AI 中文总结
该研究利用BOSS与DESI Legacy数据，通过星系本征对齐的各向异性关联，联合约束宇宙学参数，降低了相关参数的不确定性，为光谱宇宙学提供了新的信息源。
AI 中文摘要
我们开展了首个从星系本征对齐（IA）中同时提取几何与动力学信息的联合宇宙学分析。利用与DESI Legacy成像巡天的星系形状测量交叉匹配的BOSS光谱数据，我们测量了红移范围0.43≤z≤0.7内的各向异性星系密度-本征椭率（GI）和本征椭率（II）关联，并将其自旋依赖的角结构分解为关联勒让德多极矩。测得的GI关联呈现出预期的重子声学振荡（BAO）结构，而其各向异性提供了与星系成团互补的几何信息。通过联合建模红移空间和Alcock-Paczynski畸变，我们约束了增长速率参数fσ₈、角直径距离D_A和哈勃膨胀率H。与仅用星系成团相比，加入IA分别将它们的分数不确定性降低了32%、18%和29%。通过将这些约束映射到平坦w₀CDM模型，IA还收紧了对w₀、Ωₘ和H₀的约束；不过，w₀的约束对分析中包含的最小尺度敏感。我们的结果确立了各向异性星系形状作为光谱宇宙学的额外几何与动力学信息源的地位。
英文摘要
We present the first joint cosmological analysis to extract both geometric and dynamical information from galaxy intrinsic alignments (IAs). Using BOSS spectroscopy cross-matched with galaxy shape measurements from the DESI Legacy Imaging Surveys, we measure anisotropic galaxy density--intrinsic ellipticity (GI) and intrinsic ellipticity (II) correlations over $0.43\leq z\leq0.7$ and decompose their spin-dependent angular structure into associated Legendre multipoles. The measured GI correlation exhibits the expected baryon acoustic oscillation (BAO) structure, while its anisotropy provides geometric information complementary to galaxy clustering. By jointly modeling redshift-space and Alcock-Paczynski distortions, we constrain the growth rate parameter $fσ_8$, the angular-diameter distance $D_A$, and the Hubble expansion rate $H$. Relative to galaxy clustering alone, adding IA reduces their fractional uncertainties by 32\%, 18\%, and 29\%, respectively. By mapping these constraints onto a flat $w_0$CDM model, IA also tightens the constraints on $w_0$, $Ω_m$, and $H_0$; however, the $w_0$ constraint is sensitive to the minimum scale included in the analysis. Our results establish anisotropic galaxy shapes as an additional source of geometric and dynamical information for spectroscopic cosmology.
Comments10 pages, 6 figures, 1 table
