The GALAH Survey: chemical tagging and chrono-chemodynamics of accreted halo stars with GALAH+DR3 and Gaia eDR3

↓ Direkt till sidans innehåll
↓ Direkt till sidans sekundära innehåll (sidomenyn)

Search: onr:"swepub:oai:DiVA.org:su-202428" > The GALAH Survey :

1 of 1
Previous record
Next record
To hitlist

The GALAH Survey : chemical tagging and chrono-chemodynamics of accreted halo stars with GALAH+DR3 and Gaia eDR3

Buder, Sven (author)

Lind, Karin (author): Uppsala University,Stockholm University,Stockholms universitet,Institutionen för astronomi,INAF - Osservatorio Astrofisico di Arcetri,Max Planck Institute for Astronomy

Ness, Melissa K. (author): Flatiron Institute,Max Planck Institute for Astronomy,Columbia University

Feuillet, Diane (author): 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

Horta, Danny (author)

Monty, Stephanie (author)

Buck, Tobias (author)

Nordlander, Thomas (author)

Bland-Hawthorn, Joss (author)

Casey, Andrew R. (author)

De Silva, Gayandhi M. (author)

D'Orazi, Valentina (author)

Freeman, Ken C. (author)

Hayden, Michael R. (author)

Kos, Janez (author)

Martell, Sarah L. (author)

Lewis, Geraint F. (author)

Lin, Jane (author)

Schlesinger, Katharine J. (author)

Sharma, Sanjib (author)

Simpson, Jeffrey D. (author)

Stello, Dennis (author)

Zucker, Daniel B. (author)

Zwitter, Tomaž (author)

Ciucă, Ioana (author)

Horner, Jonathan (author)

Kobayashi, Chiaki (author)

Ting (丁源森), Yuan-Sen (author)

Wyse, Rosemary F. G. (author)

show less...

(creator_code:org_t)

2021-12-03
2022
English.
In: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 510:2, s. 2407-2436

Related links:: http://eprints.usq.e...; show more...; http://dx.doi.org/10...; https://urn.kb.se/re...; https://doi.org/10.1...; https://lup.lub.lu.s...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

Since the advent of Gaia astrometry, it is possible to identify massive accreted systems within the Galaxy through their unique dynamical signatures. One such system, Gaia-Sausage-Enceladus (GSE), appears to be an early ‘building block’ given its virial mass >1010M⊙ at infall (z ∼ 1−3). In order to separate the progenitor population from the background stars, we investigate its chemical properties with up to 30 element abundances from the GALAH+ Survey Data Release 3 (DR3). To inform our choice of elements for purely chemically selecting accreted stars, we analyse 4164 stars with low-α abundances and halo kinematics. These are most different to the Milky Way stars for abundances of Mg, Si, Na, Al, Mn, Fe, Ni, and Cu. Based on the significance of abundance differences and detection rates, we apply Gaussian mixture models to various element abundance combinations. We find the most populated and least contaminated component, which we confirm to represent GSE, contains 1049 stars selected via [Na/Fe] versus [Mg/Mn] in GALAH+ DR3. We provide tables of our selections and report the chrono-chemodynamical properties (age, chemistry, and dynamics). Through a previously reported clean dynamical selection of GSE stars, including 30<√JR/kpckms−1<55⁠, we can characterize an unprecedented 24 abundances of this structure with GALAH+ DR3. With our chemical selection we characterize the dynamical properties of the GSE, for example mean √JR/kpckms−1=26+9−14⁠. We find only (29±1) per cent of the GSE stars within the clean dynamical selection region. Our methodology will improve future studies of accreted structures and their importance for the formation of the Milky Way.

Find in a library

Monthly notices of the Royal Astronomical Society (Search for host publication in LIBRIS)

To the university's database

1 of 1
Previous record
Next record
To hitlist

Find more in SwePub

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

Articles in the publication: Monthly notices ...

By the university: Stockholm University; Lund University

Search outside SwePub

Extend your search to:: Google; Google Book Search; Google Scholar

Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.

LIBRIS.kb.se

The GALAH Survey : chemical tagging and chrono-chemodynamics of accreted halo stars with GALAH+DR3 and Gaia eDR3

Subject headings

Keyword

Publication and Content Type

Find in a library

To the university's database

Find more in SwePub

Search outside SwePub