TRIGONOMETRIC PARALLAXES OF HIGH MASS STAR FORMING REGIONS: THE STRUCTURE AND KINEMATICS OF THE MILKY WAY
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Over 100 trigonometric parallaxes and proper motions for masers associated with young, high-mass stars have been measured with the Bar and Spiral Structure Legacy Survey, a Very Long Baseline Array key science project, the European VLBI Network, and the Japanese VLBI Exploration of Radio Astrometry project. These measurements provide strong evidence for the existence of spiral arms in the Milky Way, accurately locating many arm segments and yielding spiral pitch angles ranging from about 7° to 20°. The widths of spiral arms increase with distance from the Galactic center. Fitting axially symmetric models of the Milky Way with the three-dimensional position and velocity information and conservative priors for the solar and average source peculiar motions, we estimate the distance to the Galactic center, R 0 , to be 8.34 ± 0.16 kpc, a circular rotation speed at the Sun, Θ 0 , to be 240 ± 8 km s −1 , and a rotation curve that is nearly flat (i.e., a slope of −0.2 ± 0.4 km s −1 kpc −1 ) between Galactocentric radii of ≈5 and 16 kpc. Assuming a "universal" spiral galaxy form for the rotation curve, we estimate the thin disk scale length to be 2.44 ± 0.16 kpc. With this large data set, the parameters R 0 and Θ 0 are no longer highly correlated and are relatively insensitive to different forms of the rotation curve. If one adopts a theoretically motivated prior that high-mass star forming regions are in nearly circular Galactic orbits, we estimate a global solar motion component in the direction of Galactic rotation, V ☉ = 14.6 ± 5.0 km s −1 . While Θ 0 and V ☉ are significantly correlated, the sum of these parameters is well constrained, Θ 0 + V ☉ = 255.2 ± 5.1 km s −1 , as is the angular speed of the Sun in its orbit about the Galactic center, (Θ 0 + V ☉ )/ R 0 = 30.57 ± 0.43 km s −1 kpc −1 . These parameters improve the accuracy of estimates of the accelerations of the Sun and the Hulse–Taylor binary pulsar in their Galactic orbits, significantly reducing the uncertainty in tests of gravitational radiation predicted by general relativity.
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The BeSSeL (Reid et al., 2014) and VERA (Honma et al., 2012) surveys have used ∼100 masers to constrain R⊙ = 8.34 ± 0.16 kpc and vc(R0) = 240 ± 8 km s^-1.
“The BeSSeL (Reid et al., 2014) and VERA (Honma et al., 2012) surveys have used ∼ 100 masers to constrain R ⊙ = 8 . 34 ± 0 . 16 kpc and vc ( R 0 ) = 240 ± 8 km s -1 .”
From The rotation curve of the Milky Way: State of the art, the Keplerian decline debate, and implications for dark matter (2026) · cites this paper as Reid et al., 2014
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Shiozaki, S., Imai, H., Tafoya, D., Omodaka, T., Hirota, T., Honma, M., Matsui, M., & Ueno, Y. (2011) · Publications of the Astronomical Society of Japan · doi:10.1093/pasj/63.6.1219 · Cited by 21 · see citing works
Flagged first, then by citations
Research works printed but not linked: 4
- Benjamin, R. A. 2008, in ASP Conf. Ser. 387, Massive Star Formation: Observations Confront Theory, ed. H. Beuther, H. Linz, & Th. Henning (San Francisco, CA: ASP), 375
- Do, T., Martinez, G. D., Yelda, S., et al. 2013, ApJL, 779, L6 · DOI
- Reid, M. J. 1993, ARA&A, 31, 345 · DOI
- Sivia, D., & Skilling, J. 2006, Data Analysis: A Bayesian Tutorial (2nd ed.; New York: Oxford Univ. Press), 168
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 · see citing works
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 · see citing works
A geometric distance measurement to the Galactic center black hole with 0.3% uncertainty
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Trigonometric Parallaxes of High-mass Star-forming Regions: Our View of the Milky Way
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Self-citationThe Circular Velocity Curve of the Milky Way from 5 to 25 kpc
Eilers, A.-C., Hogg, D. W., Rix, H.-W., & Ness, M. K. (2019) · The Astrophysical Journal · doi:10.3847/1538-4357/aaf648 · Cited by 404 · see citing works
Portail, M., Gerhard, O., Wegg, C., & Ness, M. (2017) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stw2819 · Cited by 378 · see citing works
Haywood, M., Di Matteo, P., Lehnert, M. D., Snaith, O., Khoperskov, S., & Gómez, A. (2018) · The Astrophysical Journal · doi:10.3847/1538-4357/aad235 · Cited by 360 · see citing works
Laporte, C. F. P., Johnston, K. V., Gómez, F. A., Garavito-Camargo, N., & Besla, G. (2018) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/sty1574 · Cited by 230 · see citing works
Di Matteo, P., Haywood, M., Lehnert, M. D., Katz, D., Khoperskov, S., Snaith, O. N., Gómez, A., & Robichon, N. (2019) · Astronomy & Astrophysics · doi:10.1051/0004-6361/201834929 · Cited by 222 · see citing works
ON THE SHOULDERS OF GIANTS: PROPERTIES OF THE STELLAR HALO AND THE MILKY WAY MASS DISTRIBUTION
Kafle, P. R., Sharma, S., Lewis, G. F., & Bland-Hawthorn, J. (2014) · The Astrophysical Journal · doi:10.1088/0004-637x/794/1/59 · Cited by 215 · see citing works
Star formation rates and efficiencies in the Galactic Centre
Barnes, A. T., Longmore, S. N., Battersby, C., Bally, J., Kruijssen, J. M. D., Henshaw, J. D., & Walker, D. L. (2017) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/stx941 · Cited by 193 · see citing works
Evidence for dark matter in the inner Milky Way
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The fraction of dark matter within galaxies from the IllustrisTNG simulations
Lovell, M. R., Pillepich, A., Genel, S., Nelson, D., Springel, V., Pakmor, R., Marinacci, F., Weinberger, R., Torrey, P., Vogelsberger, M., et al. (2018) · Monthly Notices of the Royal Astronomical Society · doi:10.1093/mnras/sty2339 · Cited by 149 · see citing works
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Melchiorri, A., & Ruchika (2026) · New Astronomy Reviews · doi:10.1016/j.newar.2026.101758
- Authors
- Reid, M. J., Menten, K. M., Brunthaler, A., Zheng, X. W., Dame, T. M., Xu, Y., Wu, Y., Zhang, B., Sanna, A., Sato, M., Hachisuka, K., Choi, Y. K., Immer, K., Moscadelli, L., Rygl, K. L. J., & Bartkiewicz, A.
- Affiliations
- Center for Astrophysics Harvard & Smithsonian (US)
- Max Planck Institute for Radio Astronomy (DE)
- Nanjing University (CN)
- Chinese Academy of Sciences (CN)
- Shanghai Astronomical Observatory (CN)
- Arcetri Astrophysical Observatory (IT)
- European Space Agency (FR)
- Nicolaus Copernicus University (PL)
- ORCID
- Rygl, K. L. J.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 2014-02-24
- Volume
- 783
- Issue
- 2
- Pages
- 130
- ISSN
- 0004-637X (ISSN-L)
- 1538-4357
- OpenAlex
- W1974878478
- Cited by
- 1,379
- References
- 81
- Citations by year
- 2026: 49 · 2025: 94 · 2024: 77 · 2023: 90 · 2022: 92 · 2021: 111 · 2020: 135 · 2019: 151 · 2018: 148 · 2017: 153 · 2016: 121 · 2015: 109 · 2014: 48 · 2013: 1
- FWCI
- 77.39
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- The Astrophysical Journal (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysics and Star Formation Studies
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
- Keywords
- stellar parallax, masers, massive star-forming regions, Milky Way spiral structure, spiral arms, galactocentric distance, galaxy rotation curves, solar motion, proper motions, Hulse-Taylor binary pulsar, galactic kinematics, axisymmetric model, radio astrometry
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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