Searching QSO Candidates and Calculating Their Redshfit from a Flood of Spectra
SONG Yi-han1,2,3, LUO A-li1,2, ZHAO Yong-heng1,2
1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 2. Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China 3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：In the present paper the author offers a method to search the QSO candidates and calculate their redshfit using their broad emission lines which are the most important character of quasars. It is hard to identify the lines in the quasar’s spectra due to their redshifts distributing on a broad range. Spectra contain two components. One is continuum and the other is lines. The author uses a method of LFPS (low frequency points set) to build the continuum and detect the obvious emission lines, a method that can avoid the broad emission lines as a part of the continuum. The redshift can be calculated by comparing the extracted lines with the line table. The classification can be done with both emission lines and the redshift. For a better accurate rate to recognize the lines, this paper provides a method to estimate the level of the local noise. The method this paper used is independent of the flux calibration of the spectra. It can work for the spectra of the present LAMOST.
Key words：Broad emission line;LFPS;Standard deviation space;Matching line table
宋轶晗1,2,3，罗阿理1,2，赵永恒1,2 . 一种海量光谱中类星体候选体红移测量与识别的算法[J]. 光谱学与光谱分析, 2011, 31(09): 2578-2581.
SONG Yi-han1,2,3, LUO A-li1,2, ZHAO Yong-heng1,2 . Searching QSO Candidates and Calculating Their Redshfit from a Flood of Spectra . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(09): 2578-2581.
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