中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Constraining the Galactic structure parameters with the XSTPS-GAC and SDSS photometric surveys

文献类型:期刊论文

作者Chen, B. -Q.1; Liu, X. -W.1,2; Yuan, H. -B.3; Robin, A. C.4; Huang, Y.1; Xiang, M. -S.5; Wang, C.1; Ren, J. -J.1,5; Tian, Z. -J.1; Zhang, H. -W.1
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2017
卷号464期号:3页码:2545-2556
关键词Galaxy: disc Galaxy: fundamental parameters Galaxy: structure
英文摘要Photometric data from the Xuyi Schmidt Telescope Photometric Survey of the Galactic Anticentre (XSTPS-GAC) and the Sloan Digital Sky Survey (SDSS) are used to derive the global structure parameters of the smooth components of the Milky Way. The data, which cover nearly 11 000 deg(2) sky area and the full range of Galactic latitude, allow us to construct a globally representative Galactic model. The number density distribution of Galactic halo stars is fitted with an oblate spheroid that decays by power law. The best fitting yields an axis ratio and a power-law index kappa = 0.65 and p = 2.79, respectively. The r-band differential star counts of three dwarf samples are then fitted with a Galactic model. The best-fitting model yielded by a Markov Chain Monte Carlo analysis has thin and thick disc scale heights and lengths of H-1 = 322 pc and L-1 = 2343 pc, H-2 = 794 pc and L-2 = 3638 pc, a local thick-to-thin disc density ratio of f(2) = 11 per cent, and a local density ratio of the oblate halo to the thin disc of f(h) = 0.16 per cent. The measured star count distribution, which is in good agreement with the above model for most of the sky area, shows a number of statistically significant large-scale overdensities, including some of the previously known substructures, such as the Virgo overdensity and the so-called 'north near structure', and a new feature between 150 degrees < l < 240 degrees and -1 degrees < b < -5 degrees, at an estimated distance between 1.0 and 1.5 kpc. The Galactic North-South asymmetry in the anticentre is even stronger than previously thought.
WOS标题词Science & Technology ; Physical Sciences
类目[WOS]Astronomy & Astrophysics
研究领域[WOS]Astronomy & Astrophysics
关键词[WOS]DIGITAL SKY SURVEY ; ANTICENTER STELLAR STRUCTURE ; EXPLORING HALO SUBSTRUCTURE ; NUMBER DENSITY DISTRIBUTION ; STAR COUNTS REDIVIVUS ; MILKY-WAY TOMOGRAPHY ; MODEL PARAMETERS ; EXTINCTION COEFFICIENTS ; METALLICITY GRADIENTS ; TRIANGULUM-ANDROMEDA
收录类别SCI
语种英语
WOS记录号WOS:000393647600002
源URL[http://ir.bao.ac.cn/handle/114a11/8291]  
专题国家天文台_光学天文研究部
作者单位1.Peking Univ, Dept Astron, Beijing 100871, Peoples R China
2.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
3.Beijing Normal Univ, Dept Astron, Beijing 100875, Peoples R China
4.Univ Bourgogne Franche Comte, OSU THETA, UMR6213, CNRS,Inst Utinam,Observ Besancon, F-25010 Besancon, France
5.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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GB/T 7714
Chen, B. -Q.,Liu, X. -W.,Yuan, H. -B.,et al. Constraining the Galactic structure parameters with the XSTPS-GAC and SDSS photometric surveys[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,464(3):2545-2556.
APA Chen, B. -Q..,Liu, X. -W..,Yuan, H. -B..,Robin, A. C..,Huang, Y..,...&Zhang, H. -W..(2017).Constraining the Galactic structure parameters with the XSTPS-GAC and SDSS photometric surveys.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,464(3),2545-2556.
MLA Chen, B. -Q.,et al."Constraining the Galactic structure parameters with the XSTPS-GAC and SDSS photometric surveys".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 464.3(2017):2545-2556.

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来源:国家天文台

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