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Alternative TitleThe SExtractor and Its Applications in Deep Sky Surveys
阮志锋; 邬文弢
Source Publication天文研究与技术(Astronomical Research & Technology)
Contribution Rank第1完成单位
Indexed ByCSCD
Keyword目标检测 深度巡天 光度学


Other Abstract

Deep sky surveys provide fundamental data for studies of formation and evolution of galaxies,galaxy clusters,large-scale structures of the universe,and supermassive black holes. The SExtractor software package is an open-source software system. It can build a catalogue of objects from a sky-survey image and output magnitudes,surface coordinates,sizes,shape descriptions,and other information of objects. The SExtractor has been widely used for detection and measurement of objects in deep sky surveys. For object detection and measurement, abilities to detect objects( for completeness) and to separate objects of superimposed profiles( for resolving confusion) often have a larger impact on results than measurement errors due to photon noise. This requires certain balance between the abilities to detect objects and to separate objects of superimposed profiles. When using the SExtractor,the parameter values should then vary according to different types of objects so as to optimize detection and measurement. To detect apparently small faint objects,low detection thresholds need to be adopted,but low detection thresholds can lead to overdeblending of highredshift galaxies of complex inner structures,or confusion of outer features of bright galaxies / scattered-light features of bright stars to be independent objects. Particularly,overdeblending can cause severe contamination in statistics of high-redshift close pairs identified from deep sky surveys. Confusion from parts of bright galaxies and scattered-light features of stars can be avoided by flexible settings of SExtractor parameter values.Overdeblending of faint galaxies of complex structures remains a difficult problem though. In this paper,we systematically describe the principles and parameters of the SExtractor. By incorporating our own analysis we also discuss accuracies and other measurement problems in using the SExtractor. At last,we give some suggestions to those problems.

Funding Project中国科学院知识创新工程重要方向项目[KJCX2-YW-T24]
Funding Organization中国科学院知识创新工程重要方向项目[KJCX2-YW-T24]
Subject Area天文学 ; 天体物理学 ; 实测天体物理学 ; 天文学其他学科
MOST Discipline Catalogue理学 ; 理学::天文学
Citation statistics
Cited Times:1[CSCD]   [CSCD Record]
Document Type期刊论文
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
阮志锋,邬文弢. SExtractor及其在深度巡天研究中的应用[J]. 天文研究与技术(Astronomical Research & Technology),2016,13(2):266-272.
APA 阮志锋,&邬文弢.(2016).SExtractor及其在深度巡天研究中的应用.天文研究与技术(Astronomical Research & Technology),13(2),266-272.
MLA 阮志锋,et al."SExtractor及其在深度巡天研究中的应用".天文研究与技术(Astronomical Research & Technology) 13.2(2016):266-272.
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