论文标题
一个可观察到的宇宙剪切的新的
A new observable for cosmic shear
论文作者
论文摘要
在本文中，我们引入了一个可观察到的新的，以测量宇宙剪切。我们表明，如果我们能够以良好的精度测量星系的方向以及其无线电发射的极化方向，则它们之间的角度对前景宇宙剪切敏感。即使预计单个测量值的信噪比相当小，给定像素中的所有星系都可以使用相同的剪切剂来克服噪声。该可观察到的另一个优点是信号不会被固有比对困扰。我们估计以这种方式测量的剪切相关函数的SNR通过未来的SKA II调查来测量。
In this paper we introduce a new observable to measure cosmic shear. We show that if we can measure with good accuracy both, the orientation of a galaxy and the polarisation direction of its radio emission, the angle between them is sensitive to the foreground cosmic shear. Even if the signal-to-noise ratio for a single measurement is expected to be rather small, the fact that all galaxies in a given pixel are subject to the same shear can be used to overcome the noise. An additional advantage of this observable is that the signal is not plagued by intrinsic alignment. We estimate the SNR for the shear correlation functions measured in this way with the future SKA II survey.
