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Verifications of scaling relations useful for the intrinsic alignment self-calibration

The galaxy intrinsic alignment (IA) is a major challenge of weak lensing cosmology. To alleviate this problem, Zhang (2010, MNRAS, 406, L95) proposed a self-calibration method, independent of IA modeling. This proposal relies on several scaling relations between two-point clustering of IA and matter...

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Bibliographic Details
Published in:arXiv.org 2018-08
Main Authors: Xian-guang Meng, Yu, Yu, Zhang, Pengjie, Jing, Yipeng
Format: Article
Language:English
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Summary:The galaxy intrinsic alignment (IA) is a major challenge of weak lensing cosmology. To alleviate this problem, Zhang (2010, MNRAS, 406, L95) proposed a self-calibration method, independent of IA modeling. This proposal relies on several scaling relations between two-point clustering of IA and matter/galaxy fields, which were previously only tested with analytical IA models. In this paper, these relations are tested comprehensively with an \(N\)-body simulation of \(3072^3\) simulation particles and boxsize 600 \(h^{-1} \, \mathrm{Mpc}\). They are verified at the accuracy level of \(\mathcal{O}(1)\%\) over angular scales and source redshifts of interest. We further confirm that these scaling relations are generic, insensitive to halo mass, weighting in defining halo ellipticities, photo-\(z\) error, and misalignment between galaxy ellipticities and halo ellipticities. We also present and verify three new scaling relations on the B-mode IA. These results consolidate and complete the theory side of the proposed self-calibration technique.
ISSN:2331-8422
DOI:10.48550/arxiv.1805.03672