暗能量巡天第三年数据：蓝星系剪切
宇宙学与河外天体物理
2026-05-07 v1
摘要
星系内禀取向（IA）的建模对弱引力透镜分析构成挑战。当限定于蓝色、恒星形成星系时，暗能量巡天（DES）所受 IA 影响预计较小。与完整的 DES Y3 样本中的被动星系不同，来自该蓝星系宇宙剪切样本的宇宙学参数约束对 IA 模型选择是稳定的，拟合优度得到改善，且 和 与宇宙微波背景的一致性更好。通过样本选择而非灵活的模型选择来减轻 IA，可将 的不确定性降低 1.5 倍。
引用
@article{arxiv.2410.22272,
title = {Dark Energy Survey Year 3: Blue Shear},
author = {J. McCullough and A. Amon and E. Legnani and D. Gruen and A. Roodman and O. Friedrich and N. MacCrann and M. R. Becker and J. Myles and S. Dodelson and S. Samuroff and J. Blazek and J. Prat and K. Honscheid and A. Pieres and A. Ferté and A. Alarcon and A. Drlica-Wagner and A. Choi and A. Navarro-Alsina and A. Campos and A. A. Plazas Malagón and A. Porredon and A. Farahi and A. J. Ross and A. Carnero Rosell and B. Yin and B. Flaugher and B. Yanny and C. Sánchez and C. Chang and C. Davis and C. To and C. Doux and D. Brooks and D. J. James and D. Sanchez Cid and D. L. Hollowood and D. Huterer and E. S. Rykoff and E. Gaztanaga and E. M. Huff and E. Suchyta and E. Sheldon and E. Sanchez and F. Tarsitano and F. Andrade-Oliveira and F. J. Castander and G. M. Bernstein and G. Gutierrez and G. Giannini and G. Tarle and H. T. Diehl and H. Huang and I. Harrison and I. Sevilla-Noarbe and I. Tutusaus and I. Ferrero and J. Elvin-Poole and J. L. Marshall and J. Muir and J. Weller and J. Zuntz and J. Carretero and J. DeRose and J. Frieman and J. Cordero and J. De Vicente and J. García-Bellido and J. Mena-Fernández and K. Eckert and A. K. Romer and K. Bechtol and K. Herner and K. Kuehn and L. F. Secco and L. N. da Costa and M. Paterno and 21 M. Soares-Santos and M. Gatti and M. Raveri and M. Yamamoto and M. Smith and M. Carrasco Kind and M. A. Troxel and M. Aguena and M. Jarvis and M. E. C. Swanson and N. Weaverdyck and O. Lahav and P. Doel and P. Wiseman and R. Miquel and R. A. Gruendl and R. Cawthon and S. Allam and S. R. Hinton and S. L. Bridle and S. Bocquet and S. Desai and S. Pandey and S. Everett and S. Lee and T. Shin and A. Palmese and C. Conselice and D. L. Burke and E. Buckley-Geer and M. Lima and M. Vincenzi and M. E. S. Pereira and M. Crocce and M. Schubnell and N. Jeffrey and O. Alves and V. Vikram and Y. Zhang and DES Collaboration},
journal= {arXiv preprint arXiv:2410.22272},
year = {2026}
}
备注
Data access available at https://jamiemccullough.github.io/data/blueshear/