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Co-formation of the thin and thick discs revealed by APOGEE-DR16 and Gaia-DR2
Silva, Leandro Beraldo E.1; Debattista, Victor P.1; Nidever, David2,3; Amarante, Joao A. S.4,5; Garver, Bethany2
2021-03-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume502Issue:1Pages:260-272
AbstractSince thin disc stars are younger than thick disc stars on average, the thin disc is predicted by some models to start forming after the thick disc had formed, around 10 Gyr ago. Accordingly, no significant old thin disc population should exist. Using 6D coordinates from Gaia-DR2 and age estimates from Sanders & Das, we select similar to 24 000 old stars (tau > 10 Gyr, with uncertainties less than or similar to 15 per cent) within 2 kpc from the Sun (full sample). A cross-match with APOGEE-DR16 (similar to 1000 stars) reveals comparable fractions of old chemically defined thin/thick disc stars. We show that the full sample pericentre radius (r(per)) distribution has three peaks, one associated with the stellar halo and the other two having contributions from the thin/thick discs. Using a high-resolution N-body + SPH simulation, we demonstrate that one peak, at r(per) approximate to 7.1 kpc, is produced by stars from both discs that were born in the inner Galaxy and migrated to the Solar Neighbourhood. In the Solar Neighbourhood, similar to 1/2 (similar to 1/3) of the old thin (thick) disc stars are classified as migrators. Our results suggest that thin/thick discs are affected differently by radial migration inasmuch as they have different eccentricity distributions, regardless of vertical scale heights. We interpret the existence of a significant old thin disc population as evidence for an early co-formation of thin/thick discs, arguing that clump instabilities in the early disc offer a compelling explanation for the observed trends.
KeywordGalaxy: abundances Galaxy: disc Galaxy: evolution Galaxy: formation Galaxy: structure
Funding OrganizationSTFC ; STFC ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; The World Academy of Sciences ; The World Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant ; STFC ; STFC ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; The World Academy of Sciences ; The World Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant ; STFC ; STFC ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; The World Academy of Sciences ; The World Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant ; STFC ; STFC ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; The World Academy of Sciences ; The World Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant
DOI10.1093/mnras/staa3966
WOS KeywordMILKY-WAY ; CHEMICAL EVOLUTION ; STELLAR HALO ; DATA RELEASE ; STARS ; SIMULATIONS ; MIGRATION ; PROFILE ; DISKS ; I.
Language英语
Funding ProjectSTFC[ST/R000786/1] ; STFC[ST/H008586/1] ; BIS National E-infrastructure capital grant[ST/J005673/1] ; The World Academy of Sciences ; Chinese Academy of Sciences ; STFC DiRAC Operations grant[ST/K00333X/1]
Funding OrganizationSTFC ; STFC ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; The World Academy of Sciences ; The World Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant ; STFC ; STFC ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; The World Academy of Sciences ; The World Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant ; STFC ; STFC ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; The World Academy of Sciences ; The World Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant ; STFC ; STFC ; BIS National E-infrastructure capital grant ; BIS National E-infrastructure capital grant ; The World Academy of Sciences ; The World Academy of Sciences ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; STFC DiRAC Operations grant ; STFC DiRAC Operations grant
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000649423200017
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/77060
Collection中国科学院国家天文台
Corresponding AuthorSilva, Leandro Beraldo E.
Affiliation1.Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, Lancs, England
2.Montana State Univ, Dept Phys, POB 173840, Bozeman, MT 59717 USA
3.NSFs Natl Opt Infrared Astron Res Lab, 950 North Cherry Ave, Tucson, AZ 85719 USA
4.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, 80 Nandan Rd, Shanghai 200030, Peoples R China
5.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Silva, Leandro Beraldo E.,Debattista, Victor P.,Nidever, David,et al. Co-formation of the thin and thick discs revealed by APOGEE-DR16 and Gaia-DR2[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2021,502(1):260-272.
APA Silva, Leandro Beraldo E.,Debattista, Victor P.,Nidever, David,Amarante, Joao A. S.,&Garver, Bethany.(2021).Co-formation of the thin and thick discs revealed by APOGEE-DR16 and Gaia-DR2.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,502(1),260-272.
MLA Silva, Leandro Beraldo E.,et al."Co-formation of the thin and thick discs revealed by APOGEE-DR16 and Gaia-DR2".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 502.1(2021):260-272.
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