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Fundamental relatio...
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Sharma, SanjibCenter of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of Sydney
(author)
Fundamental relations for the velocity dispersion of stars in the Milky Way
- Article/chapterEnglish2021
Publisher, publication year, extent ...
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2021-06-21
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Oxford University Press (OUP),2021
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printrdacarrier
Numbers
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LIBRIS-ID:oai:DiVA.org:su-199128
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-199128URI
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https://doi.org/10.1093/mnras/stab1086DOI
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https://lup.lub.lu.se/record/0fade640-e958-49c7-8686-f8485c6970a5URI
Supplementary language notes
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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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.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Hayden, Michael R.Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of Sydney
(author)
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Bland-Hawthorn, JossUniversity of Sydney,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
(author)
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Stello, DennisAarhus University,University of New South Wales,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
(author)
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Buder, SvenCenter of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),Max Planck Institute for Astronomy,Australian National University
(author)
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Zinn, Joel C.University of New South Wales
(author)
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Kallinger, ThomasUniversity of Vienna
(author)
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Asplund, MartinMax Planck Institute for Astrophysic
(author)
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De Silva, Gayandhi M.Macquarie University, Sydney
(author)
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D'Orazi, ValentinaINAF - Osservatorio Astronomico di Padova
(author)
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Freeman, KenAustralian National University
(author)
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Kos, JanezUniversity of Ljubljana
(author)
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Lewis, Geraint F.University of Sydney
(author)
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Lin, JaneAustralian National University
(author)
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Lind, KarinStockholm University,Stockholms universitet,Institutionen för astronomi(Swepub:su)kali3212
(author)
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Martell, SarahCenter of Excellence for Astrophysics in Three Dimensions (ASTRO-3D),University of New South Wales
(author)
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Simpson, Jeffrey D.University of New South Wales
(author)
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Wittenmyer, Rob A.University of Southern Queensland
(author)
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Zucker, Daniel B.Macquarie University, Sydney
(author)
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Zwitter, TomazUniversity of Ljubljana
(author)
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Chen, BoquanUniversity of Sydney
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Cotar, KlemenUniversity of Ljubljana
(author)
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Esdaile, JamesUniversity of New South Wales
(author)
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Hon, MarcUniversity of New South Wales
(author)
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Horner, JonathanUniversity of Southern Queensland
(author)
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Huber, DanielUniversity of Hawai'i at Hilo
(author)
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Kafle, Prajwal R.University of Western Australia, Crawley
(author)
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Khanna, ShouryaUniversity of Sydney
(author)
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Ting, Yuan-SenPrinceton University,Institute for Advanced Study, Princeton,Carnegie Observatories,Australian National University
(author)
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Nataf, David M.Johns Hopkins University
(author)
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Nordlander, ThomasAustralian National University,Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)
(author)
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Saadon, Mohd Hafiz MohdUniversity of New South Wales,University of Malaya
(author)
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Tepper-Garcia, ThorUniversity of Sydney
(author)
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Tinney, C. G.University of New South Wales
(author)
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Traven, GregorLund 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(Swepub:lu)gr0220tr
(author)
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Watson, FredAustralian Government: Department of Industry, Innovation and Science
(author)
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Wright, DuncanUniversity of Southern Queensland
(author)
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Wyse, Rosemary F. G.Johns Hopkins University
(author)
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Center of Excellence for Astrophysics in Three Dimensions (ASTRO-3D)University of Sydney
(creator_code:org_t)
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In:Monthly notices of the Royal Astronomical Society: Oxford University Press (OUP)506:2, s. 1761-17760035-87111365-2966
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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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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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