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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
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume17Issue:9
AbstractSky 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.
SubtypeArticle
KeywordTechniques: Spectroscopic Methods: Data Analysis Instrumentation: Spectrographs
WOS HeadingsScience & Technology ; Physical Sciences
Funding OrganizationNational 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
WOS KeywordSPECTROGRAPH WAVELENGTH CALIBRATION ; OPTICAL-FIBER SPECTROSCOPY ; RESOLUTION SPECTRAL ATLAS ; EMISSION-LINES ; OH ; TELESCOPE
Indexed BySCI
Language英语
Funding OrganizationNational 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 Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000412778300003
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/20097
Collection光学天文研究部
Affiliation1.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
Recommended Citation
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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