中文

DESI 2024 BAO 的综合轨迹分析

宇宙学与河外天体物理 2026-04-28 v2

摘要

本文展示了暗能量光谱仪器(DESI)数据发布 1(DR1)及未来碰撞声波振荡(BAO)分析如何 optimally 组合同一红移范围内的重叠轨迹(不同类型的星系)。我们制作了 Luminous Red Galaxies(LRGs)和 Emission Line Galaxies(ELGs)在红移范围 0.8 < z < 1.1 的统一目录,并研究其对 BAO 约束的影响。DESI DR1 包含约 30% 的最终 DESI LRG 样本和不足 25% 的最终 ELG 样本,LRGs 和 ELGs 的组合增加了 number density 并降低了 shot noise。我们开发了一条用于合并重叠轨迹的管道,采用星系偏差作为 approximately optimal weight,并在 Abacus 模拟套件上进行测试,在 DESI 早期数据发布的最终版本上进行校准。当将我们的管道应用于 DESI DR1 目录时,我们发现 BAO 约束对 αiso\alpha_\mathrm{iso} 提升 11%,对 αAP\alpha_\mathrm{AP} 提升约 7.0%,这与我们在 mock catalog 中的发现一致。我们的分析被整合到 DESI DR1 BAO 分析中,用于生成 0.8 < z < 1.1 红移 bin 的 LRG+ELG 结果,该结果提供了 DESI DR1 最精确的 BAO 测量,给出 0.86% 的 BAO 距离尺度约束和 9.1σ\sigma 的各向同性 BAO 特征检测。

关键词

引用

@article{arxiv.2508.05467,
  title  = {Combined tracer analysis for DESI 2024 BAO},
  author = {D. Valcin and M. Rashkovetskyi and H. Seo and F. Beutler and P. McDonald and A. de Mattia and A. J. Rosado-Marín and A. J. Ross and N. Padmanabhan and J. Aguilar and S. Ahlen and U. Andrade and D. Bianchi and D. Brooks and E. Chaussidon and S. Chen and X. Chen and T. Claybaugh and A. Cuceu and K. S. Dawson and A. de la Macorra and Biprateep Dey and Z. Ding and P. Doel and S. Ferraro and A. Font-Ribera and J. E. Forero-Romero and E. Gaztañaga and S. Gontcho A Gontcho and G. Gutierrez and C. Hahn and K. Honscheid and C. Howlett and M. Ishak and R. Kehoe and D. Kirkby and T. Kisner and A. Kremin and O. Lahav and A. Lambert and M. Landriau and M. E. Levi and M. Manera and A. Meisner and J. Mena-Fernández and R. Miquel and J. Moustakas and S. Nadathur and E. Paillas and N. Palanque-Delabrouille and W. J. Percival and F. Prada and I. Pérez-Ràfols and G. Rossi and R. Ruggeri and L. Samushia and E. Sanchez and C. Saulder and D. Schlegel and M. Schubnell and J. Silber and D. Sprayberry and G. Tarlé and B. A. Weaver and J. Yu and R. Zhou and H. Zou},
  journal= {arXiv preprint arXiv:2508.05467},
  year   = {2026}
}

备注

This DESI Publication is part of the 2024 series using the first year of observations (see https://data.desi.lbl.gov/doc/papers/). 36 pages, 9 figures