论文标题
使用GAIA的基于地面调查数据的校准：应用于DES
Calibration of ground based survey data using Gaia: Application to DES
论文作者
论文摘要
在整个调查区域，基于地面的光学成像数据校准了10 mmAg的光度准确性，并且在VIS焦平面的规模上，校准了比5 mmag更好的颜色均匀性，这是欧几里得任务的关键科学要求。这些精度使星系的稳定光度红移和颜色依赖性VIS PSF的建模用于弱透镜研究。我们使用GAIA光度法来校准黑暗能源调查（DES）数据的$ g/r/i/z $幅度，以满足严格的欧几里得要求。 GAIA G带大小以及在DES单个时期（SE）暴露中观察到的恒星的BP-RP颜色信息用于得出从GAIA到DES光度计的转化，用于单个CCD的DES光度计，并表征整个DECAM局灶性平面上持续的光度误差。我们使用这些持续错误的颜色依赖性来表征整个DECAM焦平面上的$ g/r/i/z $ bandass变化。
The calibration of ground based optical imaging data to photometric accuracy of 10 mmag over the full survey area and to color uniformity better than 5 mmag on the scale of the VIS focal plane is a key science requirement for the Euclid mission. These accuracies enable stable photometric redshifts of galaxies and modeling of the color dependent VIS PSF for weak lensing studies. We use the Gaia photometry to calibrate the $g/r/i/z$ magnitudes of Dark Energy Survey (DES) data to meet the stringent Euclid requirements. The Gaia G band magnitude along with the BP-RP color information of stars observed in the DES single epoch (SE) exposures are used to derive the transformation from Gaia to DES photometry for individual CCDs and to characterize persistent photometric errors across the DECam focal plane. We use the color dependence of these persistent errors to characterize the $g/r/i/z$ bandpass variations across the DECam focal plane.
