Kinematic lensing (KL) is a new weak lensing technique that reduces shape noise for disk galaxies by including spectroscopically measured galaxy kinematics in addition to photometrically measured galaxy shapes. Since KL utilizes the Tully-Fisher relation, any correlation of this relation with the local environment may bias the cosmological interpretation. For the first time, we explore such a Tully-Fisher environmental dependence (TED) effect as a potential astrophysical systematic for KL. Our derivation of the TED systematic can be described in a similar analytical form as intrinsic alignment for traditional weak lensing. We demonstrate analytically that TED only impacts KL if intrinsic aligment for disk galaxies is non-zero. We further use IllustrisTNG simulations to quantify the TED effect. Our two-point correlation measurements do not yield any additional coherent signals that would indicate a systematic bias on KL, within the uncertainties set by the simulation volume.
Cite
@article{arxiv.2404.00197,
title = {Astrophysical systematics in Kinematic Lensing: quantifying an Intrinsic Alignment analog},
author = {Yu-Hsiu Huang and Elisabeth Krause and Jiachuan Xu and Tim Eifler and Pranjal R. S. and Eric Huff},
journal= {arXiv preprint arXiv:2404.00197},
year = {2024}
}