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arXiv 1005.4288astro-ph.CO
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CMB弱透镜收敛的实空间估计

Real space estimator for the weak lensing convergence from the CMB

C. S. Carvalho, K. Moodley

摘要:

我们提出了一个定义在实空间中的估计重建弱透镜势由于干预的大尺度结构从高分辨率的宇宙微波背景的地图。这个估计的动机是作为一种替代的二次估计在调和空间中,以超越的困难,分析包含银河切割和点源切除的地图。使用像素重映射合成的地图,我们实现了两个实验,即一个在没有和一个在检测器噪声的存在下,估计,并比较重建的收敛场与谐波空间中定义的二次估计得到的。我们发现很好的协议之间的输入和重建的功率谱使用建议的实空间估计。我们讨论有趣的功能,真正的空间估计和未来的扩展这项工作。

英文摘要:

We propose an estimator defined in real space for the reconstruction of the weak lensing potential due to the intervening large scale structure from high resolution maps of the cosmic microwave background. This estimator was motivated as an alternative to the quadratic estimator in harmonic space to surpass the difficulties of the analysis of maps containing galactic cuts and point source excisions. Using maps synthesised by pixel remapping, we implement the estimator for two experiments, namely one in the absence and one in the presence of detector noise, and compare the reconstruction of the convergence field with that obtained with the quadratic estimator defined in harmonic space. We find good agreement between the input and the reconstructed power spectra using the proposed real space estimator. We discuss interesting features of the real space estimator and future extensions of this work.

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