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
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| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
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| 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 |
| 推荐引用方式 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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