Weak lensing measurements in simulations of radio images
Weak lensing measurements in simulations of radio images
复制标题
射电图像模拟中的弱透镜测量
DOI：
10.1093/mnras/stu1588
复制
发表时间：
2013
影响因子：
4.8
通讯作者：
R. Beswick
中科院分区：
文献类型：
--
作者：
P. Patel;F. Abdalla;D. Bacon;B. Rowe;O. Smirnov;R. Beswick
我们提出了一个研究弱透镜剪切测量模拟星系图像在无线电波长。我们构建了一个模拟管道，我们可以输入已知shapelet椭圆率的星系图像，然后我们用eMERLIN和国际LOFAR阵列模拟观测。模拟包括CLEAN算法，紫外采样，观察角度和可见度噪声的影响，并产生逼真的恢复图像的星系。我们应用基于shapelet的剪切测量方法，这些图像和测试我们的能力，以恢复真正的源shapelet椭圆。我们的模型和反卷积的有效点扩散函数，并找到合适的参数CLEAN和shapelet分解的星系。我们表明，椭圆度可以忠实地测量在这些无线电模拟，没有证据的添加剂的偏见和适度的（10%）乘法偏差的椭圆度测量。我们的模拟管道可用于测试下一代射电望远镜的剪切测量程序和系统。
We present a study of weak lensing shear measurements for simulated galaxy images at radio wavelengths. We construct a simulation pipeline into which we can input galaxy images of known shapelet ellipticity, and with which we then simulate observations with eMERLIN and the international LOFAR array. The simulations include the effects of the CLEAN algorithm, uv sampling, observing angle and visibility noise, and produce realistic restored images of the galaxies. We apply a shapelet-based shear measurement method to these images and test our ability to recover the true source shapelet ellipticities. We model and deconvolve the effective point spread function, and find suitable parameters for CLEAN and shapelet decomposition of galaxies. We demonstrate that ellipticities can be measured faithfully in these radio simulations, with no evidence of an additive bias and a modest (10 per cent) multiplicative bias on the ellipticity measurements. Our simulation pipeline can be used to test shear measurement procedures and systematics for the next generation of radio telescopes.
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.1365-2966.2006.10198.x
发表时间：
2006-05-21
影响因子：
4.8
作者：
Heymans, C;Van Waerbeke, L;Wittman, D
通讯作者：
Wittman, D