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Kinematics of RR Lyrae stars in the Galactic bulge with OGLE-IV and Gaia DR2
Du, Hangci1,2; Mao, Shude1,2,3; Athanassoula, E.4; Shen, Juntai5,6,7,8; Pietrukowicz, Pawel9
2020-11-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume498Issue:4Pages:5629-5642
AbstractWe analyse the kinematics and spatial distribution of 15 599 fundamental-mode RR Lyrae (RRL) stars in the Milky Way bulge by combining OGLE-IV photometric data and Gaia DR2 proper motions. We show that the longitudinal proper motions and the line-of-sight velocities can give similar results for the rotation in the Galactic central regions. The angular velocity of bulge RRLs is found to be around 35 km s(-1) kpc(-1), significantly smaller than that for the majority of bulge stars (50-60 km s(-1) kpc(-1)); bulge RRLs have larger velocity dispersion (120-140 km s(-1)) than younger stars. The dependence of the kinematics of the bulge RRLs on their metallicities is shown by their rotation curves and spatial distributions. Metal-poor RRLs ([Fe/H]<-1) show a smaller bar angle than metal-rich ones. We also find clues suggesting that RRLs in the bulge are not dominated by halo stars. These results might explain some previous conflicting results over bulge RRLs and help understand the chemodynamical evolution of the Galactic bulge.
KeywordGalaxy: bulge Galaxy: kinematics and dynamics Galaxy: structure
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; CNES ; CNES ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; National Science Centre, Poland ; National Science Centre, Poland ; NSFC ; NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CNES ; CNES ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; National Science Centre, Poland ; National Science Centre, Poland ; NSFC ; NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CNES ; CNES ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; National Science Centre, Poland ; National Science Centre, Poland ; NSFC ; NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CNES ; CNES ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; National Science Centre, Poland ; National Science Centre, Poland ; NSFC ; NSFC
DOI10.1093/mnras/staa2601
WOS KeywordMILKY-WAY ; PROPER MOTIONS ; MORPHOLOGY ; GALAXY ; ARGOS ; VVV ; POPULATIONS ; LUMINOSITY ; BAR/BULGE ; DENSITY
Language英语
Funding ProjectNational Natural Science Foundation of China[11773052] ; National Natural Science Foundation of China[11761131016] ; National Natural Science Foundation of China[11333003] ; CNES ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; National Science Centre, Poland[OPUS 2016/23/B/ST9/00655] ; NSFC[11333003] ; NSFC[11390372]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; CNES ; CNES ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; National Science Centre, Poland ; National Science Centre, Poland ; NSFC ; NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CNES ; CNES ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; National Science Centre, Poland ; National Science Centre, Poland ; NSFC ; NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CNES ; CNES ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; National Science Centre, Poland ; National Science Centre, Poland ; NSFC ; NSFC ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; CNES ; CNES ; Newton Advanced Fellowship - Royal Society ; Newton Advanced Fellowship - Royal Society ; Newton Fund ; Newton Fund ; National Science Centre, Poland ; National Science Centre, Poland ; NSFC ; NSFC
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000587755500076
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/81086
Collection中国科学院国家天文台
Corresponding AuthorDu, Hangci
Affiliation1.Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China
2.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China
3.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100101, Peoples R China
4.Aix Marseille Univ, LAM, CNES, CNRS, F-13388 Marseille 13, France
5.Shanghai Jiao Tong Univ, Sch Phys & Astron, Dept Astron, 800 Dongchuan Rd, Shanghai 200240, Peoples R China
6.Shanghai Key Lab Particle Phys & Cosmol, Shanghai 200240, Peoples R China
7.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
8.Univ Chinese Acad Sci, Coll Astron & Space Sci, 19A Yuryuan Rd, Beijing 100049, Peoples R China
9.Univ Warsaw, Astron Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland
Recommended Citation
GB/T 7714
Du, Hangci,Mao, Shude,Athanassoula, E.,et al. Kinematics of RR Lyrae stars in the Galactic bulge with OGLE-IV and Gaia DR2[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,498(4):5629-5642.
APA Du, Hangci,Mao, Shude,Athanassoula, E.,Shen, Juntai,&Pietrukowicz, Pawel.(2020).Kinematics of RR Lyrae stars in the Galactic bulge with OGLE-IV and Gaia DR2.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,498(4),5629-5642.
MLA Du, Hangci,et al."Kinematics of RR Lyrae stars in the Galactic bulge with OGLE-IV and Gaia DR2".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 498.4(2020):5629-5642.
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