Cited by 90Stellar, planetary, and galactic studiesGalaxies: Formation, Evolution, PhenomenaAstrophysical Phenomena and Observations

Disassembling the Galaxy with angle-action coordinates

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McMillan, Paul J., Binney, James J.·2008·Monthly Notices of the Royal Astronomical Society

Abstract

Angle-action coordinates are used to study the relic of an N-body simulation of a self-gravitating satellite galaxy that was released on a short-period orbit within the disc of the Galaxy. Satellite stars that lie within 1.5 kpc of the Sun are confined to a grid of patches in action space. As the relic phase mixes for longer, the patches become smaller and more numerous. These patches can be seen even when the angle-action coordinates of an erroneous Galactic potential are used, but using the wrong potential displaces them. Diagnostic quantities constructed from the angle coordinates both allow the true potential to be identified, and the relic to be dated. Hence, when the full phase space coordinates of large numbers of solar-neighbourhood stars are known, it should be possible to identify members of particular relics from the distribution of stars in an approximate action space. This would then open up the possibility of determining the time since the relic was disrupted and gaining better knowledge of the Galactic potential. The availability of angle-action coordinates for arbitrary potentials is the key to these developments. The paper includes a brief introduction to the torus technique used to generate them.

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Crossref · 10.1111/j.1365-2966.2008.13767.x

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  • Individual streams or portions of streams are particularly apparent in frequency space because each stream has its own characteristic frequency defining its phase along the orbit.

    “Individual streams or portions of streams are particularly apparent in frequency space, as can be seen in Figure 4a.This is because the individual streams each have their own characteristic frequency (which defines their phase along the orbit; see McMillan & Binney 2008, Gómez & Helmi 2010).”

    From Streams, Substructures, and the Early History of the Milky Way (2020) · cites this paper as McMillan & Binney 2008

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Research works printed but not linked: 4

  1. Binney J., Tremaine S., 2008, Galactic dynamics. Princeton, NJ, Princeton University Press
  2. -, 2002, Journal of Computational Physics, 179, 27
  3. Press W. H., Flannery B. P., Teukolsky S. A., 1986, Numerical recipes. The art of scientific computing. Cambridge: University Press
  4. Steinmetz M., Zwitter T., Siebert A., Watson F. G., Freeman K. C., Munari U., Campbell R., Williams M., Seabroke G. M., Wyse R. F. G., Parker Q. A., Bienaym´ e O., Roeser S., Gibson B. K., Gilmore G., Grebel E. K., Helmi A., Navarro J. F., Burton D., Cass C. J. P., Dawe J. A., Fiegert K., Hartley M., Russell K. S., Saunders W., Enke H., Bailin J., Binney J., Bland-Hawthorn J., Boeche C., Dehnen W., Eisenstein D. J., Evans N. W., Fiorucci M., Fulbright J. P., Gerhard O., Jauregi U., Kelz A., Mijovi´ c L., Minchev I., Parmentier G., Pe˜ narrubia J., Quillen A. C., Read M. A., Ruchti G., Scholz R.-D., Siviero A., Smith M. C., Sordo R., Veltz L., Vidrih S., von Berlepsch R., Boyle B. J., Schilbach E., 2006, AJ, 132, 1645

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Authors
McMillan, P. J., & Binney, J. J.
Affiliations
University of Oxford (GB)
Corresponding author
McMillan, Paul J.
Venue
Monthly Notices of the Royal Astronomical Society
Published
2008-10-11
Volume
390
Issue
1
Pages
429-437
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
OpenAlex
W2038211724
Cited by
90
References
30
Citations by year
2026: 1 · 2025: 4 · 2024: 2 · 2023: 4 · 2022: 6 · 2021: 5 · 2020: 4 · 2019: 8 · 2018: 2 · 2017: 4 · 2016: 6 · 2015: 10 · 2014: 4 · 2013: 10 · 2012: 4
FWCI
3.11
Type
journal article
Language
en
Open access
Locations
  • Monthly Notices of the Royal Astronomical Society (publishedVersion)
  • arXiv (Cornell University) (acceptedVersion)
  • Lund University Publications (Lund University) (submittedVersion)
  • arXiv (Cornell University) (cc-by)
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
action space, Galactic potential, phase space, N-body simulations, short-period orbits, solar neighbourhood stars, stellar kinematics, Galactic disc

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