銀河団重力レンズ効果とCMB重力レンズ効果との相関によるニュートリノ質量への制限

星系团引力透镜效应和宇宙微波背景引力透镜效应之间的相关性对中微子质量的限制

• 批准号: 19J22222
• 负责人: LI Xiangchong
• 金额: $ 1.6万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2019
• 资助国家: 日本
• 起止时间: 2019-04-25 至 2022-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19J22222/
• 关键词: gravitational lensing; cosmology observations; image processing; galaxy clusters; observational cosmology; Weak lensing; Galaxy Shape Measurement; Mass map reconstruction; Hyper Suprime-Cam

I analytically developed an improved version of the Fourier Power Function Shapelets (FPFS) algorithm for accurate and fast shear estimation. The method now includes analytic corrections for sources of bias that plague all shape measurement algorithms: including noise bias (due to noise in nonlinear combinations of observable quantities) and selection bias (due to sheared galaxies being more or less likely to be detected). Crucially, these analytic solutions do not rely on calibration from external image simulations. For isolated galaxies, the small residual less than 0.001 multiplicative bias and less than 0.0001 additive bias now meet science requirements for Stage IV experiments. FPFS also works accurately for faint galaxies and robustly against stellar contamination.I conducted several systematic null tests for the HSC three-year cosmic shear measurement. One is to test the systematics in cosmic shear measurement caused by model residuals of point spread function due to diffraction of telescope and atmosphere. I cross-correlate galaxy shape with star shape to detect the PSF modelling residual in the galaxy shapes. The other null test is to check the B-mode systematics in the weak-lensing science. Then I looked into the influence of baryonic effect, the influence of the intrinsic alignment in the cosmic shear measurement. I have built up the analysis pipeline for HSC three year weak lensing cosmological constraints.

我在分析上开发了改进的傅立叶功率功能形状（FPFS）算法的改进版本，以进行准确且快速的剪切估计。现在，该方法包括困扰所有形状测量算法的偏差来源的分析校正：包括噪声偏置（由于可观察量的非线性组合中的噪声，由于剪切的星系或多或少被检测到了剪切的偏差）。至关重要的是，这些分析解决方案不依赖外部图像模拟的校准。对于孤立的星系，小于0.001乘偏置和小于0.0001添加偏置的小残留物现在符合第四阶段实验的科学要求。 FPF还可以准确地适用于微弱的星系，并针对恒星污染。一种是测试由于望远镜和大气的衍射引起的点扩散功能的模型残差引起的宇宙剪切测量的系统学。我用星形横断出星系形状，以检测星系形状中的psf模型。另一个无效测试是检查弱镜科学中的B模式系统。然后，我研究了宇宙剪切测量中固有比对的影响的影响。我已经建立了HSC三年弱镜头宇宙学限制的分析管道。

项目成果

Weak gravitational lensing shear measurement with FPFS: analytical mitigation of noise bias and selection bias

使用 FPFS 进行弱引力透镜剪切测量：噪声偏差和选择偏差的分析缓解

• DOI: 10.1093/mnras/stac342
• 发表时间: 2022
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Li Xiangchong;Li Yin;Massey Richard
• 通讯作者: Massey Richard

A comparative study of satellite galaxies in Milky Way-like galaxies from HSC, DECaLS, and SDSS

• DOI: 10.1093/mnras/staa3495
• 发表时间: 2020-09
• 期刊: arXiv: Astrophysics of Galaxies
• 作者: Wenting Wang;M. Takada;Xiangchong Li;S. Carlsten;Ting-Wen Lan;Jingjing Shi;H. Miyatake;S. More-S.-Mor

The three-year shear catalog of the Subaru Hyper Suprime-Cam SSP Survey

Subaru Hyper Suprime-Cam SSP 测量的三年剪切目录

• DOI: 10.1093/pasj/psac006
• 发表时间: 2022
• 期刊: Publications of the Astronomical Society of Japan
• 影响因子: 2.3
• 作者: Li Xiangchong;Miyatake Hironao;Luo Wentao;More Surhud;Oguri Masamune;Hamana Takashi;Mandelbaum Rachel;Shirasaki Masato;Takada Masahiro;Armstrong Robert;Kannawadi Arun;Takita Satoshi;Miyazaki Satoshi;Nishizawa Atsushi J;Plazas Malagon Andres A;Strauss Mich
• 通讯作者: Strauss Mich

Three-dimensional Reconstruction of Weak-lensing Mass Maps with a Sparsity Prior. I. Cluster Detection

• DOI: 10.3847/1538-4357/ac0625
• 发表时间: 2021-02
• 期刊: The Astrophysical Journal
• 作者: Xiangchong Li;N. Yoshida;M. Oguri;Shiro Ikeda;Wentao Luo

Fourier Power Function Shapelets (FPFS) Shear Estimator - Application to Hyper Suprime-Cam Survey

傅里叶幂函数 Shapelet (FPFS) 剪切估计器 - 在 Hyper Suprime-Cam 测量中的应用

• 发表时间: 2020
• 作者: Zhang Jun;Dong Fuyu;Li Hekun;Li Xiangchong;Li Yingke;Liu Dezi;Luo Wentao;Fu Liping;Li Guoliang;Fan Zuhui;Xiangchong Li
• 通讯作者: Xiangchong Li