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Using neural networks based template matching method to obtain redshifts of normal galaxies
Xu, X; Luo, AL; Wu, FC; Zhao, YH
2005-06-01
发表期刊SPECTROSCOPY AND SPECTRAL ANALYSIS
卷号25期号:6页码:996-1001
文章类型Article
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.
关键词Normal Galaxy Principal Component Analysis(Pca) Probabilistic Neural Networks Classification Of Redshifts Template Matching
WOS标题词Science & Technology ; Technology
关键词[WOS]AUTOMATED CLASSIFICATION ; SPECTRAL CLASSIFICATION ; STELLAR SPECTRA
收录类别SCI
语种英语
WOS研究方向Spectroscopy
WOS类目Spectroscopy
WOS记录号WOS:000230381500050
引用统计
被引频次:5[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ia.ac.cn/handle/173211/9068
专题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
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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.
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