An Investigation of the Absolute Proper Motions of the SCUSS Catalog
An Investigation of the Absolute Proper Motions of the SCUSS Catalog
复制标题
SCUSS星表绝对固有运动的研究
DOI：
10.1086/680447
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发表时间：
2015
影响因子：
3.5
通讯作者：
Zhang Ti
中科院分区：
文献类型：
--
作者：
Peng Xiyan;Qi Zhaoxiang;Wu Zhenyu;Ma Jun;Du Cuihua;Zhou Xu;Yu Yong;Tang Zhenghong;Jiang Zhaoji;Zou Hu;Fan Zhou;Fan Xiaohui;Smith Martin C.;Jiang Linhua;Jing Yipeng;Lattanzi Mario G.;McLean Brian J.;Lesser Michael;Nie Jundan;Shen Shiyin;Wang Jiali;Zhang Ti
∼770万个天体的绝对自行是基于南银河帽u波段天空测量的数据和空间望远镜科学研究所从Palomar和UK Schmidt测量板块创建的未压缩数字化天空测量得出的天文测量数据得出的。我们花了大量的精力来修正绝对自行中与位置、大小和颜色有关的系统误差。光谱确认的类星体被用来检验自行的内部系统误差和随机误差。对于μαcosδ和μδ，SCUSS星表中总自行的系统误差估计分别为-0.08ma/yr和-0.06ma/yr。对于μα、cos、δ和μδ，SCUSS星表中自行的随机误差分别估计为4.2mA/年和4.4mAs/年。SCUSS本身运动没有明显的位置、震级和颜色相关的系统误差。本身运动的随机误差从u=18.0 mag时的约3 mAs/yr增加到u=22.0 mag时的约7 mas/yr。比较了SCUSS星表和SDSS星表中恒星的自行，两者高度一致。
Absolute proper motions for∼ 7.7 million objects were derived based on data from the South Galactic Cap u-band Sky Survey (SCUSS) and astrometric data derived from uncompressed Digitized Sky Surveys that the Space Telescope Science Institute (STScI) created from the Palomar and UK Schmidt survey plates. We put a great deal of effort into correcting the position-, magnitude-, and color-dependent systematic errors in the derived absolute proper motions. The spectroscopically confirmed quasars were used to test the internal systematic and random error of the proper motions. The systematic errors of the overall proper motions in the SCUSS catalog are estimated as-0.08 and-0.06 mas/yr for μ α cos δ and μ δ, respectively. The random errors of the proper motions in the SCUSS catalog are estimated independently as 4.2 and 4.4 mas/yr for μ α cos δ and μ δ. There are no obvious position-, magnitude-, and color-dependent systematic errors of the SCUSS proper motions. The random error of the proper motions goes up with the magnitude from about 3 mas/yr at u= 18.0 mag to about 7 mas/yr at u= 22.0 mag. The proper motions of stars in SCUSS catalog are compared with those in the SDSS catalog, and they are highly consistent.