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The Galaxy in Context: Structural, Kinematic, and Integrated Properties
Open accessAbstract
Our Galaxy, the Milky Way, is a benchmark for understanding disk galaxies. It is the only galaxy whose formation history can be studied using the full distribution of stars from faint dwarfs to supergiants. The oldest components provide us with unique insight into how galaxies form and evolve over billions of years. The Galaxy is a luminous (L⋆) barred spiral with a central box/peanut bulge, a dominant disk, and a diffuse stellar halo. Based on global properties, it falls in the sparsely populated “green valley” region of the galaxy color-magnitude diagram. Here we review the key integrated, structural and kinematic parameters of the Galaxy, and point to uncertainties as well as directions for future progress. Galactic studies will continue to play a fundamental role far into the future because there are measurements that can only be made in the near field and much of contemporary astrophysics depends on such observations.
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“Before Gaia , these challenges meant that the MW virial mass was known only to within a factor of several-(0 . 53) × 10 12 M ⊙ (Bland-Hawthorn & Gerhard, 2016)-despite decades of effort.”
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 Bland-Hawthorn & Gerhard, 2016
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“Currently, the stellar disc mass of our galaxy is poorly constrained (e.g. see the compilation of stellar profiles in Iocco et al. 2015) and thus cannot be used to distinguish between the two models, although most measurements agree better with the lower stellar mass of the contracted NFW halo model”
From The milky way total mass profile as inferred from Gaia DR2 (2020) · cites this paper as Bland-Hawthorn & Gerhard 2016
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“The total baryonic mass of the MW is M bary ≈ (0 . 6-1 . 0) × 10 11 M ⊙ (Bland-Hawthorn & Gerhard, 2016).”
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 Bland-Hawthorn & Gerhard, 2016
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“The Milky Way is, in general terms, a fairly typical disk galaxy (Bland-Hawthorn & Gerhard 2016).”
From Streams, Substructures, and the Early History of the Milky Way (2020) · cites this paper as Bland-Hawthorn & Gerhard 2016
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Cited by
Sorted by citations
Prusti, T., de Bruijne, J. H. J., Brown, A. G. A., Vallenari, A., Babusiaux, C., Bailer‐Jones, C. A. L., Bastian, U., Biermann, M., Evans, D. W., Eyer, L., et al. (2016) · Astronomy and Astrophysics · doi:10.1051/0004-6361/201629272 · Cited by 7,350
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Small-Scale Challenges to the Λ CDM Paradigm
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Metadata
- Authors
- Bland-Hawthorn, J., & Gerhard, O.
- Affiliations
- 1Sydney Institute for Astronomy, School of Physics, University of Sydney, New South Wales 2006, Australia; email: jbh@physics.usyd.edu.au
- Max Planck Institute for Extraterrestrial Physics (DE)
- Corresponding author
- Gerhard, Ortwin
- ORCID
- Gerhard, Ortwin
- Venue
- Annual Review of Astronomy and Astrophysics
- Publisher
- Annual Reviews
- Published
- 2016-09-19
- Volume
- 54
- Issue
- 1
- Pages
- 529-596
- ISSN
- 0066-4146 (ISSN-L)
- 1545-4282
- OpenAlex
- W2216753448
- Cited by
- 1,656
- References
- 584
- Citations by year
- 2026: 119 · 2025: 187 · 2024: 181 · 2023: 168 · 2022: 140 · 2021: 162 · 2020: 203 · 2019: 194 · 2018: 160 · 2017: 109 · 2016: 31
- FWCI
- 11.89
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- Annual Review of Astronomy and Astrophysics (publishedVersion)
- arXiv (Cornell University) (publishedVersion)
- Max Planck Digital Library (submittedVersion)
- MPG.PuRe (Max Planck Society) (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 › Galaxies: Formation, Evolution, Phenomena
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
- Keywords
- Milky Way, disk galaxies, galaxy structure, galactic kinematics, stellar halo, barred spiral galaxies, green valley, galaxy formation and evolution, stellar populations
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