未解决伽马射线背景与大尺度宇宙结构之间的高度显著相关性检测
宇宙学与河外天体物理
2025-07-02 v2 高能天体物理现象
摘要
尽管过去十年我们对 -射线天空的了解有着显著提升，未解决的 -射线背景 (UGRB) 仍潜在包含关于遍布宇宙中最微弱 -射线源的大量信息。统计上与宇宙结构的轨迹进行交叉相关，可间接识别最能特征化 -射线背景的物质分布。本研究中，我们分析了 -射线背景与宇宙中物质分布之间的角相关性，后者通过引力透镜效应被追踪。我们利用来自 Fermi-Large Area Telescope (LAT) 的十余年观测数据和来自 Dark Energy Survey (DES) 的三年数据，我们检测到了信号信噪比为 8.9 的相关性。大部分统计显著性来自大尺度，首次显示 UGRB 的显著部分与弱透镜所追踪的宇宙质量聚集相吻合。Blazar 能为解释这一信号提供合理解释，尤其是如果贡献于相关性的 Blazar 位于大质量 () 的星系群中，并占据 UGRB 以上 10 GeV 的约 30-40%。此外，我们观察到偏好曲面 -射线能谱，log-抛物线形状被优于幂律。我们还讨论了 Blazar 模型的可能修改以及包括星形成星系或粒子暗物质等额外 -射线源的可能性。
引用
@article{arxiv.2501.10506,
title = {High-Significance Detection of Correlation Between the Unresolved Gamma-Ray Background and the Large Scale Cosmic Structure},
author = {B. Thakore and M. Negro and M. Regis and S. Camera and D. Gruen and N. Fornengo and A. Roodman and A. Porredon and T. Schutt and A. Cuoco and A. Alarcon and A. Amon and K. Bechtol and M. R. Becker and G. M. Bernstein and A. Campos and A. Carnero Rosell and M. Carrasco Kind and R. Cawthon and C. Chang and R. Chen and A. Choi and J. Cordero and C. Davis and J. DeRose and H. T. Diehl and S. Dodelson and C. Doux and A. Drlica-Wagner and K. Eckert and J. Elvin-Poole and S. Everett and A. Ferté and M. Gatti and G. Giannini and R. A. Gruendl and I. Harrison and W. G. Hartley and E. M. Huff and M. Jarvis and N. Kuropatkin and P. -F. Leget and N. MacCrann and J. McCullough and J. Myles and A. Navarro-Alsina and S. Pandey and J. Prat and M. Raveri and R. P. Rollins and A. J. Ross and E. S. Rykoff and C. Sánchez and L. F. Secco and I. Sevilla-Noarbe and E. Sheldon and T. Shin and M. A. Troxel and I. Tutusaus and B. Yanny and B. Yin and Y. Zhang and M. Aguena and D. Brooks and J. Carretero and L. N. da Costa and T. M. Davis and J. De Vicente and S. Desai and P. Doel and B. Flaugher and J. Frieman and J. García-Bellido and E. Gaztanaga and G. Gutierrez and S. R. Hinton and D. L. Hollowood and K. Honscheid and D. J. James and K. Kuehn and O. Lahav and S. Lee and M. Lima and J. L. Marshall and J. Mena-Fernández and R. Miquel and R. L. C. Ogando and A. Palmese and A. Pieres and A. A. Plazas Malagón and S. Samuroff and E. Sanchez and D. Sanchez Cid and M. Smith and E. Suchyta and G. Tarle and V. Vikram and A. R. Walker and N. Weaverdyck},
journal= {arXiv preprint arXiv:2501.10506},
year = {2025}
}
备注
34 pages, 15 figures