论文标题
观察传统调查的策略
Observing Strategy for the Legacy Surveys
论文作者
论文摘要
传统调查是三个基于地面成像调查的组合，在三个光学频段（$ g $，$ r $和$ z $）中绘制了16,000度$^2 $，以比Sloan Digital Sky Survey（SDSS）更深入1- $ 2 $ 〜MAG。我们的工作解决了在地面观测站进行的宽视野成像调查的主要挑战之一：不同的深度是由于在地球结合地点的观察条件变化而产生的。为了减轻这些效果，两项传统调查（黑暗能源摄像机的遗产调查或贴花；以及Mayall $ z $ - band遗产调查或MZLS）采用了独特的策略，以响应不断变化的观察条件，以尽可能快速地调节曝光时间。我们介绍了这些调查使用的平铺和观察策略。我们证明，与使用固定暴露时间的传统方法相比，铺平和动态观察策略共同导致更统一的深度调查，在给定的总观察时间中具有更高的效率。
The Legacy Surveys, a combination of three ground-based imaging surveys, have mapped 16,000 deg$^2$ in three optical bands ($g$, $r$, and $z$) to a depth 1--$2$~mag deeper than the Sloan Digital Sky Survey (SDSS). Our work addresses one of the major challenges of wide-field imaging surveys conducted at ground-based observatories: the varying depth that results from varying observing conditions at Earth-bound sites. To mitigate these effects, two of the Legacy Surveys (the Dark Energy Camera Legacy Survey, or DECaLS; and the Mayall $z$-band Legacy Survey, or MzLS) employed a unique strategy to dynamically adjust the exposure times as rapidly as possible in response to the changing observing conditions. We present the tiling and observing strategies used by these surveys. We demonstrate that the tiling and dynamic observing strategies jointly result in a more uniform-depth survey that has higher efficiency for a given total observing time compared with the traditional approach of using fixed exposure times.
