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Constraining the Galactic structure parameters with the XSTPS-GAC and SDSS photometric surveys
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
2017
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号464期号:3页码:2545-2556
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.
文章类型Article
关键词Galaxy: Disc Galaxy: Fundamental Parameters Galaxy: Structure
WOS标题词Science & Technology ; Physical Sciences
资助者National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; China Postdoctoral Science Foundation(2016M590014) ; China Postdoctoral Science Foundation(2016M590014) ; National Natural Science Foundation of China(11443006 ; National Natural Science Foundation of China(11443006 ; National Development and Reform Commission ; National Development and Reform Commission ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; National Science Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; University of Arizona ; University of Arizona ; Brazilian Participation Group ; Brazilian Participation Group ; Brookhaven National Laboratory ; Brookhaven National Laboratory ; Carnegie Mellon University ; Carnegie Mellon University ; University of Florida ; University of Florida ; French Participation Group ; French Participation Group ; German Participation Group ; German Participation Group ; Harvard University ; Harvard University ; Instituto de Astrofisica de Canarias ; Instituto de Astrofisica de Canarias ; Michigan State/Notre Dame/JINA Participation Group ; Michigan State/Notre Dame/JINA Participation Group ; Johns Hopkins University ; Johns Hopkins University ; Lawrence Berkeley National Laboratory ; Lawrence Berkeley National Laboratory ; Max Planck Institute for Astrophysics ; Max Planck Institute for Astrophysics ; Max Planck Institute for Extraterrestrial Physics ; Max Planck Institute for Extraterrestrial Physics ; New Mexico State University ; New Mexico State University ; New York University ; New York University ; Ohio State University ; Ohio State University ; Pennsylvania State University ; Pennsylvania State University ; University of Portsmouth ; University of Portsmouth ; Princeton University ; Princeton University ; Spanish Participation Group ; Spanish Participation Group ; University of Tokyo ; University of Tokyo ; University of Utah ; University of Utah ; Vanderbilt University ; Vanderbilt University ; University of Virginia ; University of Virginia ; University of Washington ; University of Washington ; Yale University ; Yale University ; U1531244) ; U1531244) ; National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; China Postdoctoral Science Foundation(2016M590014) ; China Postdoctoral Science Foundation(2016M590014) ; National Natural Science Foundation of China(11443006 ; National Natural Science Foundation of China(11443006 ; National Development and Reform Commission ; National Development and Reform Commission ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; National Science Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; University of Arizona ; University of Arizona ; Brazilian Participation Group ; Brazilian Participation Group ; Brookhaven National Laboratory ; Brookhaven National Laboratory ; Carnegie Mellon University ; Carnegie Mellon University ; University of Florida ; University of Florida ; French Participation Group ; French Participation Group ; German Participation Group ; German Participation Group ; Harvard University ; Harvard University ; Instituto de Astrofisica de Canarias ; Instituto de Astrofisica de Canarias ; Michigan State/Notre Dame/JINA Participation Group ; Michigan State/Notre Dame/JINA Participation Group ; Johns Hopkins University ; Johns Hopkins University ; Lawrence Berkeley National Laboratory ; Lawrence Berkeley National Laboratory ; Max Planck Institute for Astrophysics ; Max Planck Institute for Astrophysics ; Max Planck Institute for Extraterrestrial Physics ; Max Planck Institute for Extraterrestrial Physics ; New Mexico State University ; New Mexico State University ; New York University ; New York University ; Ohio State University ; Ohio State University ; Pennsylvania State University ; Pennsylvania State University ; University of Portsmouth ; University of Portsmouth ; Princeton University ; Princeton University ; Spanish Participation Group ; Spanish Participation Group ; University of Tokyo ; University of Tokyo ; University of Utah ; University of Utah ; Vanderbilt University ; Vanderbilt University ; University of Virginia ; University of Virginia ; University of Washington ; University of Washington ; Yale University ; Yale University ; U1531244) ; U1531244)
DOI10.1093/mnras/stw2497
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
资助者National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; China Postdoctoral Science Foundation(2016M590014) ; China Postdoctoral Science Foundation(2016M590014) ; National Natural Science Foundation of China(11443006 ; National Natural Science Foundation of China(11443006 ; National Development and Reform Commission ; National Development and Reform Commission ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; National Science Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; University of Arizona ; University of Arizona ; Brazilian Participation Group ; Brazilian Participation Group ; Brookhaven National Laboratory ; Brookhaven National Laboratory ; Carnegie Mellon University ; Carnegie Mellon University ; University of Florida ; University of Florida ; French Participation Group ; French Participation Group ; German Participation Group ; German Participation Group ; Harvard University ; Harvard University ; Instituto de Astrofisica de Canarias ; Instituto de Astrofisica de Canarias ; Michigan State/Notre Dame/JINA Participation Group ; Michigan State/Notre Dame/JINA Participation Group ; Johns Hopkins University ; Johns Hopkins University ; Lawrence Berkeley National Laboratory ; Lawrence Berkeley National Laboratory ; Max Planck Institute for Astrophysics ; Max Planck Institute for Astrophysics ; Max Planck Institute for Extraterrestrial Physics ; Max Planck Institute for Extraterrestrial Physics ; New Mexico State University ; New Mexico State University ; New York University ; New York University ; Ohio State University ; Ohio State University ; Pennsylvania State University ; Pennsylvania State University ; University of Portsmouth ; University of Portsmouth ; Princeton University ; Princeton University ; Spanish Participation Group ; Spanish Participation Group ; University of Tokyo ; University of Tokyo ; University of Utah ; University of Utah ; Vanderbilt University ; Vanderbilt University ; University of Virginia ; University of Virginia ; University of Washington ; University of Washington ; Yale University ; Yale University ; U1531244) ; U1531244) ; National Key Basic Research Program of China(2014CB845700) ; National Key Basic Research Program of China(2014CB845700) ; China Postdoctoral Science Foundation(2016M590014) ; China Postdoctoral Science Foundation(2016M590014) ; National Natural Science Foundation of China(11443006 ; National Natural Science Foundation of China(11443006 ; National Development and Reform Commission ; National Development and Reform Commission ; Alfred P. Sloan Foundation ; Alfred P. Sloan Foundation ; National Science Foundation ; National Science Foundation ; U.S. Department of Energy Office of Science ; U.S. Department of Energy Office of Science ; University of Arizona ; University of Arizona ; Brazilian Participation Group ; Brazilian Participation Group ; Brookhaven National Laboratory ; Brookhaven National Laboratory ; Carnegie Mellon University ; Carnegie Mellon University ; University of Florida ; University of Florida ; French Participation Group ; French Participation Group ; German Participation Group ; German Participation Group ; Harvard University ; Harvard University ; Instituto de Astrofisica de Canarias ; Instituto de Astrofisica de Canarias ; Michigan State/Notre Dame/JINA Participation Group ; Michigan State/Notre Dame/JINA Participation Group ; Johns Hopkins University ; Johns Hopkins University ; Lawrence Berkeley National Laboratory ; Lawrence Berkeley National Laboratory ; Max Planck Institute for Astrophysics ; Max Planck Institute for Astrophysics ; Max Planck Institute for Extraterrestrial Physics ; Max Planck Institute for Extraterrestrial Physics ; New Mexico State University ; New Mexico State University ; New York University ; New York University ; Ohio State University ; Ohio State University ; Pennsylvania State University ; Pennsylvania State University ; University of Portsmouth ; University of Portsmouth ; Princeton University ; Princeton University ; Spanish Participation Group ; Spanish Participation Group ; University of Tokyo ; University of Tokyo ; University of Utah ; University of Utah ; Vanderbilt University ; Vanderbilt University ; University of Virginia ; University of Virginia ; University of Washington ; University of Washington ; Yale University ; Yale University ; U1531244) ; U1531244)
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000393647600002
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8291
专题光学天文研究部
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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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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