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Chemical Abundances and Ages of the Bulge Stars in APOGEE High-velocity Peaks
Zhou, Yingying1,2; Shen, Juntai1,2; Liu, Chao3; Li, Zhao-Yu1,2; Mao, Shude3,4,5; Kunder, Andrea6; Rich, R. Michael7; Zasowski, G.8,9; Fernandez-Trincado, J. G.10; Majewski, Steven R.11; Lin, Chien-Cheng1,19; Geisler, Doug10; Tang, Baitian10; Villanova, S.10; Roman-Lopes, A.12; Schultheis, M.13; Nidever, David L.14; Meza, Andres15; Pan, Kaike16,17; Bizyaev, D. V.16,17,18
2017-09-20
发表期刊ASTROPHYSICAL JOURNAL
卷号847期号:1
摘要A cold, high-velocity (HV, similar to 200 km s(-1)) peak was first reported in several Galactic bulge fields based on the Apache Point Observatory Galaxy Evolution Experiment (APOGEE) commissioning observations. Both the existence and the nature of the HV peak are still under debate. Here we revisit this feature with the latest APOGEE DR13 data. We find that most of the low-latitude bulge fields display a skewed Gaussian distribution with an HV shoulder. However, only 3 out of 53 fields show distinct HV peaks around 200 km s(-1). The velocity distribution can be well described by Gauss-Hermite polynomials, except for the three fields showing clear HV peaks. We find that the correlation between the skewness parameter (h(3)) and the mean velocity ((nu) over bar), instead of a distinctive HV peak, is a strong indicator of the bar. It was recently suggested that the HV peak is composed of preferentially young stars. We choose three fields showing clear HV peaks to test this hypothesis using the metallicity, [alpha/M], and [C/N] as age proxies. We find that both young and old stars show HV features. The similarity between the chemical abundances of stars in the HV peaks and the main component indicates that they are not systematically different in terms of chemical abundance or age. In contrast, there are clear differences in chemical space between stars in the Sagittarius dwarf and the bulge stars. The strong HV peaks off-plane are still to be explained properly and could be different in nature.
文章类型Article
关键词Galaxy: Abundances Galaxy: Bulge Galaxy: Kinematics And Dynamics Galaxy: Structure
WOS标题词Science & Technology ; Physical Sciences
资助者973 Program of China(2014CB845700) ; 973 Program of China(2014CB845700) ; National Natural Science Foundation of China(11333003 ; National Natural Science Foundation of China(11333003 ; CASSACA ; CASSACA ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; CAS/SAFEA ; CAS/SAFEA ; Shanghai Yangfan Research Grant(14YF1407700) ; Shanghai Yangfan Research Grant(14YF1407700) ; LAMOST ; LAMOST ; NSF(AST-1109718 ; NSF(AST-1109718 ; Chilean BASAL Centro de Excelencia en Astrofisica y Tecnologias Afines (CATA)(PFB-06/2007) ; Chilean BASAL Centro de Excelencia en Astrofisica y Tecnologias Afines (CATA)(PFB-06/2007) ; Fondecyt(1170518) ; Fondecyt(1170518) ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; University of Utah ; University of Utah ; 11390372 ; 11390372 ; AST-1312863 ; AST-1312863 ; 11322326 ; 11322326 ; AST-1616436) ; AST-1616436) ; 11403072 ; 11403072 ; 11373032) ; 11373032) ; 973 Program of China(2014CB845700) ; 973 Program of China(2014CB845700) ; National Natural Science Foundation of China(11333003 ; National Natural Science Foundation of China(11333003 ; CASSACA ; CASSACA ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; CAS/SAFEA ; CAS/SAFEA ; Shanghai Yangfan Research Grant(14YF1407700) ; Shanghai Yangfan Research Grant(14YF1407700) ; LAMOST ; LAMOST ; NSF(AST-1109718 ; NSF(AST-1109718 ; Chilean BASAL Centro de Excelencia en Astrofisica y Tecnologias Afines (CATA)(PFB-06/2007) ; Chilean BASAL Centro de Excelencia en Astrofisica y Tecnologias Afines (CATA)(PFB-06/2007) ; Fondecyt(1170518) ; Fondecyt(1170518) ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; University of Utah ; University of Utah ; 11390372 ; 11390372 ; AST-1312863 ; AST-1312863 ; 11322326 ; 11322326 ; AST-1616436) ; AST-1616436) ; 11403072 ; 11403072 ; 11373032) ; 11373032)
DOI10.3847/1538-4357/aa88c7
关键词[WOS]SAGITTARIUS DWARF GALAXY ; N-BODY SIMULATIONS ; MILKY-WAY ; LOCAL STANDARD ; GALACTIC BULGE ; SKY SURVEY ; BAR ; EVOLUTION ; NITROGEN ; STELLAR
收录类别SCI
语种英语
资助者973 Program of China(2014CB845700) ; 973 Program of China(2014CB845700) ; National Natural Science Foundation of China(11333003 ; National Natural Science Foundation of China(11333003 ; CASSACA ; CASSACA ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; CAS/SAFEA ; CAS/SAFEA ; Shanghai Yangfan Research Grant(14YF1407700) ; Shanghai Yangfan Research Grant(14YF1407700) ; LAMOST ; LAMOST ; NSF(AST-1109718 ; NSF(AST-1109718 ; Chilean BASAL Centro de Excelencia en Astrofisica y Tecnologias Afines (CATA)(PFB-06/2007) ; Chilean BASAL Centro de Excelencia en Astrofisica y Tecnologias Afines (CATA)(PFB-06/2007) ; Fondecyt(1170518) ; Fondecyt(1170518) ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; University of Utah ; University of Utah ; 11390372 ; 11390372 ; AST-1312863 ; AST-1312863 ; 11322326 ; 11322326 ; AST-1616436) ; AST-1616436) ; 11403072 ; 11403072 ; 11373032) ; 11373032) ; 973 Program of China(2014CB845700) ; 973 Program of China(2014CB845700) ; National Natural Science Foundation of China(11333003 ; National Natural Science Foundation of China(11333003 ; CASSACA ; CASSACA ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; CAS/SAFEA ; CAS/SAFEA ; Shanghai Yangfan Research Grant(14YF1407700) ; Shanghai Yangfan Research Grant(14YF1407700) ; LAMOST ; LAMOST ; NSF(AST-1109718 ; NSF(AST-1109718 ; Chilean BASAL Centro de Excelencia en Astrofisica y Tecnologias Afines (CATA)(PFB-06/2007) ; Chilean BASAL Centro de Excelencia en Astrofisica y Tecnologias Afines (CATA)(PFB-06/2007) ; Fondecyt(1170518) ; Fondecyt(1170518) ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; University of Utah ; University of Utah ; 11390372 ; 11390372 ; AST-1312863 ; AST-1312863 ; 11322326 ; 11322326 ; AST-1616436) ; AST-1616436) ; 11403072 ; 11403072 ; 11373032) ; 11373032)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000411520600002
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/20115
专题星系宇宙学研究部
作者单位1.Chinese Acad Sci, Key Lab Res Galaxies & Cosmol, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Univ Chinese Acad Sci, Coll Astron & Space Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, Kay Lab Opt Astron, Beijing 100012, Peoples R China
4.Tsinghua Univ, Dept Phys, Ctr Astrophys, Beijing 10086, Peoples R China
5.Univ Manchester, Jodrell Bank Ctr Astrophys, Sch Phys & Astron, Oxford Rd, Manchester M13 9PL, Lancs, England
6.Leibniz Inst fur Astrophy Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany
7.Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
8.Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA
9.Univ Utah, Dept Phys & Astron, 115 S 1400 E, Salt Lake City, UT 84112 USA
10.Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile
11.Univ Virginia, Dept Astron, POB 400325, Charlottesville, VA 22904 USA
12.Univ La Serena, Fac Ciencias, Dept Fis, Cisternas 1200, La Serena, Chile
13.Univ Cote Azur, CNRS, Lab Lagrange, Observ Cote Azur, Blvd Observ, F-06304 Nice, France
14.Natl Opt Astron Observ, 950 North Cherry Ave, Tucson, AZ 85719 USA
15.Univ Autonoma Chile, Fac Ingn, Pedro Valdivia 425, Santiago, Chile
16.Apache Point Observ, POB 59, Sunspot, NM 88349 USA
17.New Mexico State Univ, POB 59, Sunspot, NM 88349 USA
18.Moscow MV Lomonosov State Univ, Sternberg Astron Inst, Moscow, Russia
19.Max Planck Inst Astron, Konigstuhl 17 17, D-69117 Heidelberg, Germany
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Zhou, Yingying,Shen, Juntai,Liu, Chao,et al. Chemical Abundances and Ages of the Bulge Stars in APOGEE High-velocity Peaks[J]. ASTROPHYSICAL JOURNAL,2017,847(1).
APA Zhou, Yingying.,Shen, Juntai.,Liu, Chao.,Li, Zhao-Yu.,Mao, Shude.,...&Bizyaev, D. V..(2017).Chemical Abundances and Ages of the Bulge Stars in APOGEE High-velocity Peaks.ASTROPHYSICAL JOURNAL,847(1).
MLA Zhou, Yingying,et al."Chemical Abundances and Ages of the Bulge Stars in APOGEE High-velocity Peaks".ASTROPHYSICAL JOURNAL 847.1(2017).
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