Kinematics of RR Lyrae stars in the Galactic bulge with OGLE-IV and Gaia DR2

doi:10.1093/mnras/staa2601

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	Kinematics of RR Lyrae stars in the Galactic bulge with OGLE-IV and Gaia DR2
	Du, Hangci 1,2; Mao, Shude 1,2,3; Athanassoula, E.4; Shen, Juntai 5,6,7,8; Pietrukowicz, Pawel 9
	2020-11-01
Source Publication	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN	0035-8711
Volume	498 Issue:4 Pages:5629-5642
Abstract	We 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.
Keyword	Galaxy: bulge Galaxy: kinematics and dynamics Galaxy: structure
Funding Organization	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 ; 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
DOI	10.1093/mnras/staa2601
WOS Keyword	MILKY-WAY ; PROPER MOTIONS ; MORPHOLOGY ; GALAXY ; ARGOS ; VVV ; POPULATIONS ; LUMINOSITY ; BAR/BULGE ; DENSITY
Language	英语
Funding Project	National 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 Organization	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 ; 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 Area	Astronomy & Astrophysics
WOS Subject	Astronomy & Astrophysics
WOS ID	WOS:000587755500076
Publisher	OXFORD UNIV PRESS
Citation statistics
Document Type	期刊论文
Identifier	http://ir.bao.ac.cn/handle/114a11/81086
Collection	中国科学院国家天文台
Corresponding Author	Du, Hangci
Affiliation	1.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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