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
复制标题
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
复制
发表时间:
2013
影响因子:
4.8
通讯作者:
Antonik M
中科院分区:
文献类型:
--
作者:
Antonik M
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.
登录
查看更多内容
DOI:
10.1117/12.926216
发表时间:
2012
期刊:
--
影响因子:
--
作者:
Flaugher B
通讯作者:
Flaugher B
DOI:
--
发表时间:
2006
期刊:
SPIE Astronomical Telescopes + Instrumentation
影响因子:
--
作者:
S. Kent;R. Bernstein;T. Abbott;B. Bigelow;D. Brooks;P. Doel;B. Flaugher;M. Gladders;A. Walker;S. Worswick
通讯作者:
S. Worswick
DOI:
10.1117/12.825869
发表时间:
2009
期刊:
--
影响因子:
--
作者:
Antonik M
通讯作者:
Antonik M
DOI:
10.1111/j.1365-2966.2006.11315.x
发表时间:
2006-08
影响因子:
4.8
作者:
R. Massey;C. Heymans;J. Bergé;G. Bernstein;S. Bridle;D. Clowe;H. Dahle;R. Ellis;T. Erben
通讯作者:
R. Massey;C. Heymans;J. Bergé;G. Bernstein;S. Bridle;D. Clowe;H. Dahle;R. Ellis;T. Erben
DOI:
10.1111/j.1365-2966.2010.16461.x
发表时间:
2010-01
影响因子:
4.8
作者:
E. Cypriano;A. Amara;L. Voigt;S. Bridle;F. Abdalla;A. Réfrégier;M. Seiffert;J. Rhodes
通讯作者:
E. Cypriano;A. Amara;L. Voigt;S. Bridle;F. Abdalla;A. Réfrégier;M. Seiffert;J. Rhodes