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arXiv · 2510.18011

Cosmic shear with one component and its application to future radio surveys

Yu-Hsiu Huang·Elisabeth Krause·Tim Eifler·Gary Bernstein·Jiachuan Xu·Eric Huff·Pranjal R. S
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Abstract

We present a new approach to measuring cosmic shear: the one-component kinematic lensing (KL) method. This technique provides a simplified implementation of KL that reduces shape noise in weak lensing (WL) by combining kinematic information with imaging data, while requiring less observational effort than the full two-component KL. We perform simulated likelihood analyses to assess the performance of the one-component KL and demonstrate its applicability to future radio surveys. Our forecasts indicate that, for radio surveys, the one-component KL is not yet competitive with traditional WL due to the shallow redshift distribution of Hi-selected galaxies. However, when applying this method to deeper spectroscopic surveys with stronger emission lines, the one-component KL approach could surpass WL in constraining power, offering a promising and efficient pathway for future shear analyses.

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Yu-Hsiu Huang, Elisabeth Krause, Tim Eifler, Gary Bernstein, Jiachuan Xu, Eric Huff, Pranjal R. S. 2025-10-20. Cosmic shear with one component and its application to future radio surveys. https://doi.org/10.1103/bfx7-4fsw

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