Exploring the Brighter-fatter Effect with the Hyper Suprime-Cam
Exploring the Brighter-fatter Effect with the Hyper Suprime-Cam
复制标题
使用 Hyper Suprime-Cam 探索更亮更胖的效果
作者：
W. Coulton;R. Armstrong;Kendrick M. Smith;R. Lupton;D. Spergel
较亮-较胖的效应被假定是由于横向电场的建立而产生的，该横向电场是在像素的势威尔斯中积累光电荷时产生的。我们调查的超Suprime-Cam通过检查平坦的领域和恒星的时刻，更亮，更胖的效果。我们观察到偏离预期的线性关系的光子传输曲线（PTC），亮度相关的平场图像中的像素之间的相关性，和亮度相关的点扩散函数（PSF）在恒星观测。在平移不变性和准静态极限下的麦克斯韦方程组的关键假设下，我们给出了第一性原理证明，该效应可以参数化的一个几何不变的标量核。我们描述了这个内核可以从平坦的领域进行估计，并讨论了如何使用这个内核已被用来消除超Suprime-Cam图像中的较亮，较胖的失真。我们发现，我们的校正恢复预期的线性关系的PTC和显着减少，但不完全删除，在很宽的幅度范围内的PSF的光度依赖性。
The brighter-fatter effect has been postulated to arise due to the build up of a transverse electric field, produced as photocharges accumulate in the pixels’ potential wells. We investigate the brighter-fatter effect in the Hyper Suprime-Cam by examining flat fields and moments of stars. We observe deviations from the expected linear relation in the photon transfer curve (PTC), luminosity-dependent correlations between pixels in flat-field images, and a luminosity-dependent point-spread function (PSF) in stellar observations. Under the key assumptions of translation invariance and Maxwell’s equations in the quasi-static limit, we give a first-principles proof that the effect can be parameterized by a translationally invariant scalar kernel. We describe how this kernel can be estimated from flat fields and discuss how this kernel has been used to remove the brighter-fatter distortions in Hyper Suprime-Cam images. We find that our correction restores the expected linear relation in the PTCs and significantly reduces, but does not completely remove, the luminosity dependence of the PSF over a wide range of magnitudes.