Details

Autor(en) / Beteiligte

• Meng, Xian-guang
• Yu, Yu
• Zhang, Pengjie
• Jing, Yipeng

Titel

Verifications of Scaling Relations Useful for the Intrinsic Alignment Self-calibration

Ist Teil von

• The Astrophysical journal, 2018-09, Vol.864 (1), p.1

Ort / Verlag

Philadelphia: The American Astronomical Society

Erscheinungsjahr

2018

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• The galaxy intrinsic alignment (IA) is a major challenge of weak lensing cosmology. To alleviate this problem, Zhang 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 30723 simulation particles and boxsize 600h−1 Mpc. They are verified at the accuracy level of 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.