北京-亚利桑那巡天和Mayall z波段遗留巡天的光度校准
Photometric calibration for the Beijing-Arizona Sky Survey and Mayall z-band Legacy Survey
摘要：
本文介绍了北京-亚利桑那巡天（BASS）和Mayall z波段遗留巡天（MzLS）的测光校准，这两个巡天是为暗能量光谱仪（DESI）项目提供基线目标数据的三个宽视场光学遗留成像巡天中的两个。我们的光度校准方法分为外部和内部过程。前者利用Pan-STARRS 1巡天（PS1）的点源天体作为参考标准，获得单个照射量的绝对通量零点。然后，后者根据多个切片和大偏移重叠修改零点，使其在整个测量中保持一致。我们的过程在大部分天空中实现了均匀的光度校准，g和r波段的精度优于10 mmag，z波段的精度优于15 mmag。在大部分测量区域，在亮端（16-18等）的校准精度优于1%。
英文摘要：
We present the photometric calibration of the Beijing-Arizona Sky Survey (BASS) and Mayall z-band Legacy Survey (MzLS), which are two of the three wide-field optical legacy imaging surveys to provide the baseline targeting data for the Dark Energy Spectroscopic Instrument (DESI) project. The method of our photometric calibration is subdivided into the external and internal processes. The former utilizes the point-source objects of Pan-STARRS1 survey (PS1) as the reference standards to achieve the zero points of the absolute flux for individual exposures. And then the latter revise the zero points to make them consistent across the survey based on multiple tilings and large offset overlaps. Our process achieves a homogeneous photometric calibration over most of the sky with precision better than 10 mmag for g and r bands, 15 mmag for z band. The accuracy of the calibration is better than 1% at the bright end (16-18 mag) over most of the survey area.
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