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Independent Determination of the Systematic and Random Errors of the Proper Motions in the PPMXL Catalogue Using Quasars
Wu, Zhen-Yu; Ma, Jun; Zhou, Xu
2011-11-01
Source PublicationPUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
Volume123Issue:909Pages:1313-1323
AbstractUsing a sample of 117,053 quasars identified in the PPMXL Catalogue, the systematic errors of the proper motions in the PPMXL Catalogue are estimated independently as -2.0 and -2.1 mas yr(-1) in mu(a) cos delta and mu(delta), respectively. For objects with SDSS r magnitude between 16.0 and 21.0 mag and SDSS g - r color between -0.4 and 1.2, there is no obvious magnitude and color dependence in the systematic errors of the proper motions in the PPMXL Catalogue. The random errors of the proper motions in the PPMXL Catalogue change from -4.0 to similar to 8.0 mas yr(-1), along with the increase of the magnitude of the objects. No color dependence in the random errors of the proper motions in the PPMXL Catalogue is found. There is obvious right-ascension a dependence of the systematic errors in both components of the proper motions in the PPMXL Catalogue. For quasars with declination delta > 0, the systematic errors of mu(delta) in the PPMXL Catalogue increase linearly with delta with a slope of 0.07 mas yr(-1) deg(-1). For comparison, using a subsample of quasars identified in both the PPMXL and SDSS DR7 catalogs, the systematic errors of the USNO-SDSS proper motions in the SDSS DR7 Catalogue are derived as 0.9 and 0.5 mas yr(-1) in mu(alpha) cos delta and mu(delta), respectively. There is no obvious magnitude, color, and alpha dependence in the systematic errors of the USNO-SDSS proper motions. For quasars with declination delta > 0, the systematic errors of mu(delta) in the SDSS DR7 Catalogue increase linearly with delta with a slope of 0.03. The random errors of the USNO-SDSS proper motions change from similar to 2.5 to similar to 6.0 mas yr(-1), along with the change of the magnitude and color of the objects. Combining the 2MASS or SDSS observation data can significantly reduce the systematic errors of the proper motions in the initial photographic catalog.
DOI10.1086/663093
Indexed BySCI
Language英语
WOS IDWOS:000297463500007
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/8000
Collection光学天文研究部
AffiliationChinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Wu, Zhen-Yu,Ma, Jun,Zhou, Xu. Independent Determination of the Systematic and Random Errors of the Proper Motions in the PPMXL Catalogue Using Quasars[J]. PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,2011,123(909):1313-1323.
APA Wu, Zhen-Yu,Ma, Jun,&Zhou, Xu.(2011).Independent Determination of the Systematic and Random Errors of the Proper Motions in the PPMXL Catalogue Using Quasars.PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC,123(909),1313-1323.
MLA Wu, Zhen-Yu,et al."Independent Determination of the Systematic and Random Errors of the Proper Motions in the PPMXL Catalogue Using Quasars".PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC 123.909(2011):1313-1323.
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