Relative flux calibration for the LAMOST Spectroscopic Survey of the Galactic anticentre

	Relative flux calibration for the LAMOST Spectroscopic Survey of the Galactic anticentre
	Xiang, M. S.1; Liu, X. W.1,2; Yuan, H. B.2; Huo, Z. Y.3; Huang, Y.1 ; Zheng, Y.1; Zhang, H. W.1; Chen, B. Q.1; Zhang, H. H.1; Sun, N. C.1
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2015-03-21
卷号	448 期号:1 页码:90-103
关键词	techniques: spectroscopic Galaxy: disk Galaxy: general surveys
英文摘要	We have developed and implemented an iterative algorithm of flux calibration for the LAMOST Spectroscopic Survey of the Galactic anticentre (LSS-GAC). For a given LSS-GAC plate, the spectra are first processed with a set of nominal spectral response curves (SRCs) and used to derive initial stellar atmospheric parameters (effective temperature T-eff, surface gravity log g and metallicity [Fe/H]) as well as dust reddening E(B - V) of all targeted stars. For each of the 16 spectrographs, several F-type stars with good signal-to-noise ratios are selected as flux standard stars for further, iterative spectral flux calibration. Comparison of spectrophotometric colours, deduced from the flux-calibrated spectra, with the photometric measurements yield average differences of 0.02 +/- 0.07 and -0.04 +/- 0.09 mag for (g - r) and (g - i), respectively. The relatively large negative offset in (g - i) is because we have opted not to correct for the telluric bands, most notably the atmospheric A band in the wavelength range of the i band. Comparison of LSS-GAC multi-epoch observations of duplicate targets indicates that the algorithm has achieved an accuracy of about 10 per cent in relative flux calibration for the wavelength range 4000-9000 angstrom. The shapes of SRCs deduced for individual LAMOST spectrographs vary by up to 30 per cent for a given night, and larger for different nights, indicating that the derivation of SRCs for the individual plates is essential to achieve accurate flux calibration for the LAMOST spectra.
收录类别	SCI
语种	英语
WOS记录号	WOS:000350273500008
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/5718]
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.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China 4.Chinese Acad Sci, Natl Astron Observ, Nanjing Inst Astron Opt & Technol, Nanjing 210042, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Xiang, M. S.,Liu, X. W.,Yuan, H. B.,et al. Relative flux calibration for the LAMOST Spectroscopic Survey of the Galactic anticentre[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2015,448(1):90-103.
APA	Xiang, M. S..,Liu, X. W..,Yuan, H. B..,Huo, Z. Y..,Huang, Y..,...&Li, G. W..(2015).Relative flux calibration for the LAMOST Spectroscopic Survey of the Galactic anticentre.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,448(1),90-103.
MLA	Xiang, M. S.,et al."Relative flux calibration for the LAMOST Spectroscopic Survey of the Galactic anticentre".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 448.1(2015):90-103.