NAOC Open IR
Measuring the local dark matter density with LAMOST DR5 and Gaia DR2
Guo, Rui1,2; Liu, Chao1; Mao, Shude1,3,4; Xue, Xiang-Xiang5; Long, R. J.1,3,4,6; Zhang, Lan1
2020-07-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume495Issue:4Pages:4828-4844
AbstractWe apply the vertical Jeans equation to the kinematics of Milky Way stars in the solar neighbourhood to measure the local dark matter density. More than 90 000 G- and K-type dwarf stars are selected from the cross-matched sample of LAMOST (Large Sky Area Multi-Object Fibre Spectroscopic Telescope) fifth data release and Gaia second data release for our analyses. The mass models applied consist of a single exponential stellar disc, a razor thin gas disc, and a constant dark matter density. We first consider the simplified vertical Jeans equation that ignores the tilt term and assumes a flat rotation curve. Under a Gaussian prior on the total stellar surface density, the local dark matter density inferred from Markov chain Monte Carlo simulations is 0.0133(-0.0022)(+0.0024 )M(circle dot) pc(-3). The local dark matter densities for subsamples in an azimuthal angle range of -10 degrees < phi < 5 degrees are consistent within their 1 sigma errors. However, the northern and southern subsamples show a large discrepancy due to plateaux in the northern and southern vertical velocity dispersion profiles. These plateaux may be the cause of the different estimates of the dark matter density between the north and south. Taking the tilt term into account has little effect on the parameter estimations and does not explain the north and south asymmetry. Taking half of the difference of sigma(z)( )profiles as unknown systematic errors, we then obtain consistent measurements for the northern and southern subsamples. We discuss the influence of the vertical data range, the scale height of the tracer population, the vertical distribution of stars, and the sample size on the uncertainty of the determination of the local dark matter density.
KeywordGalaxy: kinematics and dynamics solar neighbourhood Galaxy: structure
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC
DOI10.1093/mnras/staa1483
WOS KeywordSURFACE MASS DENSITY ; MILKY-WAY ; GALACTIC DISK ; SOLAR NEIGHBORHOOD ; RADIAL-VELOCITIES ; ROTATION CURVE ; SPIRAL ARMS ; HALO ; STARS ; SHAPE
Language英语
Funding ProjectNational Key Research and Development Program of China[2018YFA0404501] ; National Key Research and Development Program of China[2019YFA0405501] ; National Key Research and Development Program of China[2019YFA0405500] ; National Science Foundation of China[11821303] ; National Science Foundation of China[11761131004] ; National Science Foundation of China[11761141012] ; National Science Foundation of China[11835057] ; National Natural Science Foundation of China (NSFC)[11333003] ; National Natural Science Foundation of China (NSFC)[11390372] ; NSFC[11988101] ; NSFC[11873052] ; NSFC[11890694]
Funding OrganizationNational Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Natural Science Foundation of China (NSFC) ; National Natural Science Foundation of China (NSFC) ; NSFC ; NSFC
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000546679500095
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/82938
Collection中国科学院国家天文台
Corresponding AuthorGuo, Rui
Affiliation1.Chinese Acad Sci, Natl Astron Observ, 20A Datun Rd, Beijing 100101, Peoples R China
2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 100049, Peoples R China
3.Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China
4.Tsinghua Univ, Tsinghua Ctr Astrophys, Beijing 100084, Peoples R China
5.Chinese Acad Sci, CAS Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China
6.Univ Manchester, Dept Phys & Astron, Jodrell Bank Ctr Astrophys, Oxford Rd, Manchester M13 9PL, Lancs, England
Recommended Citation
GB/T 7714
Guo, Rui,Liu, Chao,Mao, Shude,et al. Measuring the local dark matter density with LAMOST DR5 and Gaia DR2[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2020,495(4):4828-4844.
APA Guo, Rui,Liu, Chao,Mao, Shude,Xue, Xiang-Xiang,Long, R. J.,&Zhang, Lan.(2020).Measuring the local dark matter density with LAMOST DR5 and Gaia DR2.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,495(4),4828-4844.
MLA Guo, Rui,et al."Measuring the local dark matter density with LAMOST DR5 and Gaia DR2".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 495.4(2020):4828-4844.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Guo, Rui]'s Articles
[Liu, Chao]'s Articles
[Mao, Shude]'s Articles
Baidu academic
Similar articles in Baidu academic
[Guo, Rui]'s Articles
[Liu, Chao]'s Articles
[Mao, Shude]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Guo, Rui]'s Articles
[Liu, Chao]'s Articles
[Mao, Shude]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.