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Fundamental relatio...
Fundamental relations for the velocity dispersion of stars in the Milky Way
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- Sharma, Sanjib (författare)
- Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of Sydney
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- Hayden, Michael R. (författare)
- Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of Sydney
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- Bland-Hawthorn, Joss (författare)
- University of Sydney,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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visa fler...
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- Stello, Dennis (författare)
- Aarhus University,University of New South Wales,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Buder, Sven (författare)
- Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),Max Planck Institute for Astronomy,Australian National University
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- Zinn, Joel C. (författare)
- University of New South Wales
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- Kallinger, Thomas (författare)
- University of Vienna
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- Asplund, Martin (författare)
- Max Planck Institute for Astrophysic
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- De Silva, Gayandhi M. (författare)
- Macquarie University, Sydney
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- D'Orazi, Valentina (författare)
- INAF - Osservatorio Astronomico di Padova
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- Freeman, Ken (författare)
- Australian National University
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- Kos, Janez (författare)
- University of Ljubljana
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- Lewis, Geraint F. (författare)
- University of Sydney
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- Lin, Jane (författare)
- Australian National University
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- Lind, Karin (författare)
- Stockholm University,Stockholms universitet,Institutionen för astronomi
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- Martell, Sarah (författare)
- Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of New South Wales
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- Simpson, Jeffrey D. (författare)
- University of New South Wales
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- Wittenmyer, Rob A. (författare)
- University of Southern Queensland
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- Zucker, Daniel B. (författare)
- Macquarie University, Sydney
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- Zwitter, Tomaz (författare)
- University of Ljubljana
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- Chen, Boquan (författare)
- University of Sydney
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- Cotar, Klemen (författare)
- University of Ljubljana
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- Esdaile, James (författare)
- University of New South Wales
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- Hon, Marc (författare)
- University of New South Wales
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- Horner, Jonathan (författare)
- University of Southern Queensland
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- Huber, Daniel (författare)
- University of Hawai'i at Hilo
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- Kafle, Prajwal R. (författare)
- University of Western Australia, Crawley
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- Khanna, Shourya (författare)
- University of Sydney
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- Ting, Yuan-Sen (författare)
- Princeton University,Institute for Advanced Study, Princeton,Carnegie Observatories,Australian National University
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- Nataf, David M. (författare)
- Johns Hopkins University
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- Nordlander, Thomas (författare)
- Australian National University,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
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- Saadon, Mohd Hafiz Mohd (författare)
- University of New South Wales,University of Malaya
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- Tepper-Garcia, Thor (författare)
- University of Sydney
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- Tinney, C. G. (författare)
- University of New South Wales
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- Traven, Gregor (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Watson, Fred (författare)
- Australian Government: Department of Industry, Innovation and Science
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- Wright, Duncan (författare)
- University of Southern Queensland
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- Wyse, Rosemary F. G. (författare)
- Johns Hopkins University
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(creator_code:org_t)
- 2021-06-21
- 2021
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 506:2, s. 1761-1776
- Relaterad länk:
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http://eprints.usq.e...
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http://dx.doi.org/10...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://lup.lub.lu.s...
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Abstract
Ämnesord
Stäng
- We explore the fundamental relations governing the radial and vertical velocity dispersions of stars in the Milky Way, from combined studies of complementary surveys including GALAH, LAMOST, APOGEE, the NASA Kepler and K2 missions, and Gaia DR2. We find that different stellar samples, even though they target different tracer populations and employ a variety of age estimation techniques, follow the same set of fundamental relations. We provide the clearest evidence to date that, in addition to the well-known dependence on stellar age, the velocity dispersions of stars depend on orbital angular momentum Lz, metallicity, and height above the plane |z|, and are well described by a multiplicatively separable functional form. The dispersions have a power-law dependence on age with exponents of 0.441 ± 0.007 and 0.251 ± 0.006 for σz and σR, respectively, and the power law is valid even for the oldest stars. For the solar neighbourhood stars, the apparent break in the power law for older stars, as seen in previous studies, is due to the anticorrelation of Lz with age. The dispersions decrease with increasing Lz until we reach the Sun’s orbital angular momentum, after which σz increases (implying flaring in the outer disc) while σR flattens. For a given age, the dispersions increase with decreasing metallicity, suggesting that the dispersions increase with birth radius. The dispersions also increase linearly with |z|. The same set of relations that work in the solar neighbourhood also work for stars between 3 < R/kpc < 20. Finally, the high-[α/Fe] stars follow the same relations as the low-[α/Fe] stars.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Galaxy: disc
- Galaxy: evolution
- Galaxy: formation
- Galaxy: kinematics and dynamics
- Galaxy: disc
- Galaxy: evolution
- Galaxy: formation
- Galaxy: kinematics and dynamics
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- ref (ämneskategori)
- art (ämneskategori)
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Sharma, Sanjib
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Hayden, Michael ...
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Bland-Hawthorn, ...
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Stello, Dennis
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Buder, Sven
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Zinn, Joel C.
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visa fler...
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Kallinger, Thoma ...
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Asplund, Martin
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De Silva, Gayand ...
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D'Orazi, Valenti ...
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Freeman, Ken
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Kos, Janez
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Lewis, Geraint F ...
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Lin, Jane
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Lind, Karin
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Martell, Sarah
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Simpson, Jeffrey ...
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Wittenmyer, Rob ...
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Zucker, Daniel B ...
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Zwitter, Tomaz
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Chen, Boquan
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Cotar, Klemen
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Esdaile, James
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Hon, Marc
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Horner, Jonathan
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Huber, Daniel
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Kafle, Prajwal R ...
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Khanna, Shourya
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Ting, Yuan-Sen
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Nataf, David M.
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Nordlander, Thom ...
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Saadon, Mohd Haf ...
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Tepper-Garcia, T ...
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Tinney, C. G.
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Traven, Gregor
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Watson, Fred
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Wright, Duncan
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Wyse, Rosemary F ...
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