PAU巡天：在COSMOS场中光度红移性能的早期验证
The PAU Survey: Early demonstration of photometric redshift performance in the COSMOS field
摘要：
PAU巡天（PAUS）是一项创新的测光巡天，在威廉赫歇尔望远镜（WHT）上有40个窄带。窄谱带的间隔为100，覆盖4500到8500的范围，与标准的宽谱带结合，可以实现出色的红移精度。本文介绍了用于从PAUS确定早期光度红移的技术、星系模板和附加的光度校准。使用BCNz 2，一个新的光度红移代码开发的目的，我们使用PAUS数据的COSMOS领域的光度红移性能。与来自zCOSMOS DR 3的安全光谱的比较表明，当基于光度红移质量切割选择最佳50%的源时，PAUS实现了$σ_{68} /(1+z) = 0.0037$到$i_{\mathrm{AB}} < 22.5$。此外，对于明亮和高质量的选择，获得了更高的光z精度（$σ_{68}/(1+z) \sim 0.001$），这是由发射线的识别驱动的。我们得出结论，PAUS符合其设计目标，开辟了一个迄今为止未知的制度深，宽，密集的星系调查与精确的红移，将提供独特的见解星系的形成，演化和集群，以及它们的内在排列。
英文摘要：
The PAU Survey (PAUS) is an innovative photometric survey with 40 narrow bands at the William Herschel Telescope (WHT). The narrow bands are spaced at 100Å intervals covering the range 4500Å to 8500Å and, in combination with standard broad bands, enable excellent redshift precision. This paper describes the technique, galaxy templates and additional photometric calibration used to determine early photometric redshifts from PAUS. Using BCNz2, a new photometric redshift code developed for this purpose, we characterise the photometric redshift performance using PAUS data on the COSMOS field. Comparison to secure spectra from zCOSMOS DR3 shows that PAUS achieves $σ_{68} /(1+z) = 0.0037$ to $i_{\mathrm{AB}} < 22.5$ when selecting the best 50% of the sources based on a photometric redshift quality cut. Furthermore, a higher photo-z precision ($σ_{68}/(1+z) \sim 0.001$) is obtained for a bright and high quality selection, which is driven by the identification of emission lines. We conclude that PAUS meets its design goals, opening up a hitherto uncharted regime of deep, wide, and dense galaxy survey with precise redshifts that will provide unique insights into the formation, evolution and clustering of galaxies, as well as their intrinsic alignments.
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