表征暗能量光谱仪器亮星系巡天的目标选择管道
Characterising the target selection pipeline for the Dark Energy Spectroscopic Instrument Bright Galaxy Survey
摘要：
我们提出的步骤，以产生一个可靠的和完整的输入星系目录的暗能量光谱仪（DESI）明亮的星系调查（BGS）使用测光传统调查DR8 DECam。我们分析了一些主要的问题所面临的选择目标的DESI BGS，如恒星星系分离，污染的碎片恒星和明亮的星系。我们的管道利用了一种新的方法来选择使用盖亚测光的BGS星系，我们实现了几何和光度掩模，以减少虚假对象的数量。由此产生的目录是交叉匹配的星系和质量大会（GAMA）的调查，以评估星系目录的完整性和目标选择的性能。通过与模拟星表和Sloan数字巡天（SDSS）数据的比较，我们也验证了BGS星表中源的聚类。最后，通过量化目标星系密度对成像和其他属性的依赖性来评估BGS选择标准的鲁棒性。我们发现的最大的系统相关性是在高恒星密度区域中目标密度的7%抑制。
英文摘要：
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.
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