来自莱曼-$\alpha$ 森林的弱引力透镜测量
Weak Lensing Measurements from the Lyman-$α$ Forest
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中文总结 AI 辅助
利用DESI和BOSS数据构建二次估计量投影到偏折模板，测量莱曼-$\alpha$ 森林弱透镜振幅，结果为 $A_L=0.62\pm0.33$，与预测和无透镜均一致。
中文摘要 AI 辅助
我们尝试通过将基于DESI DR1数据构建的森林-森林和类星体-森林对相关函数的二次估计量，投影到由DESI和BOSS的低红移星系和类星体构建的偏折模板上，来测量莱曼-$\alpha$ 森林的弱引力透镜效应。在针对ACT DR6和Planck PR4 CMB透镜图验证了偏折模板，并用注入位移测试了估计量之后，我们在数据上测量了透镜振幅 $A_L$。与文献中的预测一致，当前一代的公开数据没有足够的信噪比来明确测量这一效应：我们从森林自相关得到透镜振幅 $A_L=0.42\pm0.43$，从类星体-森林互相关得到 $0.87\pm0.48$。这两个几乎独立的测量合并为 $A_L=0.62\pm0.33$，与基准值 $A_L=1$ 和无透镜两种情况均一致。
英文摘要
We attempt to measure the weak lensing of the Lyman-$α$ forest by projecting a quadratic estimator of the forest-forest and quasar-forest pair correlations, built from the DESI DR1 data, onto deflection templates constructed from low-redshift galaxies and quasars from DESI and BOSS. After validating deflection templates against the ACT DR6 and Planck PR4 CMB lensing maps and testing the estimator with injected displacements we measure the lensing amplitude $A_L$ on the data. Consistent with predictions in the literature, the current generation of public data does not have sufficient signal-to-noise to measure this effect unequivocally: we find the lensing amplitude $A_L=0.42\pm0.43$ from the forest auto-correlation and $0.87\pm0.48$ from the quasar--forest cross-correlation. These two nearly independent measurements combine to $A_L=0.62\pm0.33$, consistent with both the fiducial value $A_L=1$ and with no lensing.
发表机构
- Physics Department, Brookhaven National Laboratory（布鲁克海文国家实验室物理系）
机构由 AI 辅助整理，请以论文原文为准。
