Using neural networks based template matching method to obtain redshifts of normal galaxies

	Using neural networks based template matching method to obtain redshifts of normal galaxies
	Xu, X ; Luo, AL ; Wu, FC; Zhao, YH
刊名	SPECTROSCOPY AND SPECTRAL ANALYSIS
	2005-06-01
卷号	25 期号:6 页码:996-1001
关键词	normal galaxy principal component analysis(PCA) probabilistic neural networks classification of redshifts template matching
英文摘要	Galaxies can be divided into two classes: normal galaxy (NG) and active galaxy (AG). In order to determine NG redshifts, an automatic effective method is proposed in this paper, which consists of the following three main steps: (1) From the template of normal galaxy, the two sets of samples are simulated, one with the redshift of 0. 0-0. 3, the other of 0. 3-0. 5, then the PCA is used to extract the main components, and train samples are projected to the main component subspace to obtain characteristic spectra. (2) The characteristic spectra are used to train a Probabilistic Neural Network to obtain a Bayes classifier. (3) An unknown real NG spectrum is first inputted to this Bayes classifier to determine the possible range of redshift, then the template matching is invoked to locate the redshift value within the estimated range. Compared with the traditional template matching technique with an unconstrained range, our proposed method not only halves the computational load, but also increases the estimation accuracy. As a result, the proposed method is particularly useful for automatic spectrum processing produced from a large-scale sky survey project.
WOS标题词	Science & Technology ; Technology
类目[WOS]	Spectroscopy
研究领域[WOS]	Spectroscopy
关键词[WOS]	AUTOMATED CLASSIFICATION ; SPECTRAL CLASSIFICATION ; STELLAR SPECTRA
收录类别	SCI
语种	英语
WOS记录号	WOS:000230381500050
公开日期	2015-12-24
内容类型	期刊论文
源URL	[http://ir.ia.ac.cn/handle/173211/9068]
专题	自动化研究所_09年以前成果
作者单位	1.Chinese Acad Sci, Inst Automat, Natl Lab Pattern Recognit, Beijing 100080, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
推荐引用方式 GB/T 7714	Xu, X,Luo, AL,Wu, FC,et al. Using neural networks based template matching method to obtain redshifts of normal galaxies[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS,2005,25(6):996-1001.
APA	Xu, X,Luo, AL,Wu, FC,&Zhao, YH.(2005).Using neural networks based template matching method to obtain redshifts of normal galaxies.SPECTROSCOPY AND SPECTRAL ANALYSIS,25(6),996-1001.
MLA	Xu, X,et al."Using neural networks based template matching method to obtain redshifts of normal galaxies".SPECTROSCOPY AND SPECTRAL ANALYSIS 25.6(2005):996-1001.