Cited by 413Stellar, planetary, and galactic studiesGalaxies: Formation, Evolution, PhenomenaAstrophysical Phenomena and Observations

THE MILKY WAY'S CIRCULAR-VELOCITY CURVE BETWEEN 4 AND 14 kpc FROM APOGEE DATA

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Bovy, Jo, Allende Prieto, Carlos, Beers, Timothy C., Bizyaev, Dmitry, da Costa, Luiz N., Cunha, Katia, Ebelke, Garrett L., Eisenstein, Daniel J. +25 more·2012·The Astrophysical Journal

Abstract

We measure the Milky Way's rotation curve over the Galactocentric range 4 kpc ≲ R ≲ 14 kpc from the first year of data from the Apache Point Observatory Galactic Evolution Experiment. We model the line-of-sight velocities of 3365 stars in 14 fields with b = 0° between 30° ⩽ l ⩽ 210° out to distances of 10 kpc using an axisymmetric kinematical model that includes a correction for the asymmetric drift of the warm tracer population (σ R ≈ 35 km s −1 ). We determine the local value of the circular velocity to be V c ( R 0 ) = 218 ± 6 km s −1 and find that the rotation curve is approximately flat with a local derivative between −3.0 km s −1 kpc −1 and 0.4 km s −1 kpc −1 . We also measure the Sun's position and velocity in the Galactocentric rest frame, finding the distance to the Galactic center to be 8 kpc < R 0 < 9 kpc, radial velocity V R , ☉ = −10 ± 1 km s −1 , and rotational velocity V ϕ, ☉ = 242 +10 − 3 km s −1 , in good agreement with local measurements of the Sun's radial velocity and with the observed proper motion of Sgr A*. We investigate various systematic uncertainties and find that these are limited to offsets at the percent level, ∼2 km s −1 in V c . Marginalizing over all the systematics that we consider, we find that V c ( R 0 ) < 235 km s −1 at >99 % confidence. We find an offset between the Sun's rotational velocity and the local circular velocity of 26 ± 3 km s −1 , which is larger than the locally measured solar motion of 12 km s −1 . This larger offset reconciles our value for V c with recent claims that V c ≳ 240 km s −1 . Combining our results with other data, we find that the Milky Way's dark-halo mass within the virial radius is ∼8 × 10 11 M ☉ .

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  • This potentially explains why mass estimates based on fitting the rotation curve are systematically lower than determinations based on other methods.

    “This potentially explains why mass estimates based on fitting the rotation curve (e.g. Bovy et al. 2012; Kafle et al. 2014) are systematically lower than determinations based on other methods”

    From The milky way total mass profile as inferred from Gaia DR2 (2020) · cites this paper as Bovy et al. 2012

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Research works printed but not linked: 4

  1. Binney, J., & Tremaine, S. 2008, Galactic Dynamics (2nd ed.; Princeton, NJ: Princeton Univ. Press)
  2. Frinchaboy, P. M. 2008, PhD thesis, Univ.
  3. Kuijken, K., & Tremaine, S. 1991, in Dynamics of Disk Galaxies, ed. B. Sundelius (Göteborg: Göteborg Univ. Press), 257
  4. Schönrich, R. 2012, MNRAS, in press (arXiv:1207.3079) · arXiv

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Authors
Bovy, J., Allende Prieto, C., Beers, T. C., Bizyaev, D., da Costa, L. N., Cunha, K., Ebelke, G. L., Eisenstein, D. J., Frinchaboy, P. M., García Pérez, A. E., Girardi, L., Hearty, F. R., Hogg, D. W., Holtzman, J., Maia, M. A. G., Majewski, S. R., Malanushenko, E., Malanushenko, V., Mészáros, S., Nidever, D. L., O'Connell, R. W., O'Donnell, C., Oravetz, A., Pan, K., Rocha-Pinto, H. J., Schiavon, R. P., Schneider, D. P., Schultheis, M., Skrutskie, M., Smith, V. V., Weinberg, D. H., Wilson, J. C., & Zasowski, G.
Affiliations
  • Institute for Advanced Study (US)
  • Joint Institute for Nuclear Astrophysics (US)
  • Center for Astrophysics Harvard & Smithsonian (US)
  • Texas Christian University (US)
  • Laboratório Interinstitucional de e-Astronomia (BR)
  • University of Virginia (US)
  • Max Planck Institute for Astronomy (DE)
  • New Mexico State University (US)
  • National Observatory (BR)
  • Universidad de La Laguna (ES)
  • International Gemini Observatory (US)
  • Pennsylvania State University (US)
  • Centre National de la Recherche Scientifique (FR)
  • The Ohio State University (US)
Corresponding author
Bovy, Jo
Venue
The Astrophysical Journal
Published
2012-10-29
Volume
759
Issue
2
Pages
131
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
OpenAlex
W2059104746
Cited by
413
References
93
Citations by year
2026: 11 · 2025: 22 · 2024: 17 · 2023: 27 · 2022: 22 · 2021: 24 · 2020: 24 · 2019: 27 · 2018: 31 · 2017: 36 · 2016: 42 · 2015: 40 · 2014: 49 · 2013: 36 · 2012: 5
FWCI
22.77
Type
journal article
Language
en
Open access
Locations
  • The Astrophysical Journal (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • HAL (submittedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
  • arXiv (Cornell University)
Funders
  • National Science Foundation (0822648, 0216783)
  • U.S. Department of Energy
  • National Aeronautics and Space Administration (NAS 526555)
  • Alfred P. Sloan Foundation
  • Yale University
  • Vanderbilt University
  • Princeton University
  • Ohio State University
  • California Institute of Technology
  • Harvard University
  • University of Washington (08-22648)
  • Johns Hopkins University
  • Carnegie Mellon University
  • University of Portsmouth
  • New Mexico State University
  • Space Telescope Science Institute (NAS5- 26555, 26555)
  • York University
  • Deutsche Forschungsgemeinschaft
  • Office of Science
  • Jet Propulsion Laboratory
  • College of Engineering, Michigan State University
  • University of California, Los Angeles
  • Brookhaven National Laboratory
  • Lawrence Berkeley National Laboratory
Topics
  • 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
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
Keywords
Milky Way rotation curve, circular velocity, APOGEE, galactocentric distance, asymmetric drift, halo mass, solar motion

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