基于HSC Y3与SDSS的点质量修正模型与红移自标定模型拟合星系聚类与全息星系-星系引力透镜
摘要
星系-星系弱引力和星系聚类的组合是探测宇宙学模型的强大工具，而探索如何最佳建模和从信号中提取信息至关重要。我们present了使用SDSS DR11光谱星系作为lens星系，并将HSC Y3剪切目录作为source星系，按其光学红移分为四个tomographic bin来测量星系-星系弱引力信号的measurement。SDSS DR11星系的红移范围为0.15<z<0.7，分为三个红移bin，作为测量投影相关函数wp(Rp)的探针。我们测量了12个lens-source bin配对的星系-星系引力信号Delta Sigma(Rp)，并指出在进行null testing后，测量中未发现显著的系统偏差。我们将wp(Rp)和Delta Sigma(Rp)（2×2pt）data vectors组合起来，并以平坦LambdaCDM模型进行似然推断。对于Delta Sigma(Rp)，我们在以往HSC Y3分析中 extending the lower limit of scale cut to 2 h^{-1}Mpc，通过 including a point-mass correction term in addition to the minimal bias model。我们present了various tests to validate our model and provide extended consistency tests. In the LambdaCDM context, our fiducial model yields S8 = 0.804^{+0.051}_{-0.051}。The 2×2pt data vector provides redshift parameter constraints for the third and fourth redshift bins Delta z3 = -0.079^{+0.074}_{-0.084}，and Delta z4 = -0.203^{+0.167}_{-0.206}，which is consistent with results from the previous tomographic cosmic shear studies, and serves as the foundation for a future 3×2pt analysis。
引用
@article{arxiv.2507.01377,
title = {Modelling Galaxy Clustering and Tomographic Galaxy-Galaxy Lensing with HSC Y3 and SDSS using the Point-Mass Correction Model and Redshift Self-Calibration},
author = {Tianqing Zhang and Sunao Sugiyama and Surhud More and Rachel Mandelbaum and Xiangchong Li and Roohi Dalal and Hironao Miyatake and Arun Kannawadi and Atsushi J. Nishizawa and Takahiro Nishimichi and Masamune Oguri and Ken Osato and Markus M. Rau and Masato Shirasaki and Tomomi Sunayama and Masahiro Takada},
journal= {arXiv preprint arXiv:2507.01377},
year = {2025}
}
备注
30 pages and 14 figures, comments welcome!