The impact of camera optical alignments on weak lensing measures for the Dark Energy Survey

The impact of camera optical alignments on weak lensing measures for the Dark Energy Survey
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相机光学对准对暗能量巡天弱透镜测量的影响

DOI:
10.1093/mnras/stt408
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发表时间:
2013
影响因子:
4.8
通讯作者:
Antonik M
Antonik M
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Antonik M

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望远镜点扩展函数(PSF)质量对于实现宇宙弱透镜观测约束暗能量和检验广义相对论的潜力至关重要。在本文中,我们使用定量弱引力透镜测量来告知透镜光学对准的精度,具体参考暗能量调查(DES)。我们计算了光学光斑图,并计算了PSF的剪切和弯曲作为焦平面上位置的函数。为了实现完美的光学对准,我们验证了DES光学设计的高质量,发现焦平面边缘附近弱透镜剪切的最大PSF贡献为0.04。然而,如果透镜只是在其最大规定公差范围内对齐,则可以增加约3倍。我们计算E和b模式的剪切和弯曲方差作为每个透镜的偏心或倾斜的函数。我们发现倾斜精度比分散精度重要几倍,这取决于所考虑的镜头。最后,我们考虑了多个透镜同时偏心和倾斜的复合效应,从每个参数的合理范围内采样。我们发现,复合效应的危害大约是单独使用任何一个镜头时的两倍。此外,这种综合效应改变了关于哪个透镜对准确对准最重要的结论。对于DES,前两个透镜的倾斜是最重要的。
Telescope point spread function (PSF) quality is critical for realizing the potential of cosmic weak lensing observations to constrain dark energy and test general relativity. In this paper, we use quantitative weak gravitational lensing measures to inform the precision of lens optical alignment, with specific reference to the Dark Energy Survey (DES). We compute optics spot diagrams and calculate the shear and flexion of the PSF as a function of position on the focal plane. For perfect optical alignment, we verify the high quality of the DES optical design, finding a maximum PSF contribution to the weak lensing shear of 0.04 near the edge of the focal plane. However, this can be increased by a factor of approximately 3 if the lenses are only just aligned within their maximum specified tolerances. We calculate the E- and B-mode shear and flexion variance as a function of the decentre or tilt of each lens in turn. We find tilt accuracy to be a few times more important than decentre, depending on the lens considered. Finally, we consider the compound effect of decentre and tilt of multiple lenses simultaneously, by sampling from a plausible range of values of each parameter. We find that the compound effect can be around twice as detrimental as when considering any one lens alone. Furthermore, this combined effect changes the conclusions about which lens is most important to align accurately. For DES, the tilt of the first two lenses is the most important.
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