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Sky subtraction for LAMOST
Bai, Zhong-Rui1,2; Zhang, Hao-Tong2; Yuan, Hai-Long2; Li, Guang-Wei2; Chen, Jian-Jun2; Lei, Ya-Juan2; Yang, Hui-Qin2; Dong, Yi-Qiao2; Wang, Gang2; Zhao, Yong-Heng1,2
2017-09-01
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
卷号17期号:9
摘要Sky subtraction is a key technique in data reduction of multi-fiber spectra. Knowledge of characteristics related to the instrument is necessary to determine the method adopted in sky subtraction. In this study, we describe the sky subtraction method designed for the Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) survey. The method has been integrated into the LAMOST 2D Pipeline v2.6 and applied to data from LAMOST DR3 and later. For LAMOST, calibration using sky emission lines is used to alleviate the position-dependent (and thus time-dependent) similar to 4 % fiber throughput uncertainty and small wavelength instability (0.1 angstrom) during observation. Sky subtraction using principal component analysis (PCA) further reduces 2 5 % of the sky line residual from OH lines in the red part of LAMOST spectra after the master sky spectrum, which is derived from a B-spline fit of 20 sky fibers in each spectrograph. Using this approach, values are adjusted by a sky emission line and subtracted from each fiber. Further analysis shows that our wavelength calibration accuracy is about 4.5 km s(-1), and the averages of residuals after sky subtraction are about 3% for sky emission lines and 3% for the continuum region. The relative sky subtraction residuals vary with moonlight background brightness, and can reach as low as 1.5% for regions that have sky emission lines during a dark night. Tests on F stars with both similar sky emission line strength and similar object continuumintensity show that the sky emission line residual of LAMOST is smaller than that of the SDSS survey.
文章类型Article
关键词Techniques: Spectroscopic Methods: Data Analysis Instrumentation: Spectrographs
WOS标题词Science & Technology ; Physical Sciences
资助者National Natural Science Foundation of China (NSFC)(11503054) ; National Natural Science Foundation of China (NSFC)(11503054) ; NSFC Key Program(11333004) ; NSFC Key Program(11333004) ; National Key Basic Research Program of China (Program 973)(2014CB845700) ; National Key Basic Research Program of China (Program 973)(2014CB845700) ; 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 ; National Natural Science Foundation of China (NSFC)(11503054) ; National Natural Science Foundation of China (NSFC)(11503054) ; NSFC Key Program(11333004) ; NSFC Key Program(11333004) ; National Key Basic Research Program of China (Program 973)(2014CB845700) ; National Key Basic Research Program of China (Program 973)(2014CB845700) ; 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
DOI10.1088/1674-4527/17/9/91
关键词[WOS]SPECTROGRAPH WAVELENGTH CALIBRATION ; OPTICAL-FIBER SPECTROSCOPY ; RESOLUTION SPECTRAL ATLAS ; EMISSION-LINES ; OH ; TELESCOPE
收录类别SCI
语种英语
资助者National Natural Science Foundation of China (NSFC)(11503054) ; National Natural Science Foundation of China (NSFC)(11503054) ; NSFC Key Program(11333004) ; NSFC Key Program(11333004) ; National Key Basic Research Program of China (Program 973)(2014CB845700) ; National Key Basic Research Program of China (Program 973)(2014CB845700) ; 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 ; National Natural Science Foundation of China (NSFC)(11503054) ; National Natural Science Foundation of China (NSFC)(11503054) ; NSFC Key Program(11333004) ; NSFC Key Program(11333004) ; National Key Basic Research Program of China (Program 973)(2014CB845700) ; National Key Basic Research Program of China (Program 973)(2014CB845700) ; 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
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000412778300003
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/20097
专题光学天文研究部
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
推荐引用方式
GB/T 7714
Bai, Zhong-Rui,Zhang, Hao-Tong,Yuan, Hai-Long,et al. Sky subtraction for LAMOST[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2017,17(9).
APA Bai, Zhong-Rui.,Zhang, Hao-Tong.,Yuan, Hai-Long.,Li, Guang-Wei.,Chen, Jian-Jun.,...&Zhao, Yong-Heng.(2017).Sky subtraction for LAMOST.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,17(9).
MLA Bai, Zhong-Rui,et al."Sky subtraction for LAMOST".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 17.9(2017).
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