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Preliminary Target Selection for the DESI Bright Galaxy Survey (BGS)
Research Notes of the AAS Pub Date : 2020-10-20 , DOI: 10.3847/2515-5172/abc25a
Omar Ruiz-Macias 1, 2 , Pauline Zarrouk 1 , Shaun Cole 1 , Peder Norberg 1, 3 , Carlton Baugh 1, 2 , David Brooks 4 , Arjun Dey 5 , Yutong Duan 6 , Sarah Eftekharzadeh 7 , Daniel J. Eisenstein 8 , Jaime E. Forero-Romero 9 , Enrique Gaztaaga 10, 11 , ChangHoon Hahn 12, 13 , Robert Kehoe 14 , Martin Landriau 12 , Dustin Lang 15, 16 , Michael E. Levi 12 , John Lucey 3 , Aaron M. Meisner 5 , John Moustakas 17 , Adam D. Myers 18 , Nathalie Palanque-Delabrouille 19 , Claire Poppett 20 , Francisco Prada 21 , Anand Raichoor 22 , David J. Schlegel 12 , Michael Schubnell 23 , Gregory Tarl 24 , David H. Weinberg 25 , M. J. Wilson 12, 13 , Christophe Yche 19
Affiliation  

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.



中文翻译:

DESI 明亮星系调查 (BGS) 的初步目标选择

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。

更新日期:2020-10-20
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