Astrophysical systematics in Kinematic Lensing: quantifying an Intrinsic Alignment analog

Abstract

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.

12 pages, 5 figures, published in PRD

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Cited by in corpus (2)

• A rising tide: Intrinsic alignments since the turn of the millennium
• Kinematic Lensing Inference II: Cluster Lensing with $\mathcal{O}$(1) Galaxies