The Dark Energy Spectroscopic Instrument (DESI) will execute a nearly magnitude-limited survey of low redshift galaxies (0.05≤z≤0.4, median z≈0.2). Clustering analyses of this Bright Galaxy Survey (BGS) will yield the most precise measurements to date of baryon acoustic oscillations and redshift-space distortions at low redshift. DESI BGS will comprise two target classes: (i) BRIGHT (r<19.5 mag), and (ii) FAINT (19.5<r<20 mag). Here we present a summary of the star-galaxy separation, and different photometric and geometrical masks, used in BGS to reduce the number of spurious targets. The selection results in a total density of ∼800 objects deg⁻² for the BRIGHT and ∼600 objects deg⁻² for the FAINT selections. A full characterization of the BGS selection can be found in Ruiz-Macias et al.

暗能量光谱仪 (DESI) 将对低红移星系（0.05≤ z ≤0.4，中值z ≈0.2）进行近乎震级限制的调查。此次明亮星系巡天 (BGS) 的聚类分析将产生迄今为止最精确的重子声学振荡和低红移下的红移空间畸变的测量结果。DESI BGS 将包括两个目标类别：(i) BRIGHT ( r <19.5 mag)，和 (ii) FAINT (19.5< r <20 mag)。在这里，我们总结了 BGS 中用于减少虚假目标数量的星-星系分离以及不同的光度和几何掩模。选择导致BRIGHT的总密度为 800 个对象 deg ^-2和 600 个对象 deg ^-2对于 FAINT 选择。可以在 Ruiz-Macias 等人中找到 BGS 选择的完整特征。