加拿大-法国成像调查：来自U波段组件的第一批结果
The Canada-France Imaging Survey: First results from the u-band component
摘要：
加拿大-法国成像巡天将在$u$波段（“CFIS-u”，10，000 $\, {\rm deg^2}$）和$r$波段（“CFIS-r”，5，000 $\, {\rm deg^2}$）绘制银河系北部高纬度天空图，从而能够进行许多独立的科学调查，并为欧几里得飞行任务提供测光红移测定所需的一些地面数据。在这第一个贡献，我们提出了$u$波段的调查组成部分，描述了观测策略，并讨论了一些第一个亮点的结果，根据约三分之一的最终面积。我们发现，银河系的反中心结构是连续分布沿视线，超过20千秒差距，并拥有一个金属丰度分布，基本上是相同的外磁盘APOGEE采样。这表明它可能是一个古老的富含金属的恒星的弯曲盘，而不是一个流或耀斑。我们还讨论了CFIS-u在发现本星系群周围的恒星形成矮星系，银河系的白矮星和蓝离散人口的特性，以及它的敏感性低表面亮度结构的未来潜力在外部星系。
英文摘要：
The Canada-France Imaging Survey (CFIS) will map the northern high Galactic latitude sky in the $u$-band ("CFIS-u", 10,000$\, {\rm deg^2}$) and in the $r$-band ("CFIS-r", 5,000$\, {\rm deg^2}$), enabling a host of stand-alone science investigations, and providing some of the ground-based data necessary for photometric redshift determination for the Euclid mission. In this first contribution we present the $u$-band component of the survey, describe the observational strategy, and discuss some first highlight results, based on approximately one third of the final area. We show that the Galactic anticenter structure is distributed continuously along the line of sight, out to beyond 20 kpc, and possesses a metallicity distribution that is essentially identical to that of the outer disk sampled by APOGEE. This suggests that it is probably a buckled disk of old metal-rich stars, rather than a stream or a flare. We also discuss the future potential for CFIS-u in discovering star-forming dwarf galaxies around the Local Group, the characterization of the white dwarf and blue straggler population of the Milky Way, as well as its sensitivity to low-surface brightness structures in external galaxies.
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