| 光谱学与光谱分析 |
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| A Method for Obtaining Redshifts of Quasars Based on Wavelet Multi-Scaling Feature Matching |
| LIU Zhong-tian1, LI Xiang-ru1, WU Fu-chao1, ZHAO Yong-heng2 |
1. National Laboratory of Pattern Recognition, Institute of Automation, Chinese Academy of Sciences, Beijing 100080, China
2. National Astronomical Observatory, Chinese Academy of Sciences, Beijing 100012, China |
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Abstract The LAMOST project, the world’s largest sky survey project being implemented in China, is expected to obtain 105 quasar spectra. The main objective of the present article is to explore methods that can be used to estimate the redshifts of quasar spectra from LAMOST. Firstly, the features of the broad emission lines are extracted from the quasar spectra to overcome the disadvantage of low signal-to-noise ratio. Then the redshifts of quasar spectra can be estimated by using the multi-scaling feature matching. The experiment with the 15，715 quasars from the SDSS DR2 shows that the correct rate of redshift estimated by the method is 95.13% within an error range of 0.02. This method was designed to obtain the redshifts of quasar spectra with relative flux and a low signal-to-noise ratio, which is applicable to the LAMOST data and helps to study quasars and the large-scale structure of the universe etc.
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Received: 2005-06-06
Accepted: 2005-10-20
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Corresponding Authors:
LIU Zhong-tian
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| Cite this article: |
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LIU Zhong-tian,LI Xiang-ru,WU Fu-chao, et al. A Method for Obtaining Redshifts of Quasars Based on Wavelet Multi-Scaling Feature Matching[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2006, 26(09): 1738-1741.
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| URL: |
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http://www.gpxygpfx.com/EN/Y2006/V26/I09/1738 |
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