The power of coordinate transformations in dynamical interpretations of Galactic structure Article Swipe
John Douglas Hunt
,
Kathryn V. Johnston
,
Alex R. Pettitt
,
Emily C. Cunningham
,
Daisuke Kawata
,
David W. Hogg
·
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/staa1987
YOU?
·
· 2020
· Open Access
·
· DOI: https://doi.org/10.1093/mnras/staa1987
Gaia DR2 has provided an unprecedented wealth of information about the positions and motions of stars in our Galaxy and has highlighted the degree of disequilibria in the disc. As we collect data over a wider area of the disc, it becomes increasingly appealing to start analysing stellar actions and angles, which specifically label orbit space, instead of their current phase space location. Conceptually, while $\bar {x}$ and $\bar {v}$ tell us about the potential and local interactions, grouping in action puts together stars that have similar frequencies and hence similar responses to dynamical effects occurring over several orbits. Grouping in actions and angles refines this further to isolate stars that are travelling together through space and hence have shared histories. Mixing these coordinate systems can confuse the interpretation. For example, it has been suggested that by moving stars to their guiding radius, the Milky Way spiral structure is visible as ridge-like overdensities in the Gaia data (Khoperskov et al. 2020). However, in this work, we show that these features are in fact the known kinematic moving groups, both in the Lz − ϕ and the vR − vϕ planes. Using simulations, we show how this distinction will become even more important as we move to a global view of the Milky Way. As an example, we show that the radial velocity wave seen in the Galactic disc in Gaia and APOGEE should become stronger in the action-angle frame, and that it can be reproduced by transient spiral structure.
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- Type
- article
- Language
- en
- Landing Page
- https://doi.org/10.1093/mnras/staa1987
- https://academic.oup.com/mnras/article-pdf/497/1/818/33534016/staa1987.pdf
- OA Status
- bronze
- Cited By
- 18
- References
- 92
- Related Works
- 10
- OpenAlex ID
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https://openalex.org/W3033536702Canonical identifier for this work in OpenAlex
- DOI
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https://doi.org/10.1093/mnras/staa1987Digital Object Identifier
- Title
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The power of coordinate transformations in dynamical interpretations of Galactic structureWork title
- Type
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articleOpenAlex work type
- Language
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enPrimary language
- Publication year
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2020Year of publication
- Publication date
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2020-07-06Full publication date if available
- Authors
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John Douglas Hunt, Kathryn V. Johnston, Alex R. Pettitt, Emily C. Cunningham, Daisuke Kawata, David W. HoggList of authors in order
- Landing page
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https://doi.org/10.1093/mnras/staa1987Publisher landing page
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https://academic.oup.com/mnras/article-pdf/497/1/818/33534016/staa1987.pdfDirect link to full text PDF
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bronzeOpen access status per OpenAlex
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https://academic.oup.com/mnras/article-pdf/497/1/818/33534016/staa1987.pdfDirect OA link when available
- Concepts
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Physics, Milky Way, Stars, Spiral galaxy, Galaxy, Orbit (dynamics), Astrophysics, Spiral (railway), Phase space, Space (punctuation), Action (physics), Astronomy, Aerospace engineering, Thermodynamics, Quantum mechanics, Philosophy, Engineering, Linguistics, Mathematical analysis, MathematicsTop concepts (fields/topics) attached by OpenAlex
- Cited by
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18Total citation count in OpenAlex
- Citations by year (recent)
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2025: 2, 2023: 3, 2022: 5, 2021: 7, 2020: 1Per-year citation counts (last 5 years)
- References (count)
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92Number of works referenced by this work
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10Other works algorithmically related by OpenAlex
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