracies: the rotation curve and velocity anisotropy of the Milky Way halo
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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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Most studies that assume an NFW profile for the Galactic halo argue that the halo has a very high concentration, typically ∼14 or higher.
“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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Predictably missing satellites: subhalo abundances in Milky Way-like haloes
Fielder, C. E., Mao, Y.-Y., Newman, J. A., Zentner, A. R., & Licquia, T. C. (2019) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stz1098 · Cited by 31 · see citing works
HUNTING THE MOST DISTANT STARS IN THE MILKY WAY: METHODS AND INITIAL RESULTS
Bochanski, J. J., Willman, B., West, A. A., Strader, J., & Chomiuk, L. (2014) · The Astronomical Journal · doi:10.1088/0004-6256/147/4/76 · Cited by 30 · see citing works
ISOTROPIC AT THE BREAK? 3D KINEMATICS OF MILKY WAY HALO STARS IN THE FOREGROUND OF M31
Cunningham, E. C., Deason, A. J., Guhathakurta, P., Rockosi, C. M., van der Marel, R. P., Toloba, E., Gilbert, K. M., Sohn, S. T., & Dorman, C. E. (2016) · The Astrophysical Journal · doi:10.3847/0004-637x/820/1/18 · Cited by 29 · see citing works
Self-citationThe Milky Way's Circular Velocity Curve and Its Constraint on the Galactic Mass with RR Lyrae Stars
Ablimit, I., & Zhao, G. (2017) · The Astrophysical Journal · doi:10.3847/1538-4357/aa83b2 · Cited by 28 · see citing works
SPITZER , GAIA , AND THE POTENTIAL OF THE MILKY WAY
Price-Whelan, A. M., & Johnston, K. V. (2013) · The Astrophysical Journal Letters · doi:10.1088/2041-8205/778/1/l12 · Cited by 27 · see citing works
What to expect from dynamical modelling of galactic haloes – II. The spherical Jeans equation
Wang, W., Han, J., Cole, S., More, S., Frenk, C. S., & Schaller, M. (2018) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/sty706 · Cited by 27 · see citing works
Decaying dark matter: the case for a deep X-ray observation of Draco
Lovell, M. R., Bertone, G., Boyarsky, A. M., Jenkins, A. R., & Oleg Ruchayskiy, C. (2015) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stv963 · Cited by 26 · see citing works
Shen, X., Xiao, H., Hopkins, P. F., & Zurek, K. M. (2024) · The Astrophysical Journal · doi:10.3847/1538-4357/ad12c6 · Cited by 25 · see citing works
THE CONNECTION BETWEEN THE HOST HALO AND THE SATELLITE GALAXIES OF THE MILKY WAY
Lu, Y., Benson, A., Mao, Y.-Y., Tonnesen, S. K., Peter, A. H. G., Wetzel, A. R., Boylan-Kolchin, M., & Wechsler, R. H. (2016) · The Astrophysical Journal · doi:10.3847/0004-637x/830/2/59 · Cited by 24 · see citing works
The effect of tides on the Sculptor dwarf spheroidal galaxy
Iorio, G., Nipoti, C., Battaglia, G., & Sollima, A. (2019) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stz1342 · Cited by 24 · see citing works
The orbital phase space of contracted dark matter haloes
Callingham, T. M., Cautun, M., Deason, A. J., Frenk, C. S., Grand, R. J. J., Marinacci, F., & Pakmor, R. (2020) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/staa1089 · Cited by 23 · see citing works
Self-citationLiu, G., Huang, Y., Bird, S., Zhang, H., Wang, F., & Tian, H. (2022) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stac2666 · Cited by 23 · see citing works
THE MOST DISTANT STARS IN THE MILKY WAY
Bochanski, J. J., Willman, B., Caldwell, N., Sanderson, R. E., West, A. A., Strader, J., & Brown, W. R. (2014) · The Astrophysical Journal Letters · doi:10.1088/2041-8205/790/1/l5 · Cited by 23 · see citing works
Nashimoto, M., Tanaka, M., Chiba, M., Hayashi, K., Komiyama, Y., & Okamoto, T. (2022) · The Astrophysical Journal · doi:10.3847/1538-4357/ac83a4 · Cited by 20 · see citing works
What to expect from dynamical modelling of galactic haloes
Wang, W., Han, J., Cole, S., Frenk, C. S., & Sawala, T. (2017) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stx1334 · Cited by 20 · see citing works
- 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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