NAOC Open IR
Low-alpha metal-rich stars with sausage kinematics in the LAMOST survey: Are they from the Gaia-Sausage-Enceladus galaxy?
Zhao, Gang1,2; Chen, Yuqin1,2
2021-03-01
Source PublicationSCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
ISSN1674-7348
Volume64Issue:3Pages:13
AbstractWe search for metal-rich Sausage-kinematic (MRSK) stars with [Fe/H] > -0.8 and -100 < V- < 50 km/s in LAMOST DR5 in order to investigate the influence of the Gaia-Sausage-Enceladus (GSE) merger event on the Galactic disk. For the first time, we find a group of low- MRSK stars, and classify it as a metal-rich tail of the GSE galaxy based on the chemical and kinematical properties. This group has slightly larger R-apo, Z(max) and E-tot distributions than a previously-reported high-alpha group. Its low-alpha ratio does not allow for an origin resulting from the splash process of the GSE merger event, as is proposed to explain the high-alpha group. A hydrodynamical simulation by Amarante et al. provides a promising solution, in which the GSE galaxy is a clumpy Milky-Way analogue that develops a bimodal disk chemistry. This scenario explains the existence of MRSK stars with both high-alpha and low-alpha ratios found in this work. It is further supported by another new feature that a clump of MRSK stars is located at Z(max)=3-5 kpc, which corresponds to the widely adopted disk-halo transition at |Z| similar to 4 kpc. We suggest that a pile-up of MRSK stars at Z(max) contributes significantly to this disk-halo transition, an interesting imprint left by the GSE merger event. These results also provide an important implication on the connection between the GSE and the Virgo Radial Merger.
KeywordGalactic halo spiral arms and Galactic disk chemical composition and chemical evolution kinematics and dynamics rotation
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Oce of Science ; U.S. Department of Energy Oce of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; Carnegie Institution for Science ; Carnegie Institution for Science ; Chilean Participation Group ; Chilean Participation Group ; French Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Harvard-Smithsonian Center for Astrophysics ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Korean Participation Group ; Korean Participation Group ; Lawrence Berkeley National Laboratory ; Lawrence Berkeley National Laboratory ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University ; Yale University ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Oce of Science ; U.S. Department of Energy Oce of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; Carnegie Institution for Science ; Carnegie Institution for Science ; Chilean Participation Group ; Chilean Participation Group ; French Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Harvard-Smithsonian Center for Astrophysics ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Korean Participation Group ; Korean Participation Group ; Lawrence Berkeley National Laboratory ; Lawrence Berkeley National Laboratory ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University ; Yale University ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Oce of Science ; U.S. Department of Energy Oce of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; Carnegie Institution for Science ; Carnegie Institution for Science ; Chilean Participation Group ; Chilean Participation Group ; French Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Harvard-Smithsonian Center for Astrophysics ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Korean Participation Group ; Korean Participation Group ; Lawrence Berkeley National Laboratory ; Lawrence Berkeley National Laboratory ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University ; Yale University ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Oce of Science ; U.S. Department of Energy Oce of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; Carnegie Institution for Science ; Carnegie Institution for Science ; Chilean Participation Group ; Chilean Participation Group ; French Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Harvard-Smithsonian Center for Astrophysics ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Korean Participation Group ; Korean Participation Group ; Lawrence Berkeley National Laboratory ; Lawrence Berkeley National Laboratory ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University ; Yale University ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project
DOI10.1007/s11433-020-1645-5
Language英语
Funding ProjectNational Natural Science Foundation of China[11988101] ; National Natural Science Foundation of China[11625313] ; National Natural Science Foundation of China[11890694] ; National Key R&D Program of China[2019YFA0405502] ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; National Development and Reform Commission ; Chinese Academy of Sciences ; Alfred P. Sloan Foundation ; U.S. Department of Energy Oce of Science ; Center for High-Performance Computing at the University of Utah ; Carnegie Institution for Science ; Chilean Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Korean Participation Group ; Lawrence Berkeley National Laboratory ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University ; 2-m Chinese Space Survey Telescope project
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Oce of Science ; U.S. Department of Energy Oce of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; Carnegie Institution for Science ; Carnegie Institution for Science ; Chilean Participation Group ; Chilean Participation Group ; French Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Harvard-Smithsonian Center for Astrophysics ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Korean Participation Group ; Korean Participation Group ; Lawrence Berkeley National Laboratory ; Lawrence Berkeley National Laboratory ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University ; Yale University ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Oce of Science ; U.S. Department of Energy Oce of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; Carnegie Institution for Science ; Carnegie Institution for Science ; Chilean Participation Group ; Chilean Participation Group ; French Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Harvard-Smithsonian Center for Astrophysics ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Korean Participation Group ; Korean Participation Group ; Lawrence Berkeley National Laboratory ; Lawrence Berkeley National Laboratory ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University ; Yale University ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Oce of Science ; U.S. Department of Energy Oce of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; Carnegie Institution for Science ; Carnegie Institution for Science ; Chilean Participation Group ; Chilean Participation Group ; French Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Harvard-Smithsonian Center for Astrophysics ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Korean Participation Group ; Korean Participation Group ; Lawrence Berkeley National Laboratory ; Lawrence Berkeley National Laboratory ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University ; Yale University ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; National Key R&D Program of China ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; Guoshoujing Telescope (the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, LAMOST) ; National Development and Reform Commission ; National Development and Reform Commission ; Chinese Academy of Sciences ; Chinese Academy of Sciences ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Oce of Science ; U.S. Department of Energy Oce of Science ; Center for High-Performance Computing at the University of Utah ; Center for High-Performance Computing at the University of Utah ; Carnegie Institution for Science ; Carnegie Institution for Science ; Chilean Participation Group ; Chilean Participation Group ; French Participation Group ; French Participation Group ; Harvard-Smithsonian Center for Astrophysics ; Harvard-Smithsonian Center for Astrophysics ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo ; Korean Participation Group ; Korean Participation Group ; Lawrence Berkeley National Laboratory ; Lawrence Berkeley National Laboratory ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; Max-PlanckInstitut fur Extraterrestrische Physik (MPE) ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; New Mexico State University, New York University, University of Notre Dame, Observatario Nacional/MCTI ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Shanghai Astronomical Observatory, United Kingdom Participation Group ; Yale University ; Yale University ; 2-m Chinese Space Survey Telescope project ; 2-m Chinese Space Survey Telescope project
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000616492700001
PublisherSCIENCE PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/79277
Collection中国科学院国家天文台
Corresponding AuthorZhao, Gang
Affiliation1.Chinese Acad Sci, CAS Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 101408, Peoples R China
Recommended Citation
GB/T 7714
Zhao, Gang,Chen, Yuqin. Low-alpha metal-rich stars with sausage kinematics in the LAMOST survey: Are they from the Gaia-Sausage-Enceladus galaxy?[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2021,64(3):13.
APA Zhao, Gang,&Chen, Yuqin.(2021).Low-alpha metal-rich stars with sausage kinematics in the LAMOST survey: Are they from the Gaia-Sausage-Enceladus galaxy?.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,64(3),13.
MLA Zhao, Gang,et al."Low-alpha metal-rich stars with sausage kinematics in the LAMOST survey: Are they from the Gaia-Sausage-Enceladus galaxy?".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 64.3(2021):13.
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