Astrophysical systematics in Kinematic Lensing: quantifying an Intrinsic Alignment analog
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866917858510897152 |
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| author | Huang, Yu-Hsiu Krause, Elisabeth Xu, Jiachuan Eifler, Tim S., Pranjal R. Huff, Eric |
| author_facet | Huang, Yu-Hsiu Krause, Elisabeth Xu, Jiachuan Eifler, Tim S., Pranjal R. Huff, Eric |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_00197 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Astrophysical systematics in Kinematic Lensing: quantifying an Intrinsic Alignment analog Huang, Yu-Hsiu Krause, Elisabeth Xu, Jiachuan Eifler, Tim S., Pranjal R. Huff, Eric Cosmology and Nongalactic Astrophysics 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. |
| title | Astrophysical systematics in Kinematic Lensing: quantifying an Intrinsic Alignment analog |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2404.00197 |