Cited by 174Stellar, planetary, and galactic studiesGalaxies: Formation, Evolution, PhenomenaAstrophysics and Star Formation Studies

Where does the disk stop and the halo begin? Kinematics in a rotation field

Morrison, Heather L., Flynn, Chris, Freeman, K. C.·1990·The Astronomical Journal

Abstract

A sample of G and K giants, approximately 4 kpc away from the sun, covering the abundance range from disk to halo in a field chosen to measure rotational kinematics, is discussed. To study the disk to halo transition, the sample has been enlarged with similar samples of stars in the solar neighborhood to include almost 200 giants and the concept of 'thick disk' has been introduced. For selected giants, abundances, distances, and reddenings are derived, and velocity dispersion is estimated. From the data presented, it is concluded that the disk and halo abundance distributions overlap and that their kinematics are discontinuous. The kinematics of the metal-weak red giants, with abundances extended as low as Fe/H = -1.6, is compared with the kinematics of the halo objects, and the data are interpreted with respect to the thick disk, the halo kinematics, and the theories of galaxy formation.

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Crossref · 10.1086/115587

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  • The thick disk has a significant metal-weak tail, often referred to as the metal-weak thick disk.

    “It also has a very significant tail, which is often referred to as the metalweak thick disk (Norris et al. 1985, Morrison et al. 1990, Morrison 1993, Beers et al. 2002).”

    From Streams, Substructures, and the Early History of the Milky Way (2020) · cites this paper as Morrison et al. 1990

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Authors
Morrison, H. L., Flynn, C., & Freeman, K. C.
Affiliations
Mount Stromlo Observatory (AU)
Venue
The Astronomical Journal
Published
1990-10
Volume
100
Pages
1191
ISSN
0004-6256 (ISSN-L)
OpenAlex
W2031130383
Cited by
174
References
0
Citations by year
2025: 3 · 2024: 6 · 2023: 2 · 2022: 6 · 2021: 7 · 2020: 10 · 2019: 9 · 2018: 6 · 2017: 4 · 2016: 3 · 2015: 2 · 2014: 7 · 2013: 3 · 2012: 2
FWCI
11.09
Type
journal article
Language
en
Open access
closed
Locations
The Astronomical Journal (publishedVersion)
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 › Astrophysics and Star Formation Studies
Keywords
thick disk, rotational kinematics, velocity dispersion, chemical abundances, halo kinematics, galaxy formation

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