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Two Substructures in the nearby Stellar Halo Found in Gaia and RAVE

文献类型：期刊论文

作者Li, Hefan3; Du, Cuihua4; Yang, Yanbin1; Newberg, Heidi Jo5; Ma, Jun2,4; Shi, Jianrong2,4; Piao, Yunsong3
刊名ASTROPHYSICAL JOURNAL
出版日期2020-05-01
卷号895期号:1页码:10
ISSN号0004-637X
关键词Galaxy kinematics Galaxy stellar halos Galaxy formation Galaxy abundances Galaxy dynamics Solar neighborhood
DOI10.3847/1538-4357/ab8733
英文摘要We use the second Gaia data release (Gaia DR2), combined with Radial Velocity Experiment spectroscopic surveys, to identify the substructures in the nearby stellar halo. We select 3845 halo stars kinematically and chemically and determine their density distribution in energy and angular momentum space. To select the substructures from overdensities, we reshuffle the velocities and estimate their significance. Two statistically significant substructures, GR-1 and GR-2, are identified. GR-1 has a high binding energy and small z-angular momentum. GR-2 is metal-rich but retrograde. They are both new substructures, and may be accretion debris of dwarf galaxies.
WOS关键词DIGITAL SKY SURVEY ; MILKY-WAY TOMOGRAPHY ; GALAXY FORMATION ; THICK DISKS ; SAGITTARIUS ; STREAMS ; STARS ; DWARF ; CALIBRATION ; ORPHAN
资助项目National Natural Foundation of China (NSFC)[11973042] ; National Natural Foundation of China (NSFC)[11973052] ; NSF[AST 16-15688] ; Alfred P. Sloan Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; Australian Astronomical Observatory ; Leibniz-Institut fuer Astrophysik Potsdam (AIP) ; Australian National University ; Australian Research Council ; French National Research Agency ; German Research Foundation[SPP 1177] ; German Research Foundation[SFB 881] ; European Research Council[ERC-StG 240271 Galactica] ; Istituto Nazionale di Astrofisica at Padova ; Johns Hopkins University ; National Science Foundation of the USA[AST-0908326] ; W. M. Keck foundation ; Macquarie University ; Netherlands Research School for Astronomy ; Natural Sciences and Engineering Research Council of Canada ; Slovenian Research Agency ; Swiss National Science Foundation ; Science & Technology Facilities Council of the UK ; Opticon ; Strasbourg Observatory ; University of Groningen ; University of Heidelberg ; University of Sydney
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000536891300001
资助机构National Natural Foundation of China (NSFC) ; National Natural Foundation of China (NSFC) ; NSF ; NSF ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; National Science Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Australian Astronomical Observatory ; Australian Astronomical Observatory ; Leibniz-Institut fuer Astrophysik Potsdam (AIP) ; Leibniz-Institut fuer Astrophysik Potsdam (AIP) ; Australian National University ; Australian National University ; Australian Research Council ; Australian Research Council ; French National Research Agency ; French National Research Agency ; German Research Foundation ; German Research Foundation ; European Research Council ; European Research Council ; Istituto Nazionale di Astrofisica at Padova ; Istituto Nazionale di Astrofisica at Padova ; Johns Hopkins University ; Johns Hopkins University ; National Science Foundation of the USA ; National Science Foundation of the USA ; W. M. Keck foundation ; W. M. Keck foundation ; Macquarie University ; Macquarie University ; Netherlands Research School for Astronomy ; Netherlands Research School for Astronomy ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; Slovenian Research Agency ; Slovenian Research Agency ; Swiss National Science Foundation ; Swiss National Science Foundation ; Science & Technology Facilities Council of the UK ; Science & Technology Facilities Council of the UK ; Opticon ; Opticon ; Strasbourg Observatory ; Strasbourg Observatory ; University of Groningen ; University of Groningen ; University of Heidelberg ; University of Heidelberg ; University of Sydney ; University of Sydney ; National Natural Foundation of China (NSFC) ; National Natural Foundation of China (NSFC) ; NSF ; NSF ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; National Science Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Australian Astronomical Observatory ; Australian Astronomical Observatory ; Leibniz-Institut fuer Astrophysik Potsdam (AIP) ; Leibniz-Institut fuer Astrophysik Potsdam (AIP) ; Australian National University ; Australian National University ; Australian Research Council ; Australian Research Council ; French National Research Agency ; French National Research Agency ; German Research Foundation ; German Research Foundation ; European Research Council ; European Research Council ; Istituto Nazionale di Astrofisica at Padova ; Istituto Nazionale di Astrofisica at Padova ; Johns Hopkins University ; Johns Hopkins University ; National Science Foundation of the USA ; National Science Foundation of the USA ; W. M. Keck foundation ; W. M. Keck foundation ; Macquarie University ; Macquarie University ; Netherlands Research School for Astronomy ; Netherlands Research School for Astronomy ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; Slovenian Research Agency ; Slovenian Research Agency ; Swiss National Science Foundation ; Swiss National Science Foundation ; Science & Technology Facilities Council of the UK ; Science & Technology Facilities Council of the UK ; Opticon ; Opticon ; Strasbourg Observatory ; Strasbourg Observatory ; University of Groningen ; University of Groningen ; University of Heidelberg ; University of Heidelberg ; University of Sydney ; University of Sydney ; National Natural Foundation of China (NSFC) ; National Natural Foundation of China (NSFC) ; NSF ; NSF ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; National Science Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Australian Astronomical Observatory ; Australian Astronomical Observatory ; Leibniz-Institut fuer Astrophysik Potsdam (AIP) ; Leibniz-Institut fuer Astrophysik Potsdam (AIP) ; Australian National University ; Australian National University ; Australian Research Council ; Australian Research Council ; French National Research Agency ; French National Research Agency ; German Research Foundation ; German Research Foundation ; European Research Council ; European Research Council ; Istituto Nazionale di Astrofisica at Padova ; Istituto Nazionale di Astrofisica at Padova ; Johns Hopkins University ; Johns Hopkins University ; National Science Foundation of the USA ; National Science Foundation of the USA ; W. M. Keck foundation ; W. M. Keck foundation ; Macquarie University ; Macquarie University ; Netherlands Research School for Astronomy ; Netherlands Research School for Astronomy ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; Slovenian Research Agency ; Slovenian Research Agency ; Swiss National Science Foundation ; Swiss National Science Foundation ; Science & Technology Facilities Council of the UK ; Science & Technology Facilities Council of the UK ; Opticon ; Opticon ; Strasbourg Observatory ; Strasbourg Observatory ; University of Groningen ; University of Groningen ; University of Heidelberg ; University of Heidelberg ; University of Sydney ; University of Sydney ; National Natural Foundation of China (NSFC) ; National Natural Foundation of China (NSFC) ; NSF ; NSF ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; National Science Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; Australian Astronomical Observatory ; Australian Astronomical Observatory ; Leibniz-Institut fuer Astrophysik Potsdam (AIP) ; Leibniz-Institut fuer Astrophysik Potsdam (AIP) ; Australian National University ; Australian National University ; Australian Research Council ; Australian Research Council ; French National Research Agency ; French National Research Agency ; German Research Foundation ; German Research Foundation ; European Research Council ; European Research Council ; Istituto Nazionale di Astrofisica at Padova ; Istituto Nazionale di Astrofisica at Padova ; Johns Hopkins University ; Johns Hopkins University ; National Science Foundation of the USA ; National Science Foundation of the USA ; W. M. Keck foundation ; W. M. Keck foundation ; Macquarie University ; Macquarie University ; Netherlands Research School for Astronomy ; Netherlands Research School for Astronomy ; Natural Sciences and Engineering Research Council of Canada ; Natural Sciences and Engineering Research Council of Canada ; Slovenian Research Agency ; Slovenian Research Agency ; Swiss National Science Foundation ; Swiss National Science Foundation ; Science & Technology Facilities Council of the UK ; Science & Technology Facilities Council of the UK ; Opticon ; Opticon ; Strasbourg Observatory ; Strasbourg Observatory ; University of Groningen ; University of Groningen ; University of Heidelberg ; University of Heidelberg ; University of Sydney ; University of Sydney
源URL[http://ir.bao.ac.cn/handle/114a11/54770]  
专题中国科学院国家天文台
通讯作者Du, Cuihua
作者单位1.PSL Res Univ, Observ Paris, CNRS, GEPI, Pl Jules Janssen, F-92190 Meudon, France
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
3.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
4.Univ Chinese Acad Sci, Coll Astron & Space Sci, Beijing 100049, Peoples R China
5.Rensselaer Polytech Inst, Dept Phys Appl Phys & Astron, Troy, NY 12180 USA
推荐引用方式
GB/T 7714		 Li, Hefan,Du, Cuihua,Yang, Yanbin,et al. Two Substructures in the nearby Stellar Halo Found in Gaia and RAVE[J]. ASTROPHYSICAL JOURNAL,2020,895(1):10.
APA Li, Hefan.,Du, Cuihua.,Yang, Yanbin.,Newberg, Heidi Jo.,Ma, Jun.,...&Piao, Yunsong.(2020).Two Substructures in the nearby Stellar Halo Found in Gaia and RAVE.ASTROPHYSICAL JOURNAL,895(1),10.
MLA Li, Hefan,et al."Two Substructures in the nearby Stellar Halo Found in Gaia and RAVE".ASTROPHYSICAL JOURNAL 895.1(2020):10.

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