Reducing the Searching Range of Supernova Candidates Automatically in a Flood of Spectra of Galaxies
TU Liang-ping1，2，3,LUO A-li3,WU Fu-chao1,ZHAO Yong-heng3
1. Institute of Automation, Chinese Academy of Sciences, Beijing 100190, China 2. School of Science, University of Science and Technology Liaoning, Anshan 144051, China 3. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
Abstract：Supernova (SN) is one of the most intense astronomical phenomena among the known stellar activities, but compared with several billion astronomical objects which people have probed, the number of supernova the authors have observed is very small. Therefore, the authors need to find faster and higher-efficiency approaches to searching supernova. In the present paper, we present a novel automated method, which can be successfully used to reduce the range of searching for la supernova candidates in a huge number of galaxy spectra. The theoretical basis of the method is clustering and outlier picking, by introducing and measuring local outlier factors of data samples, description of statistic characters of SN emerges in low dimension space. Firstly, eigenvectors of Peter’s la supernova templates are acquired through PCA projection, and the description of la supernova’s statistic characters is calculated. Secondly, in all data set, the local outlier factor (LOF) of each galaxy is calculated including those SN and their host galaxy spectra, and all LOFs are arranged in descending order. Finally, spectra with the largest first one percent of all LOFs should be the reduced la SN candidates. Experiments show that this method is a robust and correct range reducing method, which can get rid of the galaxy spectra without supernova component automatically in a flood of galaxy spectra. It is a highly efficient approach to getting the reliable candidates in a spectroscopy survey for follow-up photometric observation.
屠良平1，2，3，罗阿理3，吴福朝1，赵永恒3 . 海量星系光谱中的超新星候选范围自动约减[J]. 光谱学与光谱分析, 2009, 29(12): 3420-3423.
TU Liang-ping1，2，3,LUO A-li3,WU Fu-chao1,ZHAO Yong-heng3 . Reducing the Searching Range of Supernova Candidates Automatically in a Flood of Spectra of Galaxies . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2009, 29(12): 3420-3423.
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