论文标题
表征黑色能源仪器明亮星系调查的目标选择管道
Characterising the target selection pipeline for the Dark Energy Spectroscopic Instrument Bright Galaxy Survey
论文作者
论文摘要
我们介绍了使用光度法遗产调查DR8 DECAM，为黑暗能量光谱仪器（DESI）明亮的星系调查（BGS）生成可靠且完整的输入星系目录所采取的步骤。我们分析了选择DESI BG的目标中面临的一些主要问题，例如星 - 甲变素的分离，碎片碎片污染和明亮的星系。我们的管道利用一种使用GAIA光度法选择BGS星系的新方法，我们实施了几何和光度掩模，从而减少了杂物对象的数量。与银河系和质量组装（GAMA）调查相交，以评估星系目录的完整性和目标选择的性能。我们还通过与模拟目录和Sloan Digital Sky Survey（SDSS）数据进行比较来验证BGS目录中源的聚类。最后，通过量化目标星系密度对成像和其他特性的依赖性来评估BGS选择标准的鲁棒性。我们发现的最大系统相关性是高恒星密度区域中目标密度的7％抑制。
We present the steps taken to produce a reliable and complete input galaxy catalogue for the Dark Energy Spectroscopic Instrument (DESI) Bright Galaxy Survey (BGS) using the photometric Legacy Survey DR8 DECam. We analyse some of the main issues faced in the selection of targets for the DESI BGS, such as star-galaxy separation, contamination by fragmented stars and bright galaxies. Our pipeline utilizes a new way to select BGS galaxies using Gaia photometry and we implement geometrical and photometric masks that reduce the number of spurious objects. The resulting catalogue is cross-matched with the Galaxy And Mass Assembly (GAMA) survey to assess the completeness of the galaxy catalogue and the performance of the target selection. We also validate the clustering of the sources in our BGS catalogue by comparing with mock catalogues and the Sloan Digital Sky Survey (SDSS) data. Finally, the robustness of the BGS selection criteria is assessed by quantifying the dependence of the target galaxy density on imaging and other properties. The largest systematic correlation we find is a 7 per cent suppression of the target density in regions of high stellar density.
