Overview of the DESI Legacy Imaging Surveys
Overview of the DESI Legacy Imaging Surveys
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DESI 传统成像调查概述
DOI：
10.3847/1538-3881/ab089d
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发表时间：
2019-05-01
影响因子：
5.3
通讯作者：
Zhou, Zhimin
中科院分区：
文献类型：
--
作者：
Dey, Arjun;Schlegel, David J.;Zhou, Zhimin
DESI遗产成像巡天（http：//legacysurvey.org/）是三个公共项目（暗能量照相机遗产巡天、北京-亚利桑那巡天和梅亚尔z波段遗产巡天）的组合，将使用基特峰国家天文台和托洛洛山美洲天文台的望远镜，在三个光学波段（g、r和z）联合拍摄从北方半球可见的河外天空的约14，000 deg（2）。合并的勘测足迹被银河平面分成两个连续的区域。光学成像是使用一种独特的策略进行的，该策略在观察期间动态调整曝光时间和指向选择，从而导致几乎均匀深度的调查。除了校准图像，该项目还提供了一个目录，该目录是通过使用基于概率推理的方法来估计源的形状和亮度而构建的。该目录包括测光从grz光学波段和从四个中红外波段（在3.4，4.6，12，和22 μ m）观测的广域红外巡天探测卫星在其整个运行寿命。该项目计划每年发布两次公开数据。用于生成星表的所有软件也随数据一起发布。本文概述了遗留调查项目。
The DESI Legacy Imaging Surveys (http://legacysurvey.org/) are a combination of three public projects (the Dark Energy Camera Legacy Survey, the Beijing-Arizona Sky Survey, and the Mayall z-band Legacy Survey) that will jointly image approximate to 14,000 deg(2) of the extragalactic sky visible from the northern hemisphere in three optical bands (g, r, and z) using telescopes at the Kitt Peak National Observatory and the Cerro Tololo Inter-American Observatory. The combined survey footprint is split into two contiguous areas by the Galactic plane. The optical imaging is conducted using a unique strategy of dynamically adjusting the exposure times and pointing selection during observing that results in a survey of nearly uniform depth. In addition to calibrated images, the project is delivering a catalog, constructed by using a probabilistic inference-based approach to estimate source shapes and brightnesses. The catalog includes photometry from the grz optical bands and from four mid-infrared bands (at 3.4, 4.6, 12, and 22 mu m) observed by the Wide-field Infrared Survey Explorer satellite during its full operational lifetime. The project plans two public data releases each year. All the software used to generate the catalogs is also released with the data. This paper provides an overview of the Legacy Surveys project.