A new observable for cosmic shear
arXiv:2203.13634 · doi:10.1088/1475-7516/2022/09/003
Abstract
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.
Version accepted for publication in JCAP 21 pages, 3 figures, version 3
References in corpus (9)
- Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
- KiDS-1000 Cosmology: Cosmic shear constraints and comparison between two point statistics
- Dark Energy Survey Year 3 results: cosmological constraints from the analysis of cosmic shear in harmonic space
- Consistency of cosmic shear analyses in harmonic and real space
- SuperCLASS -- III. Weak lensing from radio and optical observations in Data Release 1
- Detection of Cosmic Magnification via Galaxy Shear -- Galaxy Number Density Correlation from HSC Survey Data
- A low frequency study of linear polarization in radio galaxies
- Image Rotation from weak Lensing
- An Estimator for the lensing potential from galaxy number counts